U.S. patent application number 15/562829 was filed with the patent office on 2018-04-19 for particle drilling method.
The applicant listed for this patent is CCDC PETROLEUM DRILLING & PRODUCTION TECHNOLOGY CO., LTD.. Invention is credited to Li Chen, Xiaobin Chen, Chao He, Pan Hu, Weicheng Li, Bin Liu, Jianlin Yao.
Application Number | 20180106112 15/562829 |
Document ID | / |
Family ID | 54719619 |
Filed Date | 2018-04-19 |
United States Patent
Application |
20180106112 |
Kind Code |
A1 |
Li; Weicheng ; et
al. |
April 19, 2018 |
Particle drilling method
Abstract
A particle drilling method includes steps of: (a) injecting
particles, namely injecting slurry and the particles into a well
through an injection device; (b) recovering the particles,
specifically including steps of: enabling a mixture of particles,
rock debris and slurry returned from the well to directly flow into
a magnetic separator (10) by a pipeline through a rotational
control head at a drill floor; sending separated particles into a
storage tank by the magnetic separator (10); and sending a mixture
of rock debris and slurry into a slurry tank (11); and (c)
injecting the particles in the storage tank into the well through
the injection device for drilling again, so as to form a drilling
circulation. The above method effectively solves a problem of many
slurry leakage points in prior arts and greatly reduces an
environmental pollution risk.
Inventors: |
Li; Weicheng; (Guanghan,
Sichuan, CN) ; Yao; Jianlin; (Guanghan, Sichuan,
CN) ; Chen; Xiaobin; (Guanghan, Sichuan, CN) ;
Chen; Li; (Guanghan, Sichuan, CN) ; Liu; Bin;
(Guanghan, Sichuan, CN) ; He; Chao; (Guanghan,
Sichuan, CN) ; Hu; Pan; (Guanghan, Sichuan,
CN) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
CCDC PETROLEUM DRILLING & PRODUCTION TECHNOLOGY CO.,
LTD. |
Guanghan, Sichuan |
|
CN |
|
|
Family ID: |
54719619 |
Appl. No.: |
15/562829 |
Filed: |
July 8, 2016 |
PCT Filed: |
July 8, 2016 |
PCT NO: |
PCT/CN2016/089442 |
371 Date: |
September 28, 2017 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
E21B 7/16 20130101 |
International
Class: |
E21B 7/16 20060101
E21B007/16 |
Foreign Application Data
Date |
Code |
Application Number |
Jul 9, 2015 |
CN |
201510399376.9 |
Claims
1. A particle drilling method, comprising steps of particle
injection and particle recovery, wherein the step of particle
injection specifically comprises a step of injecting slurry and
particles into a well through an injection device; the step of
particle recovery specifically comprises steps of: enabling a
mixture of particles, rock debris and slurry returned from the well
to directly flow into a recovery device by a pipeline through an
exit device at a well mouth of a drill floor with utilizing liquid
energy; sending separated particles into a storage tank by a
magnetic separator of the recovery device; and sending a mixture of
rock debris and slurry into a slurry tank; and after the steps of
particle injection and particle recovery, the particles in the
storage tank are transported to the injection device and then
injected into the well through the injection device for drilling
again, so as to form a particle impact drilling circulation.
2. The particle drilling method, as recited in claim 1, wherein in
the step of particle injection, a particle injection speed is
0.5-10 kg/s.
3. The particle drilling method, as recited in claim 1, wherein in
the step of particle injection, a particle injection pressure is
5-55 MPa.
4. The particle drilling method, as recited in claim 1, wherein:
the storage tank is a rotational storage tank, comprising a tank
body, blades arranged in the tank body, a support frame, a screen
barrel and a motor driving the tank body to rotate; the blades and
the support frame are fixed on an inner wall of the tank body; and
the screen barrel is connected with the blades through the support
frame.
5. The particle drilling method, as recited in claim 1, wherein:
the injection device is a double-injection-pump continuous
injection device, comprising a particle mixing hopper which is
connected with a drilling vertical pipe through a high-pressure
pipeline; a reversing pipe is arranged in the particle mixing
hopper; the reversing pipe is connected with a swinging hydraulic
cylinder which drives the reversing pipe to swing from left to
right; a first transporting cylinder and a second transporting
cylinder are connected with the particle mixing hopper; when
injecting the particles, a first hydraulic cylinder, a second
hydraulic cylinder and the swinging hydraulic cylinder are firstly
started; the first hydraulic cylinder starts an addition stroke,
the swinging hydraulic cylinder swings the reversing pipe to the
second transporting cylinder so that the reversing pipe is
interconnected with the second transporting cylinder, and the
particles and the slurry enter the first transporting cylinder;
meanwhile, the second hydraulic cylinder starts a compression
stroke that the particles and the slurry in the second transporting
cylinder are injected into the high-pressure pipe through the
reversing pipe to enter an inner well circulation; the first
hydraulic cylinder starts a compression stroke after ending the
addition stroke, and the second hydraulic cylinder starts an
addition stroke, so as to continuously inject the particles through
an alternate operation.
6. The particle drilling method, as recited in claim 5, wherein:
the swinging hydraulic cylinder comprises cylinder bodies, pistons,
piston rods, a swinging rod and a spline connected with the
swinging rod; the pistons are connected with the swinging rod
through the respective piston rods; and the reversing pipe is
connected with the spline.
7-8. (canceled)
9. The particle drilling method, as recited in claim 5, wherein an
arrow-shaped check valve is connected with the high-pressure
pipeline.
10. The particle drilling method, as recited in claim 6, wherein an
arrow-shaped check valve is connected with the high-pressure
pipeline.
11. The particle drilling method, as recited in claim 1, wherein
the exit device comprises a rotational sprayer and a rotational
control head connected with the rotational sprayer.
Description
CROSS REFERENCE OF RELATED APPLICATION
[0001] This is a U.S. National Stage under 35 U.S.C 371 of the
International Application PCT/CN2016/089442, filed Jul. 8, 2016,
which claims priority under 35 U.S.C. 119(a-d) to CN
201510399376.9, filed Jul. 9, 2015.
BACKGROUND OF THE PRESENT INVENTION
Field of Invention
[0002] The present invention relates to a technical field of
oil-gas drilling engineering, and more particularly to a particle
drilling method.
Description of Related Arts
[0003] The conventional drilling method realizes the mechanical
rock breaking through utilizing the bit pressure and the rotation
of the drill bit at the well bottom, so as to achieve drilling.
