U.S. patent application number 17/305869 was filed with the patent office on 2022-03-31 for drilling machines and methods thereof.
This patent application is currently assigned to SICHUAN HONGHUA PETROLEUM EQUIPMENT CO., LTD.. The applicant listed for this patent is SICHUAN HONGHUA PETROLEUM EQUIPMENT CO., LTD.. Invention is credited to Chong CHEN, Hang GAO, Bo HE, Xiaohu LI, Zhigang LI, Yan LYU, Aimin TANG, Yu TIAN.
Application Number | 20220098938 17/305869 |
Document ID | / |
Family ID | 1000005771034 |
Filed Date | 2022-03-31 |
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United States Patent
Application |
20220098938 |
Kind Code |
A1 |
CHEN; Chong ; et
al. |
March 31, 2022 |
DRILLING MACHINES AND METHODS THEREOF
Abstract
The present disclosure discloses a drilling machine. The
drilling machine may include a base, a mast arranged on the base,
an iron roughneck, a drill floor mechanical arm, a top drive
arranged on the mast, a pipe racker on a finger board, a power
finger board, a power catwalk arranged on the ground, and an
elevator arranged on the top drive. The drill machine and a
corresponding tripping out and tripping in method may be used to
vertically transport a stand between a well center and a region of
at least one pipe setback efficiently, which may improve the
efficiency of tripping out and tripping in, and reduce the risk of
accidents in the well. In addition, the present disclosure provides
a corresponding method for offline connecting and disconnecting
stands during a drilling operation, which may reduce a preparation
time during the drilling, improve the drilling efficiency, and
reduce the cost of oilfield development.
Inventors: |
CHEN; Chong; (Guanghan,
CN) ; TIAN; Yu; (Guanghan, CN) ; TANG;
Aimin; (Guanghan, US) ; GAO; Hang; (Guanghan,
CN) ; LI; Zhigang; (Guanghan, CN) ; LYU;
Yan; (Guanghan, CN) ; HE; Bo; (Guanghan,
CN) ; LI; Xiaohu; (Guanghan, CN) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
SICHUAN HONGHUA PETROLEUM EQUIPMENT CO., LTD. |
Guanghan |
|
CN |
|
|
Assignee: |
SICHUAN HONGHUA PETROLEUM EQUIPMENT
CO., LTD.
Guanghan
CN
|
Family ID: |
1000005771034 |
Appl. No.: |
17/305869 |
Filed: |
July 16, 2021 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
E21B 19/155 20130101;
E21B 3/022 20200501; E21B 19/10 20130101; E21B 19/161 20130101;
E21B 19/165 20130101; E21B 19/07 20130101 |
International
Class: |
E21B 19/16 20060101
E21B019/16; E21B 19/07 20060101 E21B019/07; E21B 19/10 20060101
E21B019/10; E21B 19/15 20060101 E21B019/15; E21B 3/02 20060101
E21B003/02 |
Foreign Application Data
Date |
Code |
Application Number |
Sep 27, 2020 |
CN |
202011034814.9 |
Claims
1. A drilling machine, comprising: a base; a mast arranged on the
base; an iron roughneck; a power slip; a drill floor mechanical arm
arranged on the base; a top drive and a power finger board arranged
on the mast; a pipe racker on a finger board arranged on the power
finger board; and an elevator arranged on the top drive, wherein
the elevator is configured to tilt relative to a vertical
direction, a region of at least one pipe setback is disposed on a
region in an upper surface of the base vertically corresponding to
the power finger board, the pipe racker on the finger board
includes a clamp head and a transmission mechanism that moves the
clamp head, the clamp head being configured to clamp or support an
upper portion of a stand, the drill floor mechanical arm is
configured to clamp or support a lower portion of the stand and
coordinate with the clamp head to move the stand between a position
of a well center and the region of the at least one pipe setback,
and during the movement of the stand between the position of the
well center and the region of the at least one pipe setback, one of
the clamp head and the drill floor mechanical arm clamps the stand
and the other of the clamp head and the drill floor mechanical arm
supports the stand.
2. The drilling machine of claim 1, further comprising a
stand-connecting mechanical arm and a power catwalk, wherein the
stand-connecting mechanical arm is arranged on the mast and
configured to move up-and-down along the mast, clamping and driving
a pipe to move; and the power catwalk is arranged on the ground and
a mouse hole A and a mouse hole B that are disposed on the base,
the mouse hole A and the mouse hole B being positioned between the
at least one pipe setback and the well center.
3. The drilling machine of claim 2, wherein a thread grease doper
is arranged on the drilling machine.
4. The drilling machine of claim 1, wherein the drill floor
mechanical arm includes: a rail disposed on the base, the rail
being disposed between the at least one pipe setback to form an
L-shape; a traveling mechanism arranged on the rail; a string
arranged on the traveling mechanism; a telescopic mechanism
arranged on the string; and a guide clamp arranged on the
telescopic mechanism.
5. The drilling machine of claim 4, wherein the drilling machine
further includes a mouse hole A and a mouse hole B disposed on the
base, the mouse hole A and the mouse hole B being positioned
between the at least one pipe setback and the well center,
symmetrical to a center line of the rail.
6. A tripping out method using the drilling machine of claim 1,
comprising: step 1: placing the top drive at a low position,
opening the elevator to clamp a string of the well center, shutting
the elevator, and lifting the string of the well center upward;
step 2: turning off the power slip and placing the string on the
power slip after the top drive arrives at a high position; step 3:
extending the iron roughneck to the well center to break out, and
fixing an upper portion of the string via the elevator of the top
drive; step 4: retracting the iron roughneck, extending the pipe
racker on the finger board and the drill floor mechanical arm to
the well center, synchronously, opening the clamp head of the pipe
racker on the finger board to clamp or support an upper portion of
a stand, and opening a clamp head of the drill floor mechanical arm
to clamp or support a lower portion of the stand; step 5: opening
the elevator of the top drive, and tilting the elevator backward;
step 6: retracting, rotating, and moving the pipe racker on the
finger board and the drill floor mechanical arm, synchronously, to
transport the stand to the region of the at least one pipe setback,
the stand remaining vertical during the transportation of the
stand; step 7: lowering, by the pipe racker on the finger board or
the drill floor mechanical arm, the stand to the region of the at
least one pipe setback, opening and retracting the clamp head of
the pipe racker on the finger board and the clamp head of the drill
floor mechanical arm, synchronously; and step 8: moving, rotating,
or extending the pipe racker on the finger board and the drill
floor mechanical arm to a position close to the well center,
synchronously, to wait for clamping a next stand.
7. The method of claim 6, further comprising: during the steps 6-8,
after the stand is out of the well center, moving the top drive
downward to the low position to perform the step 1 and continue to
a next cycle.
8. A tripping in method of the drilling machine of claim 3,
comprising: step 1: clamping, by one of the pipe racker on the
finger board and the drill floor mechanical arm, and supporting, by
the other of the pipe racker on the finger board and the drill
floor mechanical arm, a stand to transport the stand to the
position of the well center, during the transportation of the
stand, the stand remaining vertical and the thread grease doper
being used to dope a thread grease; step 2: placing, by the pipe
racker on the finger board and the drill floor mechanical arm, the
stand on a top end of a lower string, lifting the stand by the
elevator, loosening the stand by the pipe racker on the finger
board and the drill floor mechanical arm, and moving the pipe
racker on the finger board and the drill floor mechanical arm to
the region of the at least one pipe setback to prepare to clamp a
next stand; step 3: extending the iron roughneck to the well center
to make up and resetting the iron roughneck; and step 4: lowering,
by the elevator, the stand to the lower position, turning off the
power slip, opening the elevator to tilt backward, and moving the
top drive upward.
9. The method of claim 8, wherein the thread grease doper is used
to dope the thread grease on a lower portion of the stand during
the transportation of the stand.
10. The method of claim 8, wherein the thread grease doper is used
to dope the thread grease on a top portion of the stand during the
transportation of the stand.
11. A method for connecting stands offline using the drilling
machine of claim 2, comprising: step 1: obliquely transporting a
first pipe to a drill floor via the power catwalk, clamping a front
portion of the first pipe using a clamp head of the
stand-connecting mechanical arm, carrying the first pipe to move
upward and adjusting the first pipe to vertical by the
stand-connecting mechanical arm, moving the clamp head of the
stand-connecting mechanical arm to a position right above the mouse
hole A, carrying the first pipe downward and placing the first pipe
into the mouse hole A by the stand-connecting mechanical arm; step
2: obliquely transporting a second pipe to the drill floor via the
power catwalk, clamping a front portion of the second pipe using
the clamp head of the stand-connecting mechanical arm, carrying the
second pipe to move upward and adjusting the second pipe to
vertical by the stand-connecting mechanical arm, moving the clamp
head of the stand-connecting mechanical arm to the position right
above the mouse hole A, carrying the second pipe downward, and
placing a connector at a lower portion of the second pipe into a
connector at an upper portion of the first pipe; step 3: extending
the iron roughneck to the mouse hole A to make up the first pipe
and the second pipe to form a double stand, retracting the iron
roughneck after making up the first pipe and the second pipe; step
4: clamping, by the stand-connecting mechanical arm, the double
stand to move upward until a connector at a lower portion of the
double stand leaves the drill floor, wherein a clamp head of the
drill floor mechanical arm supports the lower portion of the double
stand before the connector at the lower portion of the double stand
leaves the drill floor; step 5: clamping or supporting an upper
portion of the double stand by the pipe racker on the finger board,
opening the clamp head of the stand-connecting mechanical arm and
driving the clamp head of the stand-connecting mechanical arm to
move upward, clamping or supporting a lower portion of the double
stand by the drill floor mechanical arm; step 6: vertically
transporting, by the pipe racker on the finger board and the drill
floor mechanical arm, the double stand to the region of the at
least one pipe setback, synchronously; step 7: lowering, by the
pipe racker on the finger board or the drill floor mechanical arm,
the double stand to the region of the at least one pipe setback,
opening and retracting the clamp head of the pipe racker on the
finger board and a clamp head of the drill floor mechanical arm,
synchronously, returning the drill floor mechanical arm to a
storage region.
