U.S. patent application number 16/646471 was filed with the patent office on 2021-03-04 for device and working method for drilling hydrate micro-borehole and performing fast completion.
The applicant listed for this patent is CHINA UNIVERSITY OF PETROLEUM (EAST CHINA). Invention is credited to Yuanfang CHENG, Zhongying HAN, Xiaorong LI, Yang LI, Xu REN, Benjian SONG, Wanqing TIAN, Jia WEI, Chuanliang YAN.
Application Number | 20210062620 16/646471 |
Document ID | / |
Family ID | 1000005221139 |
Filed Date | 2021-03-04 |
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United States Patent
Application |
20210062620 |
Kind Code |
A1 |
YAN; Chuanliang ; et
al. |
March 4, 2021 |
DEVICE AND WORKING METHOD FOR DRILLING HYDRATE MICRO-BOREHOLE AND
PERFORMING FAST COMPLETION
Abstract
Disclosed are a device and a method of drilling a hydrate
micro-borehole and performing fast completion, which belongs to the
technical field of a hydrate extraction device and a hydrate
extraction method. The method includes a continuous operation
machine, a power control mechanism, a high pressure water jet pump,
a guider, a continuous pipe, a parent pipe and a child pipe, the
parent pipe is connected with the continuous operation machine, and
an end of the child pipe is connected with a water jet nozzle; the
working method basically includes the following: firstly, a large
main borehole is formed by drilling to a destination layer at one
time with a large size drill bit; secondly, a horizontal
micro-borehole is drilled in a natural gas hydrate reservoir by a
high pressure water jet device formed by the child and parent pipes
and then the child pipe is heated to enable its skin to fall off
and leave a screen; finally, the child and parent pipes are
disconnected to perform well completion. The present disclosure is
applicable to different natural gas hydrate extraction manners. In
this way, well drilling and completion is integrated, sand
production is effectively inhibited, and the production of the
hydrate reservoir is increased with a small effect on the hydrate
reservoir. Thus, drilling is accelerated.
Inventors: |
YAN; Chuanliang; (Qingdao,
CN) ; LI; Xiaorong; (Qingdao, CN) ; REN;
Xu; (Qingdao, CN) ; CHENG; Yuanfang; (Qingdao,
CN) ; HAN; Zhongying; (Qingdao, CN) ; LI;
Yang; (Qingdao, CN) ; WEI; Jia; (Qingdao,
CN) ; SONG; Benjian; (Qingdao, CN) ; TIAN;
Wanqing; (Qingdao, CN) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
CHINA UNIVERSITY OF PETROLEUM (EAST CHINA) |
Qingdao |
|
CN |
|
|
Family ID: |
1000005221139 |
Appl. No.: |
16/646471 |
Filed: |
July 30, 2019 |
PCT Filed: |
July 30, 2019 |
PCT NO: |
PCT/CN2019/098328 |
371 Date: |
March 11, 2020 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
E21B 43/305 20130101;
E21B 41/0099 20200501; E21B 43/088 20130101; E21B 7/18
20130101 |
International
Class: |
E21B 41/00 20060101
E21B041/00; E21B 7/18 20060101 E21B007/18; E21B 43/08 20060101
E21B043/08; E21B 43/30 20060101 E21B043/30 |
Foreign Application Data
Date |
Code |
Application Number |
Apr 8, 2019 |
CN |
201910274015.X |
Claims
1. A device for drilling a hydrate micro-borehole and performing
fast completion, comprising a continuous operation machine, a power
control mechanism, a high pressure water jet pump, a guider and a
parent pipe, wherein the continuous operation machine, the power
control mechanism, the high pressure water jet pump are all located
on a marine drilling platform and sequentially connected; one end
of the parent pipe is connected with the continuous operation
machine, a cable is wrapped on an inner pipe wall of the parent
pipe, the other end of the parent pipe is connected with a parent
pipe joint, a radial section of the parent pipe joint is provided
with a plurality of power control contact points 1, the parent pipe
joint is provided with an electro-magnetic iron, the radial section
of the parent pipe joint is provided with a groove 1 provided with
a sealing rubber ring; a child pipe connected with the parent pipe
joint is further comprised, one end of the child pipe is connected
with the parent pipe joint through a child pipe joint, the other
end is connected with a water jet nozzle, the child pipe runs
through the middle of the guider; a screen skeleton is provided in
the child pipe, the screen skeleton is wrapped by carbon fiber and
epoxy resin, an electro-thermal mechanism is provided in a cavity
of the child pipe joint, the electro-thermal mechanism is connected
with the screen skeleton and the child pipe and the parent pipe are
connected together through the parent pipe joint and the child pipe
joint; and the cable is used to control the electromagnetic iron
and control the electro-thermal mechanism through the power control
contact points.