With the above conventional drilling method, when meeting the deep
hard formation and the strong-abrasive formation, the rock breaking
merely relies on the mechanical action of the drill bit, and the
function of the slurry is only to carry the rock debris, which is
unable to realize the combined rock breaking effect of water power
and mechanical engineering, having the problems of slow drilling
speed, long period and high cost. In recent years, the particle
impact drilling technology as a revolutionary speed-up technology
has been widely applied. The particle impact drilling technology is
a drilling technology which injects spherical steel particles
having a diameter of 1-3 mm into the well bottom, so as to assist
in breaking the deep hard formation and the strong-abrasive
formation. An important factor to determine whether the particle
impact drilling effect is good or bad is the particle injection
device. The conventional particle injection device generally adopts
the single high-pressure tank injection structure, which is unable
to realize the particle continuous injection; in addition, because
the high-pressure tank has the relatively heavy weight and large
volume, the transportation is inconvenient, the high-pressure area
has a wide coverage, and the safety risk is high; moreover, the
pressure withstood by per unit floor area is high and the
foundation needs to be strengthened through the cement
solidification, which is time-consuming and has the high cost.
Therefore, it is urgent to produce an injection device which is
able to realize the particle continuous injection, is convenient to
transport and has the high safety, so as to meet the on-site
demands.
[0004] The Chinese patent publication of CN 203742449U, published
on Jul. 30, 2014, disclosed a particle vertical injection device,
comprising a high-pressure container, wherein: an inlet pipe is
arranged at the upper part of the high-pressure container; an
outlet pipe is arranged at the lower part of the high-pressure
container; an inclined discharge port is arranged on the outlet
pipe; a rotation shaft is arranged inside the high-pressure
container; helical teeth are arranged on the rotation shaft; an
upper sealing member and a lower sealing member are arranged
respectively between the rotation shaft and the top part of the
high-pressure container and between the rotation shaft and the
bottom part of the high-pressure container; bearings are arranged
between the upper sealing member and the rotation shaft and between
the lower sealing member and the rotation shaft; an upper end cover
and a lower end cover are arranged respectively at the outer sides
of the upper and lower bearings; a pressure relief hole is axially
provided on the upper end cover; a bottom part of the rotation
shaft is connected to a motor through a shaft coupling; the motor
is fixed on an outrigger through a support rod; the high-pressure
container is fixed on the outrigger; the inclined discharge port is
connected to a high-pressure hydraulic valve; and the high-pressure
hydraulic valve is connected with a high-pressure tee. The
disclosed particle vertical injection device enables the particles
to fall down evenly and avoids the particles being accumulated at
the bottom part of the high-pressure container. However, the
adopted single high-pressure container is merely able to realize
the particle intermittent injection and unable to realize the
particle continuous injection; the adopted high-pressure container
has the relatively high weight and large volume, so that the
pressure withstood by per unit floor area is high and the
foundation needs to be strengthened through the cement
solidification, which is time-consuming, expensive and inconvenient
to transport; moreover, the high-pressure area of the device has a
wide coverage, and the safety risk is high.
[0005] The Chinese patent publication of CN 103195363A, disclosed
on Jul. 10, 2013, disclosed a negative-jet-typed particle impact
drilling injection device, comprising a high-pressure particle
injection tank, wherein: a feed port is arranged at a top part of
the high-pressure particle injection tank and a discharge port is
arranged at a bottom part of the high-pressure particle injection
tank; a balance pressure jet pipe is arranged at a side of the feed
port; a jet anti-blocking sprayer is arranged at one end of the
balance pressure jet pipe, and the other end of the balance
pressure jet pipe is arranged at a top part of a main pipe; the jet
anti-blocking sprayer is arranged at the bottom part of the
high-pressure particle injection tank; a negative-pressure particle
injection pipe is arranged at a bottom part of the discharge port;
a nozzle is arranged at an end of the negative-pressure particle
injection pipe and is interconnected with the main pipe; an
adjusting pipe is arranged at a bottom part of the main pipe, and
an end of the adjusting pipe is interconnected with an outlet of
the negative-pressure particle injection pipe; and an adjusting
valve is arranged inside the adjusting pipe. The disclosed
negative-jet-typed particle impact drilling injection device adopts
an automatically rotational jet anti-blocking sprayer, which
realizes the omnidirectional multi-angle stirring of the discharge
port of the high-pressure particle injection tank and is able to
solve the blocking problem at the bottom part of the high-pressure
particle injection tank. However, the adopted single high-pressure
container is merely able to realize the particle intermittent
injection and unable to realize the particle continuous injection;
the adopted high-pressure container has the relatively high weight
and large volume, so that the pressure withstood by per unit floor
area is high and the foundation needs to be strengthened through
the cement solidification, which is time-consuming, expensive and
inconvenient to transport; moreover, the high-pressure area of the
device has a wide coverage, and the safety risk is high.
[0006] The Chinese patent publication of CN 102619468A, published
on Aug. 1, 2012, disclosed a particle impact drilling injection
device, comprising a ground high-pressure main pipeline, a flow
diversion pipeline, a flow diversion pipeline control valve, a
steel particle storage tank, a hydraulic (or manual) charging
valve, a storage tank pressure relief pipeline, a storage tank
pressure relief control valve, steel particles, a screw propeller,
a steel particle injection control valve and a flow limiting
device, wherein: the flow limiting device is arranged behind the
flow diversion pipeline; the flow diversion pipeline control valve
is arranged between the ground high-pressure main pipeline and the
steel particle storage tank; the storage tank pressure relief
control valve is arranged between the steel particle storage tank
and a drilling liquid pool; the screw propeller is arranged below
the steel particle storage tank; and the steel particle injection
control valve is arranged between the screw propeller and the
ground high-pressure main pipeline. The disclosed particle impact
drilling injection device adopts a left set and a right set of
injection devices which are completely same and mutually
independent. Through the alternate and repeated operation of the
two sets of the injection devices, the particle continuous
injection is realized. However, in the actual application, the
particles in the screw propeller of the injection device are easy
to be agglomerated and block the screw propeller, so that it is
failed to realize the normal injection of the particles; the
adopted steel particle storage tank has the relatively high weight
and large volume, so that the pressure withstood by per unit floor
area is high and the foundation needs to be strengthened through
the cement solidification, which is time-consuming, expensive and
inconvenient to transport; moreover, the high-pressure area of the
device has a wide coverage, and the safety risk is high.