12. The method of claim 11, wherein when a plurality of pipes need
to be connected, the method further includes: repeating the steps
of claim 11 to circularly connect a next double stand offline.
13. The method of claim 11, wherein the drilling machine further
includes a thread grease doper, wherein the method further
comprises: during a process for connecting stands, the thread
grease doper is integrated into the iron roughneck or the drill
floor mechanical arm to dope a thread grease.
14. A method for connecting stands offline using the drilling
machine of claim 2, comprising: step 1: obliquely transporting a
first pipe to a drill floor via the power catwalk, clamping a front
portion of the first pipe using a clamp head of the
stand-connecting mechanical arm, carrying the first pipe to move
upward and adjusting the first pipe to vertical by the
stand-connecting mechanical arm, moving the clamp head of the
stand-connecting mechanical arm to a position right above the mouse
hole A, carrying the first pipe downward and placing the first pipe
into the mouse hole A by the stand-connecting mechanical arm; step
2: obliquely transporting a second pipe to the drill floor via the
power catwalk, clamping a front portion of the second pipe using
the clamp head of the stand-connecting mechanical arm, carrying the
second pipe to move upward and adjusting the second pipe to
vertical by the stand-connecting mechanical arm, moving the clamp
head of the stand-connecting mechanical arm to a position right
above the mouse hole B, carrying the second pipe downward, and
placing the second pipe into the mouse hole B by the
stand-connecting mechanical arm; step 3: obliquely transporting a
third pipe to the drill floor via the power catwalk, clamping a
front portion of the third pipe using the clamp head of the
stand-connecting mechanical arm, carrying the third pipe to move
upward and adjusting the third pipe to vertical by the
stand-connecting mechanical arm, moving the clamp head of the
stand-connecting mechanical arm to the position right above the
mouse hole A or the mouse hole B, carrying the third pipe downward,
and placing a connector at a lower portion of the third pipe into a
connector at an upper portion of the first pipe or the second pipe;
step 4: extending the iron roughneck to the mouse hole including
two pipes to make up the two pipes to form a double stand, and
retracting the iron roughneck after making up the two pipes; step
5: clamping, by the stand-connecting mechanical arm, the double
stand to move upward until a lower end of the double stand is
higher than the drill floor, synchronously moving the
stand-connecting mechanical arm to a position right above the other
pipe in the other mouse hole, and lowering the double stand until a
connector at the lower portion of the double stand is placed into a
connector at an upper portion of the other pipe, wherein a clamp
head of the drill floor mechanical arm supports the lower portion
of the double stand before the connector at the lower portion of
the double stand leaves the drill floor; step 6: extending the iron
roughneck to the mouse hole including three pipes to make up the
double stand and the other pipe to form a triple stand, retracting
the iron roughneck after making up the double stand and the other
pipe; step 7: clamping, by the stand-connecting mechanical arm, the
triple stand to move upward until a connector at a lower portion of
the triple stand leaves the drill floor, wherein the clamp head of
the drill floor mechanical arm supports the lower portion of the
triple stand before the connector at the lower portion of the
triple stand leaves the drill floor; step 8: clamping or supporting
an upper portion of the triple stand by the pipe racker on the
finger board, opening the clamp head of the stand-connecting
mechanical arm and driving the clamp head to move upward, clamping
or supporting a lower portion of the triple stand by the drill
floor mechanical arm; step 9: vertically transporting, by the pipe
racker on the finger board and the drill floor mechanical arm, the
triple stand to the region of the at least one pipe setback,
synchronously; step 10: lowering, by the pipe racker on the finger
board or the drill floor mechanical arm, the triple stand to the
region of the at least one pipe setback, opening and retracting the
clamp head of the pipe racker on the finger board and the clamp
head of the drill floor mechanical arm, synchronously, returning
the drill floor mechanical arm to a storage region.
15. The method of claim 14, wherein when a plurality of pipes need
to be connected, the method further comprises: repeating the steps
of claim 14 to circularly connect a next triple stand offline.
16. The method of claim 14, wherein the drilling machine further
includes a thread grease doper, wherein the method further
comprises: during a process for connecting stands, the thread
grease doper is integrated into the iron roughneck or the drill
floor mechanical arm to dope a thread grease.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] The present disclosure claims priority of Chinese
application No. 202011034814.9 filed on Sep. 27, 2020, the contents
of which are hereby incorporated by reference.
TECHNICAL FIELD
[0002] The present disclosure relates to devices and technology for
drilling and mining petroleum and natural gas, and in particular,
to efficient and offline drilling machines and methods for mining
petroleum and natural gas.
BACKGROUND
[0003] With the development of drilling technology, the design and
manufacturing of the drilling machine have been improved
significantly. The speed of the research and development (R&D)
has also been improved, and the direction of the R&D turns
toward serialization, standardization, and diversification.
Further, in recent years, the performance of the drilling machine
has been improved greatly. At the same time, with the complexity of
the on-site operation technology and operation processes, as well
as more and more attention to safety and efficiency, there is a
growing need for automation in the drilling operation. How to
ensure the safety, reliability, and efficiency of the entire
drilling system has become the key.
[0004] Nowadays, land drilling machines mainly use the following
process for drilling and processing pipes. First, special vehicles
transport a drilling machine to a well. An on-site crane is used to
lift pipes to a pipe arrangement. Then, the worker operates a power
catwalk to clamp a pipe from the pipe arrangement. The pipe is
moved to a drill floor via the power catwalk. Accordingly, a
driller operates a hydraulic elevator to clamp the pipe on the
drill floor and lift the pipe via a top drive. When a connector at
a lower portion of the pipe leaves the power catwalk, another
driller lowers the pipe into a well center via an auxiliary tool or
a drill floor righting mechanism. The another driller adjusts the
pipe to vertical at the well center. Finally, a new pipe is
connected with the pipe at the well center through an iron
roughneck on the drill floor. The above operations are completed by
the coordination of two or three workers. At the same time, during
a process for connecting pipes, the well center is occupied, so
that the drilling operation is inefficient and dangerous.
[0005] When tripping out at the well center, a string of the well
center is lifted to a high position by the top drive. The string of
the well center is placed on a slip. Accordingly, the iron
roughneck is extended to the well center to break out the string.
Then, a lower portion of a stand is arranged to a region of at
least one pipe setback through a driller or a drill floor
mechanical arm. Finally, an upper portion of the stand is
transported to a mast worker or a pipe racker on a finger board
through the top drive. The stand is arranged to the region of the
at least one pipe setback through the mast worker or the pipe
racker on the finger board. When the lower portion of the stand is
arranged to the region of the at least one pipe setback from the
well center, the stand always occupies a position of the well
center, which may reduce the efficiency of tripping out and
tripping in and increase the risk of accidents in the well. The
tripping in process is the inverse of the tripping out process,
which may have a similar problem.
[0006] According to commonly-accepted terms in the art, a drill rod
refers to a single drill rod. A stand refers to a relatively long
rod connected by a plurality of drill rods (e.g., 2 to 4 drill
rods). A string refers to a pipe connected by a plurality of drill
rods and placed in the well center. Alternatively, the string
refers to a combination of a drill rod and a drill collar. In some
embodiments, the string may include a plurality of sleeves.
According to a number (count) of connected drill rods, a length of
the string may be within a range from tens of meters to thousands
of meters. The stand may be a plurality of connected drill rods
separated from the string after breaking out.
SUMMARY
[0007] The purpose of the present disclosure is to overcome the
above shortcomings in the art. The present disclosure provides a
drill machine. The drill machine may be used to vertically
transport a stand between a well center and a region of at least
one pipe setback efficiently, which may improve the efficiency of
tripping out and tripping in, and reduce the risk of accidents in
the well. In addition, the present disclosure provides
corresponding methods for offline connecting and disconnecting
stands during a drilling operation, which may reduce a preparation
time during the drilling, improve the drilling efficiency, and
reduce the cost of oilfield development.
[0008] An aspect of the present disclosure relates to a drilling
machine. The drilling machine may include a base, a mast arranged
on the base, an iron roughneck, a power slip, a drill floor
mechanical arm arranged on the base, a top drive and a power finger
board arranged on the mast, a pipe racker on a finger board
arranged on the power finger board, and an elevator arranged on the
top drive. The elevator may be configured to tilt relative to a
vertical direction. A region of at least one pipe setback may be
disposed on a region in an upper surface of the base vertically
corresponding to the power finger boards. The pipe racker on the
finger board may include a clamp head and a transmission mechanism
that moves the clamp head. The clamp head may be configured to
clamp or support an upper portion of a stand. The drill floor
mechanical arm may be configured to clamp or support a lower
portion of the stand and coordinate with the clamp head to move the
stand between a position of a well center and the region of the at
least one pipe setback. One of the clamp head and the drill floor
mechanical arm may clamp the stand, and the other of the clamp head
and the drill floor mechanical arm may support the stand.
[0009] Another aspect of the present disclosure provides a tripping
out method. The method may include the following steps.