2. The device according to claim 1, wherein the screen skeleton is
made up of fine steel wires, a body material of the parent pipe
joint is copper and four power control contact points 1 are
provided at a radial section of the parent pipe joint.
3. The device according to claim 2, wherein a body material of the
child pipe joint is magnetic iron, and a radial section of the
child pipe joint is opened with a groove 2, the radial section is
provided with four power control contact points 2 and a side
connecting with the child pipe forms an arc.
4. The device according to claim 3, wherein magnetic shields are
wrapped at outer sides of the connection positions of the child
pipe joint and the parent pipe joint, the magnetic shield on the
child pipe joint is completely wrapped and the magnetic shield on
the parent pipe joint is wrapped in a fan shape.
5. The device according to claim 4, wherein a pump pressure
supplied by the high pressure water jet pump is 35-70 MPa.
6. A working method of drilling a hydrate micro-borehole and
performing fast completion, wherein the working method adopts the
device for drilling a hydrate micro-borehole and performing fast
completion according to claim 1 and comprises the following steps:
at step a, forming a large main borehole by drilling to a hydrate
reservoir with a drill bit, reserving a lateral micro-borehole,
performing casing running operation for the large main borehole and
then injecting cement to perform hole reinforcement; at step b,
placing a sealing rubber ring at a parent pipe joint, switching on
a power source of an electro-magnetic iron through a power control
mechanism to perform connection attraction with a child pipe joint,
and wrapping magnetic shields at outer sides of joints so as to
complete connection of the child pipe and the parent pipe; at step
c, running the connected child pipe and parent pipe into a borehole
by a continuous operation machine; at step d, guiding the child
pipe to the hydrate reservoir through a guider, starting a high
pressure water jet pump to spray a high pressure water jet to drill
a horizontal micro-borehole to a destination displacement so that
the child pipe is attracted to a casing of the reserved horizontal
micro-borehole; at step e, starting an electro-thermal mechanism in
the child pipe joint by the power control mechanism to heat a
screen skeleton of the child pipe, and heating and igniting epoxy
resin in the child pipe by introducing air until the epoxy resin is
burned out so that carbon fiber is attached to the screen skeleton;
at step f, powering off the parent pipe joint to separate from the
child pipe joint so as to complete one horizontal micro-borehole;
and At step g, repeating steps b-f to complete other horizontal
micro-boreholes.
Description
TECHNICAL FIELD
[0001] The present disclosure relates to the technical field of a
hydrate extraction device and a hydrate extraction method and in
particular to a device and a working method for drilling a hydrate
micro-borehole and performing fast completion.
BACKGROUND
[0002] Natural gas hydrate which is also called combustible ice is
a non-stoichiometric cage compound formed by natural gas and water
molecule under the condition of low temperature and high pressure.
In an ideal state, each standard cubic meter of the hydrate may
contain gas molecules equivalent to 180 times its own dissolved
water in volume. China is the largest energy consumer in the world,
which takes 23% of the global energy consumption. Today, along with
increasing depletion of petroleum resources, it is urgent to find a
new energy with advantages such as large resources volume, high
energy density and low pollution to replace the traditional energy.