[0007] In recent years, the particle drilling method has been
widely applied. The main related devices of the particle drilling
method are the injection device and the recovery device, wherein
the recovery device mainly comprise a drilling crew vibrating
screen, a jet mixer, a magnetic separator, a vibrating screen, a
rock debris storage hopper, a slurry tank and a static storage
tank. The whole drilling process comprises steps of: injecting the
mixture of particles and slurry into the well through the injection
device for drilling; the mixture of particles, rock debris and
slurry returned from the well passing respectively through the
drilling crew vibrating screen, the jet mixture and the magnetic
separator; separating the particles from the mixture of rock debris
and slurry by the magnetic separator, and pumping the particles
into the static storage tank for reservation; after the remaining
mixture of rock debris and slurry passes through the vibrating
screen for being screened, the rock debris falling into the rock
debris storage hopper, and the slurry falling into the slurry tank
for reservation; and finishing a drilling circulation.
[0008] Through the above particle drilling method, the jet mixer,
the vibrating screen, the rock debris storage hopper of the
recovery device and the associated low-pressure pipeline easily
lead to the leakage of the drilling fluid, causing the
environmental pollution; moreover, the number of the required
devices is large, the installation positions of the devices are
dispersed, the installation is complex, the time consumption is
relatively long, and the maintenance cost is relatively high.
[0009] The Chinese patent publication of CN 102022078A, published
on Apr. 20, 2011, disclosed a new drilling method. The pump-out
pipeline of the drilling pump is connected to a set of particle
injection system, so that the high-pressure slurry to be injected
into the well is continuously mixed with the hard particles having
the particle diameter in a range of 2-8 mm, then flows down along
the drill column to the drill bit, and accelerates at the bit port
to hit the rock at a greatly high speed, thereby achieving the
combined rock breaking effect of mechanical engineering and
particle impact and increasing the drilling speed at the hard
formation. The slurry return pipeline at the well mouth is
connected to a set of particle separating system, so that the metal
particles are separated from the mixed liquid returned from the
well bottom for recycling.
[0010] According to the above disclosed drilling method, in order
to increase the particle injection efficiency, two sets of the
injection devices which are able to work independently are adopted.
However, the number of the involved devices is relatively large,
the structure is complex, the installation is inconvenient, and the
operation is not easy. The particles in the involved screw
propeller are easy to be agglomerated and block the screw
propeller, so that it is failed to realize the normal injection of
the particles; the adopted injection devices have the relatively
high weight and large volume, so that the pressure withstood by per
unit floor area is high and the foundation needs to be strengthened
through the cement solidification, which is time-consuming,
expensive and inconvenient to transport; the high-pressure area of
the devices has a wide coverage, and the safety risk is high; the
two sets of injection devices are independent to each other and
unable to be organically connected together, which increases the
cooperation difficulty between the particle separating system and
the particle transporting system and substantially limits the
particle drilling efficiency.
SUMMARY OF THE PRESENT INVENTION
[0011] An object of the present invention is to provide a particle
drilling method to solve above defects in prior arts. The present
invention enables a mixture of particles, rock debris and slurry
returned from a well to directly flow into a magnetic separator
through an exit device at a well mouth with utilizing liquid
energy, so as to separate and storage the particles, which
effective solves a problem of many slurry leakage points in the
prior arts caused by directly pumping the rock debris and the
slurry into a drilling crew vibrating screen and greatly decreases
an environmental pollution risk.
[0012] The present invention is realized through following
technical solutions.
[0013] A particle drilling method comprises steps of particle
injection and particle recovery, wherein:
[0014] the step of particle injection specifically comprises a step
of injecting slurry and particles into a well through an injection
device;
[0015] the step of particle recovery specifically comprises steps
of: enabling a mixture of particles, rock debris and slurry
returned from the well to directly flow into a recovery device by a
pipeline through an exit device at a well mouth of a drill floor
with liquid energy; sending separated particles into a storage tank
by a magnetic separator of the recovery device; and sending a
mixture of rock debris and slurry into a slurry tank; and
[0016] after the steps of particle injection and particle recovery,
the particles in the storage tank are transported to the injection
device and then injected into the well through the injection device
for drilling again, so as to form a particle impact drilling
circulation.
[0017] In the step of particle injection, a particle injection
speed is 0.5-10 kg/s.
[0018] In the step of particle injection, a particle injection
pressure is 5-55 MPa.
[0019] The storage tank is a rotational storage tank, comprising a
tank body, blades arranged in the tank body, a support frame, a
screen barrel and a motor driving the tank body to rotate, wherein:
the blades and the support frame are fixed on an inner wall of the
tank body; and the screen barrel is connected with the blades
through the support frame.
[0020] The injection device is a double-injection-pump continuous
injection device, comprising a particle mixing hopper which is
connected with a drilling vertical pipe through a high-pressure
pipeline, wherein: a reversing pipe is arranged in the particle
mixing hopper; the reversing pipe is connected with a swinging
hydraulic cylinder which drives the reversing pipe to swing from
left to right; a first transporting cylinder and a second
transporting cylinder are connected with the particle mixing
hopper; a first end of the reversing pipe is interconnected with
the high-pressure pipeline, and a second end of the reversing pipe
is interconnected with the first transporting cylinder or the
second transporting cylinder. When injecting the particles, a first
hydraulic cylinder, a second hydraulic cylinder and the swinging
hydraulic cylinder are firstly started; the first hydraulic
cylinder starts an addition stroke, the swinging hydraulic cylinder
swings the reversing pipe to the second transporting cylinder so
that the reversing pipe is interconnected with the second
transporting cylinder, and the particles and the slurry enter the
first transporting cylinder; meanwhile, the second hydraulic
cylinder starts a compression stroke that the particles and the
slurry in the second transporting cylinder are injected into the
high-pressure pipe through the reversing pipe to enter an inner
well circulation; the first hydraulic cylinder starts a compression
stroke after ending the addition stroke, and the second hydraulic
cylinder starts an addition stroke, so as to continuously inject
the particles through an alternate operation.
[0021] The swinging hydraulic cylinder comprises cylinder bodies,
pistons, piston rods, a swinging rod and a spline connected with
the swinging rod, wherein: the pistons are connected with the
swinging rod through the respective piston rods; and the reversing
pipe is connected with the spline.
[0022] The high-pressure pipeline is connected with an arrow-shaped
check valve.
[0023] The slurry tank consists of a cylindrical tank body and a
conical tank body, wherein the conical tank body is arranged below
the cylindrical tank body; and, the conical tank body and the
cylindrical tank body are integrated together.
[0024] The exit device comprises a rotational sprayer and a
rotational control head connected with the rotational sprayer.
[0025] Working principles of the present invention are described as
follows.