[0010] In step 1, a top drive may be placed at a low position. An
elevator may be opened to clamp a string of a well center. The
elevator may be shut. The string of the well center may be lifted
upward.
[0011] In step 2, a power slip may be turned off. The string may be
placed on the power slip after the top drive arrives at a high
position.
[0012] In step 3, an iron roughneck may be extended to the well
center to break out. An upper portion of the string may be fixed
via the elevator of the top drive.
[0013] In step 4, the iron roughneck may be retracted. A pipe
racker on a finger board and a drill floor mechanical arm may be
extended to the well center, synchronously. A clamp head of the
pipe racker on the finger board may be opened to clamp or support
an upper portion of a stand. A clamp head of the drill floor
mechanical arm may be opened to clamp or support a lower portion of
the stand.
[0014] In step 5, the elevator of the top drive may be opened. The
elevator may be tilted backward.
[0015] In step 6, the pipe racker on the finger board and the drill
floor mechanical arm may be retracted, rotated, and moved,
synchronously, to transport the stand to a region of at least one
pipe setback. The stand may remain vertical during the
transportation of the stand.
[0016] In step 7, the stand may be lowered to the region of the at
least one pipe setback by the pipe racker on the finger board or
the drill floor mechanical arm. The clamp head of the pipe racker
on the finger board and the clamp head of the drill floor
mechanical arm may be opened and retracted, synchronously.
[0017] In step 8, the pipe racker on the finger board and the drill
floor mechanical arm may be moved, rotated, or extended to a
position close to the well center, synchronously, to wait for
clamping a next stand.
[0018] In some embodiments, when a next stand needs to be tripped
out after the step 4 is finished, the top drive may be moved
downward to the low position to perform the step 1 and continue to
a next cycle after the stand is out of the well center during the
steps 6-8.
[0019] A further aspect of the present disclosure provides a
tripping in method. The method may include the following steps.
[0020] In step 1, a stand may be clamped, by one of a pipe racker
on a finger board and a drill floor mechanical arm, and supported,
by the other of the pipe racker on the finger board and the drill
floor mechanical arm, to transport the stand to a position of a
well center. During the transportation of the stand, the stand may
remain vertical and a thread grease doper may be used to dope a
thread grease.
[0021] In step 2, the stand may be placed, by the pipe racker on
the finger board and the drill floor mechanical arm, on a top end
of a lower string. The stand may be lifted by an elevator. The
stand may be loosened by the pipe racker on the finger board and
the drill floor mechanical arm. The pipe racker on the finger board
and the drill floor mechanical arm may be moved to a region of at
least one pipe setback to prepare to clamp a next stand.
[0022] In step 3, an iron roughneck may be extended to the well
center to make up. The iron roughneck may be reset after the making
up.
[0023] In step 4, the stand may be lowered, by the elevator, to the
lower position. The power slip may be turned off. The elevator may
be opened to tilt backward. The top drive may be moved upward.
[0024] When the tripping in of the drilling machine is continued,
the steps 1-4 may be repeated from the step 1. The step 4 may be
performed synchronously with the steps 1-2.
[0025] In some embodiments, using the thread grease doper to dope
the thread grease in step 1 may be doping the thread grease on a
lower portion of the stand during the transportation of the
stand.
[0026] A still further aspect of the present disclosure provides a
method for connecting stands offline. The method may include the
following steps.
[0027] In step 1, a first pipe may be obliquely transported to a
drill floor via a power catwalk. A front portion of the first pipe
may be clamped using a clamp head of a stand-connecting mechanical
arm. The first pipe may be carried to move upward and adjusted to
vertical by the stand-connecting mechanical arm. The clamp head of
the stand-connecting mechanical arm may be moved to a position
right above a mouse hole A. The first pipe may be carried downward
and placed into the mouse hole A by the stand-connecting mechanical
arm.
[0028] In step 2, a second pipe may be obliquely transported to the
drill floor via the power catwalk. A front portion of the second
pipe may be clamped using the clamp head of the stand-connecting
mechanical arm. The second pipe may be carried to move upward and
adjusted to vertical by the stand-connecting mechanical arm. The
clamp head of the stand-connecting mechanical arm may be moved to a
position right above a mouse hole B. The second pipe may be carried
downward and placed into the mouse hole B by the stand-connecting
mechanical arm.
[0029] In step 3, a third pipe may be obliquely transported to the
drill floor via the power catwalk. A front portion of the third
pipe may be clamped using the clamp head of the stand-connecting
mechanical arm. The third pipe may be carried to move upward and
adjusted to vertical by the stand-connecting mechanical arm. The
clamp head of the stand-connecting mechanical arm may be moved to
the position right above the mouse hole A or the mouse hole B. The
third pipe may be carried downward. A connector at a lower portion
of the third pipe may be placed into a connector at an upper
portion of the first pipe or the second pipe.
[0030] In step 4, an iron roughneck may be extended to the mouse
hole including two pipes to make up the two pipes to form a double
stand. The iron roughneck may be retracted after making up the two
pipes.
[0031] In step 5, the double stand may be clamped, by the
stand-connecting mechanical arm, to move upward until a lower end
of the double stand is higher than the drill floor. The
stand-connecting mechanical arm may be synchronously moved to a
position right above the other pipe in the other mouse hole. The
double stand may be lowered downward until a connector at the lower
portion of the double stand is placed into a connector at an upper
portion of the other pipe. A clamp head of a drill floor mechanical
arm may support the lower portion of the double stand before the
connector at the lower portion of the double stand leaves the drill
floor.
[0032] In step 6, the iron roughneck may be extended to the mouse
hole including three pipes to make up the double stand and the
other pipe to form a triple stand. The iron roughneck may be
retracted after making up the double stand and the other pipe.
[0033] In step 7, the triple stand may be clamped, by the
stand-connecting mechanical arm, to move upward until a connector
at a lower portion of the triple stand leaves the drill floor. The
clamp head of the drill floor mechanical arm may support the lower
portion of the triple stand before the connector at the lower
portion of the triple stand leaves the drill floor.
[0034] In step 8, an upper portion of the triple stand may be
clamped or supported by a pipe racker on a finger board. The clamp
head of the stand-connecting mechanical arm may be opened and
driven to move upward. A lower portion of the triple stand may be
clamped or supported by the drill floor mechanical arm.
[0035] In step 9, the triple stand may be vertically transported,
by the pipe racker on the finger board and the drill floor
mechanical arm, to a region of at least one pipe setback,
synchronously.
[0036] In step 10, the triple stand may be lowered, by the pipe
racker on the finger board or the drill floor mechanical arm, to
the region of the at least one pipe setback. The clamp head of the
pipe racker on the finger board and the clamp head of the drill
floor mechanical arm may be opened and retracted, synchronously.
The drill floor mechanical arm may be returned to a storage
region.
[0037] A still further aspect of the present disclosure provides a
method connecting stands offline. The method may include the
following steps.
[0038] In step 1, a first pipe may be obliquely transported to a
drill floor via a power catwalk. A front portion of the first pipe
may be clamped using a clamp head of a stand-connecting mechanical
arm. The first pipe may be carried to move upward and adjusted to
vertical by the stand-connecting mechanical arm. The clamp head of
the stand-connecting mechanical arm may be moved to a position
right above a mouse hole A. The first pipe may be carried downward
and placed into the mouse hole A by the stand-connecting mechanical
arm.
[0039] In step 2, a second pipe may be obliquely transported to the
drill floor via the power catwalk. A front portion of the second
pipe may be clamped using the clamp head of the stand-connecting
mechanical arm. The second pipe may be carried to move upward and
adjusted to vertical by the stand-connecting mechanical arm. The
clamp head of the stand-connecting mechanical arm may be moved to
the position right above the mouse hole A. The second pipe may be
carried downward. A connector at a lower portion of the second pipe
may be placed into a connector at an upper portion of the first
pipe.
[0040] In step 3, an iron roughneck may be extended to the mouse
hole A to make up the first pipe and the second pipe to form a
double stand. The iron roughneck may be retracted after making up
the first pipe and the second pipe.
[0041] In step 4, the double stand may be clamped, by the
stand-connecting mechanical arm, to move upward until a connector
at a lower portion of the double stand leaves the drill floor. A
clamp head of a drill floor mechanical arm may support the lower
portion of the double stand before the connector at the lower
portion of the double stand leaves the drill floor.
[0042] In step 5, an upper portion of the double stand may be
clamped or supported by a pipe racker on a finger board. The clamp
head of the stand-connecting mechanical arm may be opened and
driven to move upward. A lower portion of the double stand may be
clamped or supported by the drill floor mechanical arm.
[0043] In step 6, the double stand may be vertically transported,
by a pipe racker on a finger board and the drill floor mechanical
arm, to a region of at least one pipe setback, synchronously.
[0044] In step 7, the double stand may be lowered, by the pipe
racker on the finger board or the drill floor mechanical arm, to
the region of the at least one pipe setback. The clamp head of the
pipe racker on the finger board and the clamp head of the drill
floor mechanical arm may be opened and retracted, synchronously.
The drill floor mechanical arm may be returned to a storage
region.
[0045] The present disclosure may include the following beneficial
effects.