[0026] During the particle impact drilling process, the separated
and stored particles in the recovery device of particle drilling
are firstly added into the particle mixing hopper through a screw
conveyor, wherein an addition speed of the particles is controlled
through a screw rotation speed of the screw conveyor; the slurry is
pumped into the particle mixing hopper through a slurry pump; an
occupied volume of a mixture of particles and slurry in the
particle mixing hopper is maintained at 1/2-2/3 of the volume of
the particle mixing hopper; when the occupied volume of the mixture
of particles and slurry reaches 1/2 of the volume of the particle
mixing hopper, the first hydraulic cylinder and the second
hydraulic cylinder are started; the first hydraulic cylinders
starts the addition stroke, meanwhile the swinging hydraulic
cylinder is started and swings the reversing pipe to the second
transporting cylinder so that the reversing pipe is rapidly
interconnected with the second transporting cylinder, and the
mixture of particles and slurry in the particle mixing hopper is
added into the first transporting cylinder; at the same time, the
second hydraulic cylinder starts the compression stroke and
extrudes the mixture of particles and slurry which comes from the
particle mixing hopper and is stored in the second transporting
cylinder, the mixture of particles and slurry is injected into the
high-pressure pipeline through the reversing pipe and finally
enters the inner well circulation; when a second piston moves to a
limiting position, the second hydraulic cylinders ends the
compression stroke and starts the addition stroke, the swinging
hydraulic cylinder swings the reversing pipe to the first
transporting cylinder so that the reversing pipe is interconnected
with the first transporting cylinder, the first hydraulic cylinders
ends the addition stroke and starts the compression stroke, and the
mixture of particles and slurry in the first transporting cylinder
is injected into the high-pressure pipeline through the reversing
pipe, so as to finally enter the inner well circulation, which
realizes the alternate operation of the first transporting cylinder
and the second transporting cylinder and enables the particles to
be continuously injected into the well; the mixture of slurry, rock
debris and particles, returned from the well, directly flows into
the magnetic separator through the rotational control head and the
pipeline, the magnetic separator separates the particles from the
mixture of slurry, rock debris and particles and transports the
separated particles to the rotational storage tank for storage
through a horizontal conveyor, the rock debris and the slurry fall
down into the slurry tank below the magnetic separator, and the
mixture of rock debris and slurry in the slurry tank is directly
pumped into the drilling crew vibrating screen through the slurry
pump and the pipeline, thereby realizing the separation and
recovery of the particles; the separated particles are stored in
the rotational storage tank and then directly pumped into the
particle mixing hopper through the screw conveyor. Through the
above process, recycling of the particles during the whole drilling
process is realized.
[0027] Beneficial effects of the present invention are mainly shown
in following aspects.
[0028] Firstly, according to the present invention, the step of
particle injection is to inject the slurry and the particles into
the well through the injection device; the step of particle
recovery is to enable the mixture of particles, rock debris and
slurry returned from the well to directly flow into the recovery
device by the pipeline through the exit device at the well mouth of
the drill floor with the liquid energy, then send the separated
particles into the storage tank by the magnetic separator of the
recovery device, and send the mixture of rock debris and slurry
into the slurry tank; after the steps of particle injection and
particle recovery, the particles in the storage tank are
transported to the injection device and injected into the well
through the injection device for drilling again, so as to form the
particle impact drilling circulation. Through the step of particle
recovery, the mixture of particles, rock debris and slurry returned
from the well directly flows into the magnetic separator of the
recovery device for particle separation, which simplifies a
particle screening process. Because the slurry and the rock debris
do not contain ferromagnetic materials, the particles are easily
separated by the magnetic separator, having advantages of high
separation efficiency and good separation effect. After separating
the particles, the magnetic separator directly transports the
separated particles to the storage tank for recycling. Compared
with the prior arts, under a premise of not changing a conventional
drilling process, a particle recovery process is simplified;
devices which easily cause a slurry leakage, such as a jet mixer,
an associated low-pressure pipeline, a vibrating screen and a rock
debris storage hopper, are avoided; an installation efficiency, an
operation convenience and a maintenance convenience of the recovery
system are effectively improved; a working efficiency of particle
impact drilling is greatly increased; a problem of many slurry
leakage points, caused by firstly pumping the mixture of rock
debris and slurry into the drilling crew vibrating screen and then
transporting to the recovery device, is effectively solved; and an
environmental pollution risk is greatly reduced.
[0029] Secondly, according to the present invention, in the step of
particle injection, the particle injection speed is 0.5-10 kg/s;
through adopting the specific injection speed, performance of
drilling fluid during the drilling process is guaranteed; and at
the specific injection speed, a particle impact frequency of the
particles hitting the rock is larger than 10 million times per
minute, which achieves a good impact rock breaking effect and
increases a drilling efficiency.
[0030] Thirdly, according to the present invention, in the step of
particle injection, the particle injection pressure is 5-55 MPa; at
the specific pressure range, the injection speed of the particles
is effectively guaranteed, the drilling efficiency is increased,
the drilling vertical pipe is effectively avoided being damaged,
and a working stability of particle drilling is guaranteed.
[0031] Fourthly, according to the present invention, the storage
tank is the rotational storage tank, comprising the tank body, the
blades in the tank body, the support frame, the screen barrel and
the motor driving the tank body to rotate, wherein: the blades and
the support frame are fixed on the inner wall of the tank body; and
the screen barrel is connected with the blades through the support
frame. Through the rotational storage tank having the unique
structure, when rotating positively, dynamic storage is realized,
and the particles are avoided being agglomerated during a
rotational storage process; when rotating negatively, particle
discharging is realized, and the blades enable the particles to be
uniformly discharged out.
[0032] Fifthly, according to the present invention, the injection
device is the double-injection-pump continuous injection device,
comprising the particle mixing hopper which is connected with the
drilling vertical pipe through the high-pressure pipeline, wherein:
the reversing pipe is arranged in the particle mixing hopper; the
reversing pipe is connected with the swinging hydraulic cylinder
which drives the reversing pipe to swing from left to right; the
first transporting cylinder and the second transporting cylinder
are connected with the particle mixing hopper; the first end of the
reversing pipe is interconnected with the high-pressure pipeline,
and the second end of the reversing pipe is interconnected with the
first transporting cylinder or the second transporting cylinder.
When injecting the particles, the first hydraulic cylinder, the
second hydraulic cylinder and the swinging hydraulic cylinder are
firstly started; the first hydraulic cylinder starts the addition
stroke, the swinging hydraulic cylinder swings the reversing pipe
to the second transporting cylinder so that the reversing pipe is
interconnected with the second transporting cylinder, and the
particles and the slurry enter the first transporting cylinder;
meanwhile, the second hydraulic cylinder starts the compression
stroke that the particles and the slurry in the second transporting
cylinder are injected into the high-pressure pipeline through the
reversing pipe to enter the inner well circulation; the first
hydraulic cylinder starts the compression stroke after ending the
addition stroke, and the second hydraulic cylinder starts the
addition stroke, so that the continuous injection is realized
through the alternate operation, which guarantees a continuity of
particle injection in the well, avoids the first transporting
cylinder and the second transporting cylinder being blocked due to
particle deposition, and effectively increases the working
efficiency of particle impact drilling. In the
double-injection-pump continuous injection device, merely the first
transporting cylinder, the second transporting cylinder and the
reversing pipe are in a high-pressure state. Compared with the
prior arts, the injection device with the high-pressure tank and
the associated screw conveyor is replaced, the injection process is
optimized, the problem of the particle intermittent injection of
the single high-pressure tank is solved, and the particle
continuous injection is realized. Meanwhile, the problem of the
difficult particle injection caused by easily agglomerated and
blocked particles in the screw conveyor and the problems of the
inconvenient transportation, installation and operation, the time
consumption and the high cost caused by the relatively heavy weight
and large volume of the associated device of the high-pressure tank
are solved, the working efficiency of particle drilling is
increased, the high-pressure area of the injection device is
greatly reduced, and the safety is improved.
[0033] Sixthly, according to the present invention, the swinging
hydraulic cylinder comprises the cylinder bodies, the pistons, the
piston rods, the swinging rod and the spline connected with the
swinging rod, wherein the pistons are connected with the swinging
rod through the respective piston rods; and the reversing pipe is
connected with the spline. Through the swinging hydraulic cylinder
having the above specific structure, the swinging rod enables the
reversing pipe to change a direction flexibly, having an advantage
of flexibly reversing; and moreover, through structures of the
spline and the swinging rod, a service life is lengthened.
[0034] Seventhly, according to the present invention, the
arrow-shaped check valve is connected with the high-pressure
pipeline. Through adopting the arrow-shaped check valve, the
mixture of particles and slurry is able to smoothly enter the well
through the high-pressure pipeline; and, the mixture of particles
and slurry is avoided reversely entering the first transporting
cylinder or the second transporting cylinder, which effectively
avoids a damage to people caused by the slurry leakage during the
particle injection process and further improves the safety.
BRIEF DESCRIPTION OF THE DRAWINGS
[0035] FIG. 1 is a structural sketch view of a drilling device
according to the present invention.
[0036] FIG. 2 is a structural sketch view of a connection between a
double-injection-pump continuous injection device and a drill floor
according to the present invention.
[0037] FIG. 3 is a structural sketch view of a swinging hydraulic
cylinder according to the present invention.
[0038] FIG. 4 is a structural sketch view of a connection between a
double-injection-pump continuous injection device and the drill
floor according to a fourth preferred embodiment of the present
invention.
[0039] FIG. 5 is a structural sketch view of a reversing pipe
according to a fifth preferred embodiment of the present
invention.
[0040] FIG. 6 is a structural sketch view of a rotational storage
tank according to a sixth preferred embodiment of the present
invention.
[0041] In figures: 1: first hydraulic cylinder; 2: second hydraulic
cylinder; 3: swinging hydraulic cylinder; 4: reversing pipe; 5:
first piston; 6: first transporting cylinder; 7: second piston; 8:
second transporting cylinder; 9: high-pressure pipeline; 10:
magnetic separator; 11: slurry tank; 12: rotational storage tank;
13: cylinder body; 14: piston; 15: piston rod; 16: swinging rod;
17: spline; 18: arrow-shaped check valve; 19: seal ring; 20: tank
body; 21: blade; 22: support frame; 23: screen barrel; 24: motor;
25: particle mixing hopper; 26: rotational control head; 27:
rotational sprayer; and 28: exit device.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
First Preferred Embodiment
[0042] Referring to FIG. 1, a particle drilling method comprises
steps of particle injection and particle recovery, wherein: the
step of particle injection is to inject slurry and particles into a
well through an injection device; the step of particle recovery is
to enable a mixture of particles, rock debris and slurry returned
from the well to directly flow into a recovery device by a pipeline
through an exit device 28 at a well mouth of a drill floor with
liquid energy, then send separated particles into a storage tank by
a magnetic separator 10 of the recovery device, and send a mixture
of rock debris and slurry into a slurry tank 11; after the steps of
particle injection and particle recovery, the particles in the
storage tank are transported to the injection device and injected
into the well through the injection device for drilling again, so
as to form a particle impact drilling circulation.
[0043] The first preferred embodiment illustrates a most basic
implementation method, and the adopted injection device and storage
tank are conventional. Through the step of particle recovery, the
mixture of particles, rock debris and slurry returned from the well
directly flows into the magnetic separator of the recovery device
for particle separation, which simplifies a particle screening
process. Because the slurry and the rock debris do not contain
ferromagnetic materials, the particles are easily separated by the
magnetic separator, having advantages of high separation efficiency
and good separation effect. After separating the particles, the
magnetic separator directly transports the separated particles to
the storage tank for recycling. Compared with the prior arts, under
a premise of not changing a conventional drilling process, a
particle recovery process is simplified; devices which easily cause
a slurry leakage, such as a jet mixer, an associated low-pressure
pipeline, a vibrating screen and a rock debris storage hopper, are
avoided; an installation efficiency, an operation convenience and a
maintenance convenience of the recovery system are effectively
improved; a working efficiency of particle impact drilling is
greatly increased; a problem of many slurry leakage points, caused
by firstly pumping the mixture of rock debris and slurry into a
drilling crew vibrating screen and then transporting to the
recovery device, is effectively solved; and an environmental
pollution risk is greatly reduced.
Second Preferred Embodiment
[0044] Referring to FIG. 1 and FIG. 2, a particle drilling method
comprises steps of particle injection and particle recovery,
wherein: the step of particle injection is to inject slurry and
particles into a well through an injection device; the step of
particle recovery is to enable a mixture of particles, rock debris
and slurry returned from the well to directly flow into a recovery
device by a pipeline through an exit device 28 at a well mouth of a
drill floor with liquid energy, then send separated particles into
a storage tank by a magnetic separator 10 of the recovery device,
and send a mixture of rock debris and slurry into a slurry tank 11;
after the steps of particle injection and particle recovery, the
particles in the storage tank are transported to the injection
device and injected into the well through the injection device for
drilling again, so as to form a particle impact drilling
circulation.
[0045] In the step of particle injection, a particle injection
speed is 0.5 kg/s.
[0046] In the step of particle injection, a particle injection
pressure is 5 MPa.