[0046] Firstly, during the tripping out and tripping in, the pipe
racker on the finger board and the drill floor mechanical arm may
be used to vertically transport pipes, synchronously, which may
reduce a well center occupy time when the stand is transported. The
drilling machine with an original structure may be used to
vertically transport the stand, thereby improving the efficiency of
tripping out and tripping in, and reducing the risk of accidents in
the well. Secondly, the top drive in the present disclosure may
include no horizontal telescopic mechanism. Differences between
sizes of the mast and the base in the present disclosure and those
in the existing drilling machine may not be large. Therefore, the
top drive in the present disclosure may be suitable for modified
and new drilling machines. Thirdly, during the drilling, connecting
stands offline using the stand-connecting mechanical arm, the pipe
racker on the finger board, the drill floor mechanical arm, the
iron roughneck, the power catwalk, and two mouse holes in the
present disclosure may reduce a preparation time during the
drilling, improve the drilling efficiency, and reduce the cost of
oilfield development.
BRIEF DESCRIPTION OF THE DRAWINGS
[0047] FIG. 1 is a schematic diagram illustrating an exemplary
drilling machine according to some embodiments of the present
disclosure;
[0048] FIG. 2 is a schematic diagram illustrating a side view of
the drilling machine in FIG. 1;
[0049] FIG. 3 is a schematic diagram illustrating a base of the
drilling machine in FIG. 1;
[0050] FIG. 4 is a schematic diagram illustrating a drill floor
mechanical arm of the drilling machine in FIG. 1;
[0051] FIG. 5 is a schematic diagram illustrating a top driver of
the drilling machine in FIG. 1;
[0052] FIG. 6 is a schematic diagram illustrating a
stand-connecting mechanical arm of the drilling machine in FIG.
1;
[0053] FIG. 7 is a schematic diagram illustrating a pipe racker on
a finger board of the drilling machine in FIG. 1;
[0054] FIGS. 8-15 are schematic diagrams illustrating an exemplary
process of tripping out according to some embodiments of the
present disclosure;
[0055] FIG. 16 is a schematic diagram illustrating a top view of a
mouse hole A, a mouse hole B, and a drill floor mechanical arm
according to some embodiments of the present disclosure;
[0056] FIGS. 17-28 are schematic diagrams illustrating an exemplary
process for connecting stands according to some embodiments of the
present disclosure; and
[0057] FIG. 29 is a flowchart illustrating an exemplary process for
connecting stands according to some embodiments of the present
disclosure.
DETAILED DESCRIPTION
[0058] In order to make the present disclosure more clearly, the
technical solutions in the present disclosure may be described
clearly and completely with reference to the accompanying drawings
in some embodiments of the present disclosure. It should be
understood that the drawings are merely for the purposes of
illustration and description, and are not intended to limit the
protection scope of the present disclosure. The techniques that are
implemented in the present disclosure are within the scope of the
present disclosure.
[0059] In some embodiments, as shown in FIGS. 1-7 and 16, the
drilling machine may include a base (1), a mast (2) arranged on the
base (1), a drawwork (3), a driller room (4), an iron roughneck
(5), a drill floor mechanical arm (6), a mouse hole A (7-1) and a
mouse hole B (7-2), a top drive (8) arranged on the mast (2), a
stand-connecting mechanical arm (9), a power finger board (10), a
pipe racker (11) on a finger board, and a power catwalk (12)
arranged on the ground.
[0060] In some embodiments, the base (1) may include an upper seat
(1-1), a lower seat (1-2), an intermediate outrigger (1-3) disposed
between the upper seat (1-1) and the lower seat (1-2), a support
seat (1-4) disposed on the upper seat (1-1), and a connection
support. In some embodiments, the upper seat (1-1) and the lower
seat (1-2) may be connected by the intermediate outrigger (1-3).
The lower seat (1-2) may be connected via the connection
support.
[0061] In some embodiments, the mast (2) may be arranged on the
base (1). For example, a lower portion of the mast (2) may be
hinged with the support seat (1-4) on the base (1). A load on the
mast (2) may act on the base (1) via the support seat (1-4). In
some embodiments, a base of the drawwork (3) may be arranged in an
upper surface of the upper seat (1-1) via a pin or bolt. In some
embodiments, the top drive (8) may be pulled to move in a vertical
direction via a traction rope by the drawwork (3). In some
embodiments, a position of the drawwork (3) may be disposed in a
moving direction of the top drive (8) to reduce the traction of the
drawwork (3) to pull the top drive (8). In some embodiments, the
driller room (4) may be arranged in the upper surface of the upper
seat (1-1), and fixed to the upper surface of the upper seat (1-1)
via a bolt or pin. A position of the driller room (4) may be
located at a side of the mast (2). In some embodiments, the iron
roughneck (5) may be arranged in the upper surface of the upper
seat (1-1). A position of the iron roughneck (5) may be located at
a side of the mast (2) and located at an opposite side of the
driller room (4). In some embodiments, the iron roughneck (5) may
be extended horizontally. An operation range of the iron roughneck
(5) may include a well center and a position for connecting stands
offline.
[0062] In some embodiments, the drill floor mechanical arm (6) may
be used to transport a drill rod or a stand. In some embodiments,
as shown in FIG. 4 and FIG. 16, the drill floor mechanical arm (6)
may include a rail (6-1), a traveling mechanism (6-2), a string
(6-3), a telescopic mechanism (6-4), and a guide clamp (6-5). In
some embodiments, the drill floor mechanical arm (6) may be
arranged between the well center and the power catwalk (12),
opposite the drawwork (3) relative to the well center. The rail
(6-1) may be disposed on the base (1) and located between at least
one pipe setback to form an L-shape. The traveling mechanism (6-2)
may be arranged on the rail (6-1). The traveling mechanism (6-2)
may be moved between a position close to the well center and a
position close to the power catwalk (12) along the rail (6-1). The
string (6-3) may be arranged on the traveling mechanism (6-2). The
telescopic mechanism (6-4) may be arranged on the string (6-3). The
telescopic mechanism (6-4) may be moved up and down along the
string (6-3). The telescopic mechanism (6-4) may be extended or
retracted relative to the string (6-3). The guide clamp (6-5) may
be arranged on an end portion of the telescopic mechanism (6-4) for
clamping or supporting a pipe. In some embodiments, the pipe may
include, but not be limited to, a drill rod, a stand, a drill
collar, a sleeve, etc. When the power catwalk (12) transports a
pipe to a drill floor, the drill floor mechanical arm (6) may be
located at a front end of the storage pipe setback and allows an
area of a drill pipe. When the drill floor mechanical arm (6) has a
lifting function, a lifting mechanism may be added to the string
(6-3). In some embodiments, the lifting mechanism may include, but
not be limited to, a cylinder, a gear rack, or the like.
[0063] The mouse hole may be used to place a pipe (e.g., the drill
rod, the stand, etc.) so that the drill rods may be connected to
form the stand. In some embodiments, as shown in FIG. 16, the mouse
hole A (7-1) and the mouse hole B (7-2) may be disposed on the base
(1). The mouse hole A (7-1) and the mouse hole B (7-2) may be
positioned between the at least one pipe setback and the well
center. In some embodiments, the mouse hole A (7-1) and the mouse
hole B (7-2) may be symmetrical to a center line of the rail (6-1).
In some embodiments, the pipe setback may also include two pipe
setbacks symmetrical to the center line of the rail (6-1). In some
embodiments, the mouse hole A (7-1) and the mouse hole B (7-2) may
be disposed adjacent to each side of the two pipe setbacks, so that
the connected stand may be transported to place into the nearby
pipe setback from the mouse hole A (7-1) and the mouse hole B
(7-2). In some embodiments, the lower seat (1-2) of the base (1)
may be disposed with lower supports (7-3, 4) of the mouse hole A
(7-1) and the mouse hole B (7-2) for supporting the drill rods in
the mouse hole A (7-1) and the mouse hole B (7-2). During a process
for connecting stands offline, if there is a filling in a circle of
the mouse hole A (7-1) or the mouse hole B (7-2), the mouse hole A
(7-1) or the mouse hole B (7-2) may be placed a pipe. If there is
no filling in the circle of the mouse hole A (7-1) or the mouse
hole B (7-2), the mouse hole A (7-1) or the mouse hole B (7-2) may
not be placed a pipe.
[0064] In some embodiments, a number (count) of mouse holes may be
one or multiple. In some embodiments, the number (count) of mouse
holes may be set according to a maximum length of the stand. In
some embodiments, the number (count) of mouse holes may be
determined according to Equation (1):
Nm=Nc-1. (1)
As used herein, Nm refers to the number (count) of mouse holes. Nc
refers to a number (count) of drill rods used to be connected.
[0065] For example, when the maximum length of the connecting stand
is 4 stands (i.e., four drill rods are connected to form a stand),
the number (count) of mouse holes may be 3. As another example,
when the maximum length of the connecting stand is 3 stands (i.e.,
three drill rods are connected to form a stand), the number (count)
of mouse holes may be 2. More descriptions regarding connecting
stands using the plurality of mouse holes may be found elsewhere in
the present disclosure, which is not repeated.
[0066] In some embodiments, the number (count) of mouse holes may
be fixed to two. In some embodiments, the drilling machine may
perform an operation for connecting stands with any length using
two mouse holes. More descriptions regarding connecting stands with
any length using two mouse holes may be found elsewhere in the
present disclosure, which is not repeated.
[0067] The top drive (8) may include a power elevator (8-1) (also
referred to as elevator (8-1)), a top drive body (8-2), and a top
drive rail (8-3). The top-drive rail (8-3) may be vertically
arranged on a rear surface of the mast (2). The top drive (8) may
be moved up and down along the top drive rail (8-3). A lower end of
the top drive (8) may be arranged with the power elevator (8-1).