[0047] The injection device is a double-injection-pump continuous
injection device, comprising a first hydraulic cylinder 1, a second
hydraulic cylinder 2, a swinging hydraulic cylinder 3, a reversing
pipe 4, a first piston 5, a first transporting cylinder 6, a second
piston 7 and a second transporting cylinder 8, and further
comprising a particle mixing hopper 25 which is connected with a
drilling vertical pipe through a high-pressure pipeline 9, wherein:
the reversing pipe 4 is arranged in the particle mixing hopper 25;
the reversing pipe 4 is connected with the swinging hydraulic
cylinder 3 which drives the reversing pipe 4 to swing from left to
right; the particle mixing hopper 25 is connected with the first
transporting cylinder 6 and the second transporting cylinder 7; the
first hydraulic cylinder 1, the second hydraulic cylinder 2 and the
swinging hydraulic cylinder 3 are firstly started; the first
hydraulic cylinder 1 starts an addition stroke, the swinging
hydraulic cylinder 3 swings the reversing pipe 4 to the second
transporting cylinder 8 so that the reversing pipe is
interconnected with the second transporting cylinder, and a mixture
of particles and slurry enters the first transporting cylinder 6;
meanwhile, the second hydraulic cylinder 2 starts a compression
stroke that a mixture of particles and slurry in the second
transporting cylinder 8 is injected into the high-pressure pipeline
9 through the reversing pipe 4 to enter an inner well circulation;
the first hydraulic cylinder 1 starts a compression stroke after
ending the addition stroke, and the second hydraulic cylinder 2
starts an addition stroke, so that a continuous injection is
realized through an alternate operation.
[0048] According to the second preferred embodiment, when injecting
the particles, the first hydraulic cylinder, the second hydraulic
cylinder and the swinging hydraulic cylinder are firstly started;
the first hydraulic cylinder starts the addition stroke, the
swinging hydraulic cylinder swings the reversing pipe to the second
transporting cylinder so that the reversing pipe is interconnected
with the second transporting cylinder, and the particles and the
slurry enter the first transporting cylinder; meanwhile, the second
hydraulic cylinder starts the compression stroke that the particles
and the slurry in the second transporting cylinder are injected
into the high-pressure pipeline through the reversing pipe to enter
the inner well circulation; the first hydraulic cylinder starts the
compression stroke after ending the addition stroke, and the second
hydraulic cylinder starts the addition stroke, so that the
continuous injection is realized through the alternate operation,
which guarantees a continuity of particle injection in the well,
avoids the first transporting cylinder and the second transporting
cylinder being blocked due to particle deposition, and effectively
increases a working efficiency of particle impact drilling. In the
double-injection-pump continuous injection device, merely the first
transporting cylinder, the second transporting cylinder and the
reversing pipe are in a high-pressure state, which greatly reduces
a high-pressure area and improves safety.
Third Preferred Embodiment
[0049] Referring to FIG. 1, FIG. 3 and FIG. 4, a particle drilling
method comprises steps of particle injection and particle recovery,
wherein: the step of particle injection is to inject slurry and
particles into a well through an injection device; the step of
particle recovery is to enable a mixture of particles, rock debris
and slurry returned from the well to directly flow into a recovery
device by a pipeline through an exit device 28 at a well mouth of a
drill floor with liquid energy, then send separated particles into
a storage tank by a magnetic separator 10 of the recovery device,
and send a mixture of rock debris and slurry into a slurry tank 11;
after the steps of particle injection and particle recovery, the
particles in the storage tank are transported to the injection
device and injected into the well through the injection device for
drilling again, so as to form a particle impact drilling
circulation.
[0050] In the step of particle injection, a particle injection
speed is 2 kg/s.
[0051] In the step of particle injection, a particle injection
pressure is 20 MPa.
[0052] The injection device is a double-injection-pump continuous
injection device, comprising a first hydraulic cylinder 1, a second
hydraulic cylinder 2, a swinging hydraulic cylinder 3, a reversing
pipe 4, a first piston 5, a first transporting cylinder 6, a second
piston 7 and a second transporting cylinder 8, and further
comprising a particle mixing hopper 25 which is connected with a
drilling vertical pipe through a high-pressure pipeline 9, wherein:
the reversing pipe 4 is arranged in the particle mixing hopper 25;
the reversing pipe 4 is connected with the swinging hydraulic
cylinder 3 which drives the reversing pipe 4 to swing from left to
right; the particle mixing hopper 25 is connected with the first
transporting cylinder 6 and the second transporting cylinder 7; the
first hydraulic cylinder 1, the second hydraulic cylinder 2 and the
swinging hydraulic cylinder 3 are firstly started; the first
hydraulic cylinder 1 starts an addition stroke, the swinging
hydraulic cylinder 3 swings the reversing pipe 4 to the second
transporting cylinder 8 so that the reversing pipe is
interconnected with the second transporting cylinder, and a mixture
of particles and slurry enters the first transporting cylinder 6;
meanwhile, the second hydraulic cylinder 2 starts a compression
stroke that a mixture of particles and slurry in the second
transporting cylinder 8 is injected into the high-pressure pipeline
9 through the reversing pipe 4 to enter an inner well circulation;
the first hydraulic cylinder 1 starts a compression stroke after
ending the addition stroke, and the second hydraulic cylinder 2
starts an addition stroke, so that a continuous injection is
realized through an alternate operation.
[0053] The swinging hydraulic cylinder 3 comprises cylinder bodies
13, pistons 14, piston rods 15, a swinging rod 16 and a spline 17
connected with the swinging rod 16, wherein: the pistons 14 are
connected with the swinging rod 16 through the respective piston
rods 15; and the reversing pipe 4 is connected with the spline
17.
[0054] An arrow-shaped check valve 18 is connected with the
high-pressure pipeline 9.
[0055] According to the third preferred embodiment, the swinging
hydraulic cylinder comprises the cylinder bodies, the pistons, the
piston rods, the swinging rod and the spline connected with the
swinging rod, wherein the pistons are connected with the swinging
rod through the respective piston rods; and the reversing pipe is
connected with the spline. Through the swinging hydraulic cylinder
having the above specific structure, the swinging rod enables the
reversing pipe to change a direction flexibly, having an advantage
of flexibly reversing; and moreover, through structures of the
spline and the swinging rod, a service life is lengthened. The
arrow-shaped check valve is connected with the high-pressure
pipeline. With the arrow-shaped check valve, the mixture of
particles and slurry is able to smoothly enter the well through the
high-pressure pipeline; and, the mixture of particles and slurry is
avoided reversely entering the first transporting cylinder or the
second transporting cylinder, which effectively avoids a damage to
people caused by a slurry leakage during a particle injection
process and further improves safety.