The power elevator (8-1) may be opened and closed by a hydraulic
source. In some embodiments, the power elevator (8-1) may be tilted
relative to a vertical direction to make room for an upper end of
the pipe. For example, the power elevator (8-1) may be tilted to a
position close to the top drive rail (8-3). The position where the
power elevator (8-1) is located before tilted may be used to
accommodate an upper end of a pipe.
[0068] In some embodiments, the stand-connecting mechanical arm (9)
may be arranged on the mast and configured to move up-and-down
along the mast, clamping and driving a pipe to move. In some
embodiments, the stand-connecting mechanical arm (9) may be used to
transport the drill rod or the stand to the mouse hole for
connecting stands. In some embodiments, the stand-connecting
mechanical arm (9) may also be used to transport the connected
stand to a region of at least one pipe setback. As shown in FIG. 6,
the stand-connecting mechanical arm (9) may include a slip
mechanism (9-1), a rotary reducer (9-2), a rotary support seat
(9-3), a variable amplitude mechanism (9-4), a clamp head (9-5),
and a slip rail (9-6). The slip rail (9-6) may be arranged on a
front (or side) surface of a main leg (2-1) of the mast (2). The
slip mechanism (9-1) may be moved vertically along the slip guide
(9-6). The rotary reducer (9-2) may be arranged on the slip
mechanism (9-1). The rotary support seat (9-3) may be connected to
the rotary reducer (9-2). The variable amplitude mechanism (9-4)
may be arranged on the rotary support seat (9-3). The clamp head
(9-5) may be arranged on the variable amplitude mechanism (9-4).
The connection and coordination of the above components may enable
the clamp head (9-5) to move to a designated position. In some
embodiments, a number (count) of the stand-connecting mechanical
arm (9) may be two. For example, the drilling machine may include a
first stand-connecting mechanical arm and a second stand-connecting
mechanical arm. In some embodiments, the two stand-connecting
mechanical arms may be used to transport different drill rods or
stands to the mouse hole or the at least one pipe setback,
respectively.
[0069] A platform of the power finger board (10) may be arranged on
a front surface of the main leg (2-1) of the mast (2). The platform
and the main leg (2-1) of the mast (2) may be connected via a pin
or bolt. A lower surface of the platform and the main leg (2-1) of
the mast (2) may be hinged by an inclined strut (10-2).
[0070] As shown in FIG. 7, the pipe racker (11) on the finger board
may be arranged on the power finger board. The pipe racker (11) on
the finger board may include a clamp head (11-1), a variable
amplitude mechanism (11-2), a rotary mechanism (11-3), and a
traveling mechanism (11-4). As used herein, the variable amplitude
mechanism (11-2), the rotary mechanism (11-3), and the traveling
mechanism (11-4) may be used as connection components between the
clamp head (11-1) and the power finger board, which may drive the
clamp head (11-1) to perform a specified movement in space. In some
embodiments, the clamp head (11-1) may be used to clamp or support
the pipe. When the pipe racker (11) on the finger board has a
clamping function, a mechanism (e.g., a cylinder, a gear rack, or a
ball screw) may be arranged between the variable amplitude
mechanism (11-2) and the rotary mechanism (11-3), so that the clamp
head (11-1) may rise and fall in the vertical direction.
[0071] Some embodiments of the present disclosure may also include
a tripping out and tripping in method. The method may be
implemented as shown in FIGS. 8 to 15. In some embodiments, an
entire process of tripping out may be as follows.
[0072] In step 1, the top drive (8) may be placed at a low
position. The elevator (8-1) may be opened to clamp a string of a
well center. The elevator (8-1) may be shut. The string of the well
center may be lifted upward.
[0073] In some embodiments, the string may be a pipe connecting
with a drill bit, such as a drill rod, a stand, or the like.
[0074] In step 2, a power slip may be turned off after the top
drive (8) arrives at a high position. The string may be placed on
the power slip. That is, the power slip may be used to fix the
string.
[0075] In step 3, the iron roughneck (5) may be extended to the
well center to break out. An upper portion of the string may be
fixed via the elevator (8-1) of the top drive (8).
[0076] In step 4, the iron roughneck (5) may be retracted. The pipe
racker (11) on the finger board and the drill floor mechanical arm
(6) may be extended to the well center, synchronously. A clamp head
of the pipe racker (11) on the finger board may be opened to clamp
or support an upper portion of a stand. A guide clamp (6-5) of the
drill floor mechanical arm (6) may be opened to clamp or support a
lower portion of the stand.
[0077] In some embodiments, a height of the pipe racker (11) on the
finger board may be adjusted based on a length of the stand. In
some embodiments, the clamp head of the pipe racker (11) on the
finger board may be used to clamp or support at a position close to
an upper end portion of the stand. In some embodiments, the clamp
head (11-1) of the pipe racker (11) on the finger board may be used
to clamp or support at a position of 0.2 to 1 meter from the upper
end portion of the stand. In some embodiments, the drill floor
mechanical arm (6) may be arranged on the base (1). The guide clamp
(6-5) of the drill floor mechanical arm (6) may be used to clamp or
support at a position close to a lower end portion of the stand. In
some embodiments, the guide clamp (6-5) of the drill floor
mechanical arm (6) may be used to clamp or support at a position of
0.2 to 1 meter from the lower end portion of the stand. The upper
portion and the lower portion of the stand may be clamped or
supported by two different mechanical arms on the drilling machine,
which may vertically transport the stand, adapt stands with
different lengths, and select an appropriate clamping or supporting
position. During the transportation of the stand, an unnecessary
shake may be avoided, thereby improving the stability and
reliability of the operation.
[0078] In step 5, the elevator (8-1) of the top drive (8) may be
opened. The elevator (8-1) may be tilted backward.
[0079] In step 6, the pipe racker (11) on the finger board and the
drill floor mechanical arm (6) may be retracted, rotated, and moved
synchronously to transport the stand to a region of at least one
pipe setback. The stand may remain vertical during the
transportation of the stand.
[0080] In step 7, the stand may be lowered to the region of the at
least one pipe setback by the pipe racker (11) on the finger board
or the drill floor mechanical arm (6). The clamp head of the pipe
racker (11) on the finger board and the clamp head of the drill
floor mechanical arm (6) (the clamp head (11-1) and the guide clamp
(6-5)) may be opened and retracted, synchronously.
[0081] In step 8, the pipe racker (11) on the finger board and the
drill floor mechanical arm (6) may be moved, rotated, or extended
to a position close to the well center, synchronously, to wait for
clamping a next stand.
[0082] During the steps 6-8, after the stand is out of the well
center, the top drive (8) may be moved downward to the low position
to perform the step 1 and continue to a next cycle.
[0083] The process of the tripping in may be the inverse of the
process of the tripping out. In some embodiments, the drilling
machine may further include a thread grease doper. The thread
grease doper may be arranged on the drilling machine. For example,
the thread grease doper may be integrated on the drill floor
mechanical arm (6) or the iron roughneck (5). A thread grease may
be doped in a process that the top drive moves downward, which is
not repeated.
[0084] In some embodiments, the top drive (8) may include a
telescopic mechanism. The telescopic mechanism may be used to
control the top drive (8) to move in the horizontal surface. In
some embodiments, in the process of tripping out and tripping in,
when a stand is disconnected from a string of the well center or a
stand is connected into a string of the well center, the telescopic
mechanism may be used to control the top-drive (8) to move out from
a position where the stand is located. Therefore, the top-drive (8)
may synchronously perform the following steps and not wait at the
position.
[0085] In some embodiments, the process of the tripping out may
include the following steps.
[0086] In step 1, the top drive (8) may be placed at a low
position. The elevator (8-1) may be opened to clamp a string of a
well center. The elevator (8-1) may be shut. The string of the well
center may be lifted upward.
[0087] In step 2, a power slip may be turned off. The string may be
placed on the power slip after the top drive (8) arrives at a high
position.
[0088] In step 3, the pipe racker (11) on the finger board and the
drill floor mechanical arm (6) may be extended to the well center,
synchronously. The clamp head (11-1) of the pipe racker (11) on the
finger board may be opened to clamp or support an upper portion of
a stand. The guide clamp (6-5) of the drill floor mechanical arm
(6) may be opened to clamp or support a lower portion of the
stand.
[0089] In step 4, the elevator (8-1) of the top drive (8) may be
opened. The elevator (8-1) may be tilted backward. The telescopic
mechanism may be used to control the top drive (8) to space a
position where a string at the well center is located. The top
drive (8) may be moved to a lower position. At the same time, the
iron roughneck (5) may be extended to the well center to break out.
The iron roughneck may be retracted after the breaking out.
[0090] In step 5, the pipe racker (11) on the finger board and the
drill floor mechanical arm (6) may be retracted, rotated, and moved
synchronously to transport the stand to the region of the at least
one pipe setback. The stand may remain vertical during the
transportation of the stand.
[0091] In step 6, the top drive (8) may be moved downward to the
low position to repeat the step 1 and step 2. At the same time, the
stand may be lowered to the region of the at least one pipe setback
by the pipe racker (11) on the finger board or the drill floor
mechanical arm (6). The clamp head of the pipe racker (11) on the
finger board and the clamp head of the drill floor mechanical arm
(6) (the clamp head (11-1) and the guide clamp (6-5)) may be opened
and retracted, synchronously.
[0092] In step 7, the pipe racker (11) on the finger board and the
drill floor mechanical arm (6) may be moved, rotated, or extended
to a position close to the well center, synchronously, to wait for
clamping a next stand.
[0093] In some embodiments, the process of the tripping in may be
the inverse of the process of the tripping out, which is not
repeated.
[0094] Some embodiments of the present disclosure may also include
a method for connecting stands. The method may be implemented as
shown in FIGS. 17 to 28. In some embodiments, an entire process may
be as follows.
[0095] In step 1, a first pipe (e.g., a drill rod, a drill collar,
a sleeve, etc.) may be obliquely transported to a drill floor (the
upper surface of the upper seat (1-1)) via the power catwalk (12).
A connector of the first pipe may be outside a main body of the
power catwalk (12) to connect the stand-connecting mechanical arm
(9) at the lower position. A clamp head (9-5) may be tilted to be
parallel to an axis of the first pipe. The clamp head (9-5) may be
opened to clamp a front portion of the first pipe.
[0096] In step 2, the first pipe may be carried to move upward by
the stand-connecting mechanical arm (9). The first pipe may be
tilted from horizontal or slant to vertical by adjusting the clamp
head (9-5) and the variable amplitude mechanism (9-4).
[0097] In some embodiments, the first pipe may be directly carried
to move upward by the stand-connecting mechanical arm (9) to adjust
the first pipe to vertical. In some embodiments, in order to avoid
sloshing during the transportation of the first pipe, when the
first pipe is carried to move upward by the stand-connecting
mechanical arm (9), the first pipe may be clamped by the drill
floor mechanical arm (6) to adjust the first pipe to vertical.
[0098] In step 3, a clamp head of the stand-connecting mechanical
arm (9) may rotate clockwise at a first angle along a vertical axis
to a position right above the mouse hole A (7-1). The first pipe
may be carried to move downward and placed into the mouse hole A
(7-1).
[0099] The step 1 and the step 2 may be repeated to clamp a second
pipe.
[0100] In step 4, the clamp head (9-5) of the stand-connecting
mechanical arm (9) may rotate counterclockwise at a second angle
along the vertical axis to a position right above the mouse hole B
(7-2). The second pipe may be carried to move downward and placed
into the mouse hole B (7-2).
[0101] The step 1 and the step 2 may be repeated to clamp a third
pipe.
[0102] In step 5, the clamp head (9-5) of the stand-connecting
mechanical arm (9) may rotate clockwise at the first angle or
counterclockwise at the second angle along the vertical axis to the
position right above the mouse hole A (7-1) or the mouse hole B
(7-2). The third pipe may be carried to move downward. A connector
at a lower portion of the third pipe may be placed into a connector
at an upper portion of the first pipe or the second pipe.
[0103] In step 6, the iron roughneck (5) may be extended to the
mouse hole (the mouse hole A (7-1) or the mouse hole B (7-2))
including two pipes to make up the two pipes to form a double
stand. The iron roughneck (5) may be retracted after making up the
two pipes.
[0104] In step 7, the double stand may be clamped, by the
stand-connecting mechanical arm (9), to move upward until a lower
end of the double stand is higher than the drill floor. The
stand-connecting mechanical arm (9) may be synchronously moved to a
position right above the other pipe in the other mouse hole. The
double stand may be lowered downward until a connector at the lower
portion of the double stand is placed into a connector at an upper
portion of the other pipe. The clamp head (6-5) of the drill floor
mechanical arm (6) may support the lower portion of the double
stand before the connector at the lower portion of the double stand
leaves the drill floor.
[0105] In step 8, the iron roughneck (5) may be extended to the
mouse hole including three pipes to make up the double stand and
the other pipe to form a triple stand. The iron roughneck (5) may
be retracted after making up the double stand and the other
pipe.
[0106] In step 9, the triple stand may be clamped, by the
stand-connecting mechanical arm (9), to move upward until a
connector at a lower portion of the triple stand leaves the drill
floor. The clamp head (6-5) of the drill floor mechanical arm (6)
may support the lower portion of the triple stand before the
connector at the lower portion of the triple stand leaves the drill
floor.
[0107] In step 10, an upper portion of the triple stand may be
clamped or supported by the pipe racker (11) on the finger board.
The clamp head of the stand-connecting mechanical arm (9) may be
opened and driven to move upward. A lower portion of the triple
stand may be clamped or supported by the drill floor mechanical arm
(6).
[0108] In step 11, the triple stand may be vertically transported,
by the pipe racker on the finger board (11) and the drill floor
mechanical arm (6), to the region of the at least one pipe setback,
synchronously.
[0109] In step 12, the triple stand may be lowered, by the pipe
racker (11) on the finger board or the drill floor mechanical arm
(6), to the region of the at least one pipe setback. The clamp head
of the pipe racker (11) on the finger board and the clamp head of
the drill floor mechanical arm (6) (the clamp head (11-1) and the
guide clamp (6-5)) may be opened and retracted, synchronously. The
drill floor mechanical arm (6) may be returned to a storage
region.
[0110] Steps 1-12 may be repeated to circularly connect a next
triple stand offline. In some embodiments, the drilling machine may
further include a thread grease doper. The thread grease doper may
be arranged on the drilling machine. For example, during a process
for connecting stands, the thread grease doper may be integrated
into the iron roughneck (5) or the drill floor mechanical arm (6)
to dope a thread grease.
[0111] The method for connecting a double stand offline may be a
simplification of the above method, which is not repeated.
[0112] Some embodiments of the present disclosure may also include
a method for connecting a quadruple stand using two mouse holes
through the stand-connecting mechanical arm (9). The process may be
as follows.
[0113] In step 1, a first pipe (e.g., a drill rod, a drill collar,
a sleeve, etc.) may be obliquely transported to a drill floor (the
upper surface of the upper seat (1-1)) via the power catwalk (12).
A connector of the first pipe may be outside the main body of the
power catwalk (12) to connect the stand-connecting mechanical arm
(9) at the lower position. A clamp head (9-5) may be tilted to be
parallel to an axis of the first pipe. The clamp head (9-5) may be
opened to clamp a front portion of the first pipe.
[0114] In step 2, the first pipe may be carried to move upward by
the stand-connecting mechanical arm (9). The first pipe may be
tilted from horizontal or slant to vertical by adjusting the clamp
head (9-5) and the variable amplitude mechanism (9-4).
[0115] In some embodiments, the first pipe may be directly carried
to move upward by the stand-connecting mechanical arm (9) to adjust
the first pipe to vertical. In some embodiments, in order to avoid
sloshing during transporting the first pipe, when the first pipe is
carried to move upward by the stand-connecting mechanical arm (9),
the first pipe may be clamped by the drill floor mechanical arm (6)
to adjust the first pipe to vertical.
[0116] In step 3, a clamp head of the stand-connecting mechanical
arm (9) may rotate clockwise at a first angle along a vertical axis
to a position right above the mouse hole A (7-1). The first pipe
may be carried to move downward and placed into the mouse hole A
(7-1).
[0117] The step 1 and the step 2 may be repeated to clamp a second
pipe.
[0118] In step 4, the clamp head (9-5) of the stand-connecting
mechanical arm (9) may rotate counterclockwise at a second angle
along the vertical axis to a position right above the mouse hole B
(7-2). The second pipe may be carried to move downward and placed
into the mouse hole B (7-2).
[0119] The step 1 and the step 2 may be repeated to clamp a third
pipe.
[0120] In step 5, the clamp head (9-5) of the stand-connecting
mechanical arm (9) may rotate clockwise at the first angle or
counterclockwise at the second angle along the vertical axis to the
position right above the mouse hole A (7-1) or the mouse hole B
(7-2). The third pipe may be carried to move downward. A connector
at a lower portion of the third pipe may be placed into a connector
at an upper portion of the first pipe or the second pipe.
[0121] In step 6, the iron roughneck (5) may be extended to the
mouse hole (the mouse hole A (7-1) or the mouse hole B (7-2))
including two pipes to make up the two pipes to form a first double
stand. The iron roughneck (5) may be retracted after making up the
two pipes.
[0122] In step 7, the first double stand in the mouse hole (the
mouse hole A (7-1) or the mouse hole B (7-2)) may be clamped, by
the stand-connecting mechanical arm (9), to move downward until a
connector at an upper portion of the first double stand is exposed
from the mouse hole A (7-1) or the mouse hole B (7-2).
[0123] The step 1 and the step 2 may be repeated to clamp a fourth
pipe.
[0124] In step 8, the clamp head (9-5) of the stand-connecting
mechanical arm (9) may rotate clockwise at the first angle or
counterclockwise at the second angle along the vertical axis to the
position right above the mouse hole A (7-1) or the mouse hole B
(7-2) which includes a single pipe. The fourth pipe may be carried
to move downward. A connector at a lower portion of the fourth pipe
may be placed into a connector at an upper portion of the single
pipe.
[0125] In step 9, the iron roughneck (5) may be extended to the
mouse hole (the mouse hole A (7-1) or the mouse hole B (7-2))
including two pipes to make up the two pipes to form a second
double stand. The iron roughneck (5) may be retracted after making
up the two pipes.
[0126] In step 10, the second double stand may be clamped, by the
stand-connecting mechanical arm (9), to move upward until a
connector at a lower portion of the second double stand is higher
than the drill floor. The stand-connecting mechanical arm (9) may
be synchronously moved to a position right above the first double
stand in the other mouse hole. The second double stand may be
lowered downward until a connector at the lower portion of the
second double stand is placed into a connector at an upper portion
of the first double stand. The clamp head (6-5) of the drill floor
mechanical arm (6) may support the lower portion of the second
double stand before the connector at the lower portion of the
second double stand leaves the drill floor.