Fourth Preferred Embodiment
[0056] Referring to FIG. 1, FIG. 3, FIG. 4 and FIG. 5, a particle
drilling method comprises steps of particle injection and particle
recovery, wherein: the step of particle injection is to inject
slurry and particles into a well through an injection device; the
step of particle recovery is to enable a mixture of particles, rock
debris and slurry returned from the well to directly flow into a
recovery device by a pipeline through an exit device 28 at a well
mouth of a drill floor with liquid energy, then send separated
particles into a storage tank by a magnetic separator 10 of the
recovery device, and send a mixture of rock debris and slurry into
a slurry tank 11; after the steps of particle injection and
particle recovery, the particles in the storage tank are
transported to the injection device and injected into the well
through the injection device for drilling again, so as to form a
particle impact drilling circulation.
[0057] In the step of particle injection, a particle injection
speed is 6 kg/s.
[0058] In the step of particle injection, a particle injection
pressure is 30 MPa.
[0059] The injection device is a double-injection-pump continuous
injection device, comprising a first hydraulic cylinder 1, a second
hydraulic cylinder 2, a swinging hydraulic cylinder 3, a reversing
pipe 4, a first piston 5, a first transporting cylinder 6, a second
piston 7 and a second transporting cylinder 8, and further
comprising a particle mixing hopper 25 which is connected with a
drilling vertical pipe through a high-pressure pipeline 9, wherein:
the reversing pipe 4 is arranged in the particle mixing hopper 25;
the reversing pipe 4 is connected with the swinging hydraulic
cylinder 3 which drives the reversing pipe 4 to swing from left to
right; the particle mixing hopper 25 is connected with the first
transporting cylinder 6 and the second transporting cylinder 7; the
first hydraulic cylinder 1, the second hydraulic cylinder 2 and the
swinging hydraulic cylinder 3 are firstly started; the first
hydraulic cylinder 1 starts an addition stroke, the swinging
hydraulic cylinder 3 swings the reversing pipe 4 to the second
transporting cylinder 8 so that the reversing pipe is
interconnected with the second transporting cylinder, and a mixture
of particles and slurry enters the first transporting cylinder 6;
meanwhile, the second hydraulic cylinder 2 starts a compression
stroke that a mixture of particles and slurry in the second
transporting cylinder 8 is injected into the high-pressure pipeline
9 through the reversing pipe 4 to enter an inner well circulation;
the first hydraulic cylinder 1 starts a compression stroke after
ending the addition stroke, and the second hydraulic cylinder 2
starts an addition stroke, so that a continuous injection is
realized through an alternate operation.
[0060] The swinging hydraulic cylinder 3 comprises cylinder bodies
13, pistons 14, piston rods 15, a swinging rod 16 and a spline 17
connected with the swinging rod 16, wherein: the pistons 14 are
connected with the swinging rod 16 through the respective piston
rods 15; and the reversing pipe 4 is connected with the spline
17.
[0061] An arrow-shaped check valve 18 is connected with the
high-pressure pipeline 9.
[0062] Furthermore, the first hydraulic cylinder 1 and the second
hydraulic cylinder 2 are both dual-rod hydraulic cylinders; two
seal rings 19 are connected with the reversing pipe 4 and
respectively arranged at two ends of the reversing pipe 4.
[0063] According to the fourth preferred embodiment, the first
hydraulic cylinder and the second hydraulic cylinder are both
dual-rod hydraulic cylinders, so that a uniform reciprocating
motion is realized, synchronization between the addition stoke and
the compression stroke is easily realized, and a stability of
particle continuous injection into the well is improved, thereby
guaranteeing a working efficiency of particle drilling. Two seal
rings are connected with the reversing pipe and respectively
arranged at the two ends of the reversing pipe. When the reversing
pipe is interconnected with the first transporting cylinder or the
second transporting cylinder, the seal rings are able to avoid a
pressure leakage in the first transporting cylinder or the second
transporting cylinder, so that the addition stroke and the
compression stoke proceed stably and the particles are guaranteed
to be smoothly injected into the well.
Fifth Preferred Embodiment
[0064] Referring to FIG. 1, FIG. 3, FIG. 4 and FIG. 5, a particle
drilling method comprises steps of particle injection and particle
recovery, wherein: the step of particle injection is to inject
slurry and particles into a well through an injection device; the
step of particle recovery is to enable a mixture of particles, rock
debris and slurry returned from the well to directly flow into a
recovery device by a pipeline through an exit device 28 at a well
mouth of a drill floor with liquid energy, then send separated
particles into a storage tank by a magnetic separator 10 of the
recovery device, and send a mixture of rock debris and slurry into
a slurry tank 11; after the steps of particle injection and
particle recovery, the particles in the storage tank are
transported to the injection device and injected into the well
through the injection device for drilling again, so as to form a
particle impact drilling circulation.
[0065] In the step of particle injection, a particle injection
speed is 8 kg/s.
[0066] In the step of particle injection, a particle injection
pressure is 40 MPa.
[0067] The injection device is a double-injection-pump continuous
injection device, comprising a first hydraulic cylinder 1, a second
hydraulic cylinder 2, a swinging hydraulic cylinder 3, a reversing
pipe 4, a first piston 5, a first transporting cylinder 6, a second
piston 7 and a second transporting cylinder 8, and further
comprising a particle mixing hopper 25 which is connected with a
drilling vertical pipe through a high-pressure pipeline 9, wherein:
the reversing pipe 4 is arranged in the particle mixing hopper 25;
the reversing pipe 4 is connected with the swinging hydraulic
cylinder 3 which drives the reversing pipe 4 to swing from left to
right; the particle mixing hopper 25 is connected with the first
transporting cylinder 6 and the second transporting cylinder 7; the
first hydraulic cylinder 1, the second hydraulic cylinder 2 and the
swinging hydraulic cylinder 3 are firstly started; the first
hydraulic cylinder 1 starts an addition stroke, the swinging
hydraulic cylinder 3 swings the reversing pipe 4 to the second
transporting cylinder 8 so that the reversing pipe is
interconnected with the second transporting cylinder, and a mixture
of particles and slurry enters the first transporting cylinder 6;
meanwhile, the second hydraulic cylinder 2 starts a compression
stroke that a mixture of particles and slurry in the second
transporting cylinder 8 is injected into the high-pressure pipeline
9 through the reversing pipe 4 to enter an inner well circulation;
the first hydraulic cylinder 1 starts a compression stroke after
ending the addition stroke, and the second hydraulic cylinder 2
starts an addition stroke, so that a continuous injection is
realized through an alternate operation.
[0068] The swinging hydraulic cylinder 3 comprises cylinder bodies
13, pistons 14, piston rods 15, a swinging rod 16 and a spline 17
connected with the swinging rod 16, wherein: the pistons 14 are
connected with the swinging rod 16 through the respective piston
rods 15; and the reversing pipe 4 is connected with the spline
17.
[0069] An arrow-shaped check valve 18 is connected with the
high-pressure pipeline 9.