[0127] In step 11, the iron roughneck (5) may be extended to the
mouse hole placing the first double stand and the second double
stand to make up the first double stand and the second double stand
to form a quadruple stand. The iron roughneck (5) may be retracted
after making up the two pipes.
[0128] In step 12, the quadruple stand may be clamped, by the
stand-connecting mechanical arm (9), to move upward until a
connector at a lower portion of the quadruple stand leaves the
drill floor with a certain height. The clamp head (6-5) of the
drill floor mechanical arm (6) may support the lower portion of the
quadruple stand before the connector at the lower portion of the
quadruple stand leaves the drill floor.
[0129] In step 13, an upper portion of the quadruple stand may be
clamped or supported by the pipe racker (11) on the finger board.
The clamp head of the stand-connecting mechanical arm (9) may be
opened and driven to move upward. A lower portion of the quadruple
stand may be clamped or supported by the drill floor mechanical arm
(6).
[0130] In step 14, the quadruple stand may be vertically
transported, by the pipe racker on the finger board (11) and the
drill floor mechanical arm (6), to the region of the at least one
pipe setback, synchronously.
[0131] In step 15, the quadruple stand may be lowered, by the pipe
racker (11) on the finger board or the drill floor mechanical arm
(6), to the region of the at least one pipe setback. The clamp head
of the pipe racker (11) on the finger board and the clamp head of
the drill floor mechanical arm (6) (the clamp head (11-1) and the
guide clamp (6-5)) may be opened and retracted, synchronously. The
drill floor mechanical arm (6) may be returned to a storage
region.
[0132] Steps 1-15 may be repeated to circularly connect a next
quadruple stand offline. In some embodiments, the drilling machine
may further include a thread grease doper. The thread grease doper
may be arranged on the drilling machine. For example, during a
process for connecting stands, the thread grease doper may be
integrated into the iron roughneck (5) or the drill floor
mechanical arm (6) to dope a thread grease.
[0133] Some embodiments of the present disclosure may also include
another method for connecting a quadruple stand using two mouse
holes through the stand-connecting mechanical arm (9). The process
may be as follows.
[0134] In step 1, a first pipe (e.g., a drill rod, a drill collar,
a sleeve, etc.) may be obliquely transported to a drill floor (the
upper surface of the upper seat (1-1)) via the power catwalk (12).
A connector of the first pipe may be outside the main body of the
power catwalk (12) to connect the stand-connecting mechanical arm
(9) at the lower position. A clamp head (9-5) may be tilted to be
parallel to an axis of the first pipe. The clamp head (9-5) may be
opened to clamp a front portion of the first pipe.
[0135] In step 2, the first pipe may be carried to move upward by
the stand-connecting mechanical arm (9). The first pipe may be
tilted from horizontal or slant to vertical by adjusting the clamp
head (9-5) and the variable amplitude mechanism (9-4).
[0136] In some embodiments, the first pipe may be directly carried
to move upward by the stand-connecting mechanical arm (9) to adjust
the first pipe to vertical. In some embodiments, in order to avoid
sloshing during transporting the first pipe, when the first pipe is
carried to move upward by the stand-connecting mechanical arm (9),
the first pipe may be clamped by the drill floor mechanical arm (6)
to adjust the first pipe to vertical.
[0137] In step 3, a clamp head of the stand-connecting mechanical
arm (9) may rotate clockwise at a first angle along a vertical axis
to a position right above the mouse hole A (7-1). The first pipe
may be carried to move downward and placed into the mouse hole A
(7-1).
[0138] The step 1 and the step 2 may be repeated to clamp a second
pipe.
[0139] In step 4, the clamp head (9-5) of the stand-connecting
mechanical arm (9) may rotate counterclockwise at a second angle
along the vertical axis to a position right above the mouse hole B
(7-2). The second pipe may be carried to move downward and placed
into the mouse hole B (7-2).
[0140] The step 1 and the step 2 may be repeated to clamp a third
pipe.
[0141] In step 5, the clamp head (9-5) of the stand-connecting
mechanical arm (9) may rotate clockwise at the first angle or
counterclockwise at the second angle along the vertical axis to the
position right above the mouse hole A (7-1) or the mouse hole B
(7-2). The third pipe may be carried to move downward. A connector
at a lower portion of the third pipe may be placed into a connector
at an upper portion of the first pipe or the second pipe.
[0142] In step 6, the iron roughneck (5) may be extended to the
mouse hole (the mouse hole A (7-1) or the mouse hole B (7-2))
including two pipes to make up the two pipes to form a double
stand. The iron roughneck (5) may be retracted after making up the
two pipes.
[0143] In step 7, the double stand may in the mouse hole (the mouse
hole A (7-1) or the mouse hole B (7-2)) be clamped, by the
stand-connecting mechanical arm (9), to move downward until a
connector at an upper portion of the double stand is exposed from
the mouse hole A (7-1) or the mouse hole B (7-2).
[0144] The step 1 and the step 2 may be repeated to clamp a fourth
pipe.
[0145] In step 8, the clamp head (9-5) of the stand-connecting
mechanical arm (9) may rotate clockwise at the first angle or
counterclockwise at the second angle along the vertical axis to the
position right above the mouse hole A (7-1) or the mouse hole B
(7-2) including the double pipe. The fourth pipe may be carried to
move downward. A connector at a lower portion of the fourth pipe
may be placed into a connector at an upper portion of the double
pipe.
[0146] In step 9, the iron roughneck (5) may be extended to the
mouse hole (the mouse hole A (7-1) or the mouse hole B (7-2))
including the double pipe and the fourth pipe to make up the double
pipe and the fourth pipe to form a triple stand. The iron roughneck
(5) may be retracted after making up the double pipe and the fourth
pipe.
[0147] In step 10, the triple stand may be clamped, by the
stand-connecting mechanical arm (9), to move upward until a
connector at a lower portion of the triple stand is higher than the
drill floor. The stand-connecting mechanical arm (9) may be
synchronously moved to a position right above the single pipe in
the other mouse hole. The triple stand may be lowered downward
until a connector at the lower portion of the triple stand is
placed into a connector at an upper portion of the single pipe. The
clamp head (6-5) of the drill floor mechanical arm (6) may support
the lower portion of the triple stand before the connector at the
lower portion of the triple stand leaves the drill floor.
[0148] In step 11, the iron roughneck (5) may be extended to the
mouse hole including the triple stand and the single pipe to make
up the triple stand and the single pipe to form a quadruple stand.
The iron roughneck (5) may be retracted after making up the triple
stand and the single pipe.
[0149] In step 12, the quadruple stand may be clamped, by the
stand-connecting mechanical arm (9), to move upward until a
connector at a lower portion of the quadruple stand leaves the
drill floor. The clamp head (6-5) of the drill floor mechanical arm
(6) may support the lower portion of the quadruple stand before the
connector at the lower portion of the quadruple stand leaves the
drill floor.
[0150] In step 13, an upper portion of the quadruple stand may be
clamped or supported by the pipe racker (11) on the finger board.
The clamp head of the stand-connecting mechanical arm (9) may be
opened and driven to move upward. A lower portion of the quadruple
stand may be clamped or supported by the drill floor mechanical arm
(6).
[0151] In step 14, the quadruple stand may be vertically
transported, by the pipe racker on the finger board (11) and the
drill floor mechanical arm (6), to the region of the at least one
pipe setback, synchronously.
[0152] In step 15, the quadruple stand may be lowered, by the pipe
racker (11) on the finger board or the drill floor mechanical arm
(6), to the region of the at least one pipe setback. The clamp head
of the pipe racker (11) on the finger board and the clamp head of
the drill floor mechanical arm (6) (the clamp head (11-1) and the
guide clamp (6-5)) may be opened and retracted, synchronously. The
drill floor mechanical arm (6) may be returned to a storage
region.
[0153] Steps 1-15 may be repeated to circularly connect a next
quadruple stand offline. In some embodiments, the drilling machine
may further include a thread grease doper. The thread grease doper
may be arranged on the drilling machine. For example, during a
process for connecting stands, the thread grease doper may be
integrated into the iron roughneck (5) or the drill floor
mechanical arm (6) to dope a thread grease.
[0154] In some embodiments, the drilling machine may be used to
connect stands with any length by using two mouse holes through two
stand-connecting mechanical arms. The length of the stand may be
set according to task requirements of the drill rod. In some
embodiments, the length of a connected stand may include five
stands. The steps for connecting five stands may be described in an
exemplary flow 100. In some embodiments, the process 100 may be as
follows.
[0155] In S110, a first pipe and a second pipe may be transported
via a power catwalk. The first pipe and the second pipe may be
clamped and adjusted to vertical by a stand-connecting mechanical
arm.
[0156] In some embodiments, the first tube (e.g., the drill rod,
the drill collar, the sleeve, etc.) and the second pipe may be
obliquely transported to a drill floor via the power catwalk (12).
The first pipe and the second pipe may be clamped by the
stand-connecting mechanical arm.
[0157] In some embodiments, the first tube and the second pipe may
be transported via the power catwalk (12), synchronously. The first
pipe and the second pipe may be clamped by a first stand-connecting
mechanical arm and a second stand-connecting mechanical arm,
respectively. In some embodiments, one pipe may be transported once
via the power catwalk (12). One of the two stand-connecting
mechanical arms may clamp the stand to perform the subsequent
operations. When the pipe is removed, another pipe may be
transported to the drill floor via the power catwalk (12). Another
of the two stand-connecting mechanical arms may clamp the stand to
perform the subsequent operations.
[0158] In some embodiments, when the pipe is transported to the
drill floor, a connector of the pipe may be outside the main body
of the power catwalk (12). When one of the two stand-connecting
mechanical arms clamps the stand, the stand-connecting mechanical
arm may be located at a lower position. A clamp head of the
stand-connecting mechanical arm may be tilted to be parallel to an
axis of the first pipe. The clamp head may be opened to clamp a
front portion of the pipe.
[0159] In some embodiments, the pipe may be directly carried to
move upward by the stand-connecting mechanical arm to adjust the
pipe to vertical. In some embodiments, in order to avoid sloshing
during transporting the pipe, when the pipe is carried to move
upward by the stand-connecting mechanical arm, the pipe may be
clamped by the drill floor mechanical arm to adjust the pipe to
vertical.
[0160] In some embodiments, the first pipe and the second pipe may
be clamped by the first stand-connecting mechanical arm and the
second stand-connecting mechanical arm to adjust the first pipe and
the second pipe to vertical, respectively.
[0161] In S121, the first pipe may be placed into the mouse hole A
by the first stand-connecting mechanical arm.
[0162] In some embodiments, the clamp head of the first
stand-connecting mechanical arm may be rotated clockwise at a first
angle along the vertical axis to a position right above the mouse
hole A. The first pipe may be carried to move downward and placed
into the mouse hole A.
[0163] In S122, the second pipe may be placed into the mouse hole B
by the second stand-connecting mechanical arm.
[0164] In some embodiments, the clamp head of the second
stand-connecting mechanical arm may be rotated counterclockwise at
a second angle along the vertical axis to a position right above
the mouse hole B. The second pipe may be carried to move downward
and placed into the mouse hole B.
[0165] In some embodiments, operation S121 and operation S122 may
be performed simultaneously. In some embodiments, operation S121
and operation S122 may be performed in order.
[0166] In S130, a third pipe may be transported via the power
catwalk. The third pipe may be clamped and adjusted to vertical by
the first stand-connecting mechanical arm.
[0167] In some embodiments, the third pipe may be transported to
the drill floor via the power catwalk (12). After the first pipe is
placed in the mouse hole A by the first stand-connecting mechanical
arm, the first stand-connecting mechanical arm may be moved to the
power catwalk (12) to clamp the third pipe. In some embodiments,
the third pipe may be directly carried to move upward by the first
stand-connecting mechanical arm to adjust to vertical from
horizontal or slant by adjusting the clamp head and the variable
amplitude mechanism. In some embodiments, in order to avoid
sloshing during transporting the third pipe, when the third pipe is
carried to move upward by the first stand-connecting mechanical
arm, the third pipe may be clamped by the drill floor mechanical
arm (6) to adjust the third pipe to vertical.
[0168] In S140, the third pipe may be transported to the mouse hole
A or the mouse hole B by the first stand-connecting mechanical arm.
The third pipe may be connected to the first pipe or the second
pipe to form a double stand.
[0169] In some embodiments, the clamp head of the first
stand-connecting mechanical arm may rotate clockwise at the first
angle or counterclockwise at the second angle along the vertical
axis to the position right above the mouse hole A or the mouse hole
B. The third pipe may be carried to move downward. A connector at a
lower portion of the third pipe may be placed into a connector at
an upper portion of the first pipe or the second pipe.
[0170] In some embodiments, the iron roughneck (5) may be extended
to the mouse hole A or the mouse hole B including two pipes to make
up the two pipes to form the double stand. The iron roughneck (5)
may be retracted after making up the two pipes.
[0171] In S150, the fourth pipe may be transported via the power
catwalk. The fourth pipe may be clamped and adjusted to vertical by
the second stand-connecting mechanical arm.
[0172] In some embodiments, the fourth pipe may be transported to
the drill floor via the power catwalk (12). After the second pipe
is placed in the mouse hole B by the second stand-connecting
mechanical arm, the second stand-connecting mechanical arm may be
moved to the power catwalk (12) to clamp the fourth pipe. In some
embodiments, the fourth pipe may be directly carried to move upward
by the second stand-connecting mechanical arm to adjust to vertical
from horizontal or slant by adjusting the clamp head and the
variable amplitude mechanism. In some embodiments, in order to
avoid sloshing during transporting the fourth pipe, when the fourth
pipe is carried to move upward by the second stand-connecting
mechanical arm, the fourth pipe may be clamped by the drill floor
mechanical arm (6) to adjust the fourth pipe to vertical.
[0173] In some embodiments, operation S150 and operation S140 may
be performed simultaneously. In some embodiments, operation S150
and operation S140 may be performed in order.
[0174] In S161, the double pipe may be transported to the mouse
hole A or the mouse hole B by the first stand-connecting mechanical
arm. The double pipe may be connected to the first pipe or the
second pipe to form a triple stand.
[0175] In some embodiments, the double stand may be clamped, by the
first stand-connecting mechanical arm, to move upward until a
connector at a lower portion of the double stand is higher than the
drill floor with a certain height. The first stand-connecting
mechanical arm may be synchronously moved to a position right above
the pipe in the other mouse hole. The double stand may be lowered
downward until a connector at the lower portion of the double stand
is placed into a connector at an upper portion of the pipe. The
clamp head of the drill floor mechanical arm may support the lower
portion of the double stand before the connector at the lower
portion of the double stand leaves the drill floor.
[0176] In some embodiments, the iron roughneck (5) may be extended
to a position above the mouse hole including three pipes to make up
the double stand and the single pipe to form a triple stand. The
iron roughneck may be retracted after making up the double stand
and the single pipe.
[0177] In S162, the fourth pipe may be transported to the mouse
hole A or the mouse hole B by the second stand-connecting
mechanical arm.
[0178] In some embodiments, when the double stand is removed from
the mouse hole A or the mouse hole B by the second stand-connecting
mechanical arm, the fourth pipe may be placed into a space hole of
the mouse hole A or the mouse hole B by the second stand-connecting
mechanical arm.
[0179] In S171, the triple stand may be transported to the mouse
hole A or the mouse hole B by the first stand-connecting mechanical
arm. The triple stand and the fourth pipe may be connected to form
a quadruple stand.
[0180] In some embodiments, when the fourth pipe is placed into a
space hole of the mouse hole A or the mouse hole B by the second
stand-connecting mechanical arm, the second stand-connecting
mechanical arm may be moved from the mouse hole. Then, the triple
stand may be transported to the mouse hole via the first
stand-connecting mechanical arm. During the transportation of the
triple stand, the triple stand may be clamped, by the first
stand-connecting mechanical arm, to move upward until a connector
at a lower portion of the triple stand is higher than the drill
floor with a certain height. The first stand-connecting mechanical
arm may be synchronously moved to a position right above the fourth
pipe in the mouse hole where the fourth pipe is located. The triple
stand may be lowered downward until a connector at the lower
portion of the triple stand is placed into a connector at an upper
portion of the fourth pipe. The clamp head of the drill floor
mechanical arm may support the lower portion of the triple stand
before the connector at the lower portion of the triple stand
leaves the drill floor. The iron roughneck (5) may be extended to
the mouse hole including four pipes to make up the triple stand and
the fourth pipe to form the quadruple stand. The iron roughneck may
be retracted after making up the triple stand and the fourth
pipe.
[0181] In S172, the fifth pipe may be transported via the power
catwalk. The fifth pipe may be clamped by the second
stand-connecting mechanical arm and placed into the mouse hole A or
the mouse hole B.
[0182] In some embodiments, when the fifth pipe is placed into a
space hole of the mouse hole A or the mouse hole B by the second
stand-connecting mechanical arm, the second stand-connecting
mechanical arm may be moved from the mouse hole to the power
catwalk (12). After the fifth pipe is transported to the drill
floor via the power catwalk (12), the fifth pipe may be clamped by
the second stand-connecting mechanical arm. After the fifth pipe is
adjusted to vertical, the fifth pipe may be transported to a space
hole of the mouse hole A or the mouse hole B and placed into the
mouse hole.
[0183] In S180, the quadruple stand may be transported to the mouse
hole A or the mouse hole B by the first stand-connecting mechanical
arm. The quadruple stand may be connected to the fifth pipe to form
a quintuple stand.
[0184] In some embodiments, the operation of operation S180 may be
similar to operation S171, which is not repeated.
[0185] In some embodiments, when the operation S180 is completed,
the connected quintuple stand may be transported to the at least
one pipe setback to store by the first stand-connecting mechanical
arm or the second stand-connecting mechanical arm. In some
embodiments, the transportation of the quintuple stand may be
similar to the transportation of the double stand or the triple
stand. More descriptions regarding the transportation may be found
elsewhere in the present disclosure, which is not repeated.
[0186] The descriptions of the process 100 described above are
merely for illustration and description, without limiting the scope
of one or more embodiments of the present disclosure. In some
embodiments, in the above process, the functions performed by the
first stand-connecting mechanical arm and the second
stand-connecting mechanical arm may be interchanged. In some
embodiments, some operations may be merged or adjusted. For
example, operation S121 and operation S122 may be merged into one
operation. As another example, operation S150 may be performed
after operation S140. Alternative, operation S150 and operation
S140 may also be performed simultaneously.
[0187] By disposing two stand-connecting mechanical arms,
connecting stands with any length may be implemented by using two
mouse holes. There may be no need to open more mouse holes on the
base (1) when a plurality of stands are connected, which may
effectively save operation space on the base (1) and make a
structure of the drilling machine more compact. Further, by
disposing two stand-connecting mechanical arms, a next pipe to be
connected may be transported during the process for connecting
stands, which may effectively improve the operational efficiency of
connecting the plurality of stands.
* * * * *