[0070] The first hydraulic cylinder 1 and the second hydraulic
cylinder 2 are both dual-rod hydraulic cylinders; two seal rings 19
are connected with the reversing pipe 4 and respectively arranged
at two ends of the reversing pipe 4.
[0071] Furthermore, a cross section of the reversing pipe 4 is
"S"-shaped.
[0072] According to the fifth preferred embodiment, the cross
section of the reversing pipe is "S"-shaped. Through the specific
"S"-shaped reversing pipe, a reversing process becomes more
flexible and convenient. The reversing pipe is able to rapidly
connect with the first transporting cylinder or the second
transporting cylinder, so as to guarantee a continuity of particle
injection.
Sixth Preferred Embodiment
[0073] Referring to FIG. 1, FIG. 3, FIG. 4, FIG. 5 and FIG. 6, a
particle drilling method comprises steps of particle injection and
particle recovery, wherein: the step of particle injection is to
inject slurry and particles into a well through an injection
device; the step of particle recovery is to enable a mixture of
particles, rock debris and slurry returned from the well to
directly flow into a recovery device by a pipeline through an exit
device 28 at a well mouth of a drill floor with liquid energy, then
send separated particles into a storage tank by a magnetic
separator 10 of the recovery device, and send a mixture of rock
debris and slurry into a slurry tank 11; after the steps of
particle injection and particle recovery, the particles in the
storage tank are transported to the injection device and injected
into the well through the injection device for drilling again, so
as to form a particle impact drilling circulation.
[0074] In the step of particle injection, a particle injection
speed is 10 kg/s.
[0075] In the step of particle injection, a particle injection
pressure is 55 MPa.
[0076] The injection device is a double-injection-pump continuous
injection device, comprising a first hydraulic cylinder 1, a second
hydraulic cylinder 2, a swinging hydraulic cylinder 3, a reversing
pipe 4, a first piston 5, a first transporting cylinder 6, a second
piston 7 and a second transporting cylinder 8, and further
comprising a particle mixing hopper 25 which is connected with a
drilling vertical pipe through a high-pressure pipeline 9, wherein:
the reversing pipe 4 is arranged in the particle mixing hopper 25;
the reversing pipe 4 is connected with the swinging hydraulic
cylinder 3 which drives the reversing pipe 4 to swing from left to
right; the particle mixing hopper 25 is connected with the first
transporting cylinder 6 and the second transporting cylinder 7; the
first hydraulic cylinder 1, the second hydraulic cylinder 2 and the
swinging hydraulic cylinder 3 are firstly started; the first
hydraulic cylinder 1 starts an addition stroke, the swinging
hydraulic cylinder 3 swings the reversing pipe 4 to the second
transporting cylinder 8 so that the reversing pipe is
interconnected with the second transporting cylinder, and a mixture
of particles and slurry enters the first transporting cylinder 6;
meanwhile, the second hydraulic cylinder 2 starts a compression
stroke that a mixture of particles and slurry in the second
transporting cylinder 8 is injected into the high-pressure pipeline
9 through the reversing pipe 4 to enter an inner well circulation;
the first hydraulic cylinder 1 starts a compression stroke after
ending the addition stroke, and the second hydraulic cylinder 2
starts an addition stroke, so that a continuous injection is
realized through an alternate operation.
[0077] The swinging hydraulic cylinder 3 comprises cylinder bodies
13, pistons 14, piston rods 15, a swinging rod 16 and a spline 17
connected with the swinging rod 16, wherein: the pistons 14 are
connected with the swinging rod 16 through the respective piston
rods 15; and the reversing pipe 4 is connected with the spline
17.
[0078] An arrow-shaped check valve 18 is connected with the
high-pressure pipeline 9.
[0079] The first hydraulic cylinder 1 and the second hydraulic
cylinder 2 are both dual-rod hydraulic cylinders; two seal rings 19
are connected with the reversing pipe 4 and respectively arranged
at two ends of the reversing pipe 4.
[0080] A cross section of the reversing pipe 4 is "S"-shaped.
[0081] Furthermore, the storage tank is a rotational storage tank
12, comprising a tank body 20, blades 21 arranged in the tank body
20, a support frame 22, a screen barrel 23 and a motor 24 driving
the tank body 20 to rotate, wherein: the blades 21 and the support
frame 22 are fixed on an inner wall of the tank body 20; the screen
barrel 23 is connected with the blades 21 through the support frame
22.
[0082] Furthermore, the exit device 28 comprises a rotational
sprayer 27 and a rotational control head 26 connected with the
rotational sprayer 27.
[0083] According to the sixth preferred embodiment, the rotational
storage tank comprises the tank body, the blades in the tank body,
the support frame, the screen barrel and the motor driving the tank
body to rotate, wherein: the blades and the support frame are fixed
on the inner wall of the tank body; and the screen barrel is
connected with the blades through the support frame. Through the
rotational storage tank having the unique structure, when rotating
positively, dynamic storage is realized, and the particles are
avoided being agglomerated during a rotational storage process;
when rotating negatively, particle discharging is realized, and the
blades enable the particles to be uniformly discharged out. Through
the step of particle recovery, the mixture of particles, rock
debris and slurry returned from the well directly flows into the
magnetic separator of the recovery device through the rotational
control head 26 of the exit device 28 for particle separation,
which simplifies a particle screening process. Because the slurry
and the rock debris do not contain ferromagnetic materials, the
particles are easily separated by the magnetic separator, having
advantages of high separation efficiency and good separation
effect. After separating the particles, the magnetic separator
directly transports the separated particles to the storage tank for
recycling. Compared with the prior arts, under a premise of not
changing a conventional drilling process, a particle recovery
process is simplified; devices which easily cause a slurry leakage,
such as a jet mixer, an associated low-pressure pipeline, a
vibrating screen and a rock debris storage hopper, are avoided; an
installation efficiency, an operation convenience and a maintenance
convenience of the recovery system are effectively improved; a
working efficiency of particle impact drilling is greatly
increased; a problem of many slurry leakage points, caused by
firstly pumping the mixture of rock debris and slurry into a
drilling crew vibrating screen and then transporting to the
recovery device, is effectively solved; and an environmental
pollution risk is greatly reduced. Through adopting the specific
injection speed, performance of drilling fluid during the drilling
process is guaranteed; and at the specific injection speed, a
particle impact frequency of the particles hitting the rock is
larger than 10 million times per minute, which achieves a good
impact rock breaking effect and increases a drilling efficiency.
Under the specific injection pressure, the injection speed of the
particles is effectively guaranteed, the drilling efficiency is
increased, a drilling vertical pipe is effectively avoided being
damaged, and a working stability of particle drilling is
guaranteed.
* * * * *