As a result, natural gas hydrate becomes hotspot of different
countries due to its large reserve, cleanness and high efficiency
and widely recognized as an important subsequent clean energy with
good prospect. Realizing development and utilization of natural gas
hydrate resources is greatly significant for pushing energy
industry development, improving energy consumption structure,
guaranteeing safe energy supply, promoting ecological civilization
construction and maintaining sustained economic and social
development.
[0003] At present, the extraction method of the hydrate includes a
depressurization method, a thermal excitation method and a chemical
reagent injection method. In a natural gas hydrate extraction
device and method disclosed in the patent numbered CN106837258A,
the device mainly includes an extracting ship, a compressor, a gas
engine, a vortex pipe and a gas-liquid separator and the extraction
method mainly includes drilling through a hydrate overburden layer
and a reservoir to form two gas injection wells which form a
communication well, performing well completion for a horizontal
section by a screen pipe, transporting natural gas to the vortex
pipe after pressurizing the natural gas with the compressor on the
extraction ship, injecting hot fluid of a hot end pipe outlet of
the vortex pipe to the gas injection well by a gas injection pipe
and allowing a hot current to enter the hydrate in the hydrate
reservoir through the screen pipe so that the hydrate is decomposed
into natural gas by heat and extracted out of a production well. A
patent numbered CN109252833A discloses a natural gas hydrate
extraction method. In this method, a water injection well and an
extraction well are placed in sea, a hydrate reservoir is heated by
the water injection well, the water injection well and the
extraction well is communicated at a water surface through a first
water pipe so that water discharged by the extraction well enters
the water injection well, the extraction well and the water
injection well are communicated by the first water pipe so that hot
water separated from the extraction well is re-injected into the
water injection well, thereby allowing part of hot water to form
heat circulation, that is, low temperature water initially injected
into the water injection well is heated and injected into the
hydrate reservoir, the hydrate reservoir is heated so that a
mixture extracted by the extraction well is of high temperature,
and water separated from the mixture is re-injected into the
hydrate reservoir.
[0004] However, these extraction methods may damage a stable
structure of the hydrate when the hydrate reservoir is opened,
resulting in decomposition of the hydrate. Further, during an
extraction process, problems such as collapse of the overlying rock
layer and sand production arising from loose hydrate reservoir and
poor particle cementing strength may occur. Furthermore, frequent
drill bit trips will lead to time and labor-consuming completion,
affecting work progress and production. These problems have to be
faced frequently during the extraction process of the hydrate.
SUMMARY
[0005] To overcome the defects of the above prior art, the present
disclosure provides a device and a working method for drilling a
hydrate micro-borehole and performing fast completion. With the
device and the method, the frequent drill bit trips at the time of
drilling a horizontal micro-borehole are reduced. Further, after
the micro-borehole is drilled with a high pressure water jet, a
high pressure hose wall is burned to leave a sand-proof screen pipe
to perform well completion, thereby ensuring integration of well
drilling and completion. Thus, time and labor are saved,
interference of reservoir is small and sand can be prevented and
production is increased.
[0006] One object of the present disclosure is to provide a device
for drilling a hydrate micro-borehole and performing fast
completion, which adopts the following technical solution.
[0007] A device for drilling a hydrate micro-borehole and
performing fast completion includes a continuous operation machine,
a power control mechanism, a high pressure water jet pump, a guider
and a parent pipe. The continuous operation machine, the power
control mechanism and the high pressure water jet pump are all
located on a marine drilling platform and sequentially connected,
one end of the parent pipe is connected with the continuous
operation machine, a cable is wrapped on an inner pipe wall of the
parent pipe, the other end of the parent pipe is connected with a
parent pipe joint which is provided with a plurality of power
control contact points 1 on a radial section, the parent pipe joint
is installed with an electromagnetic iron, the radial section of
the parent pipe joint is provided with a groove 1 and a sealing
rubber ring is provided at the groove 1.
[0008] Further, a child pipe connected with the parent pipe joint
is included. One end of the child pipe is connected with the parent
pipe joint through a child pipe joint, the other end of the child
pipe is connected with a water jet nozzle, and the child pipe runs
through the middle of the guider; the child pipe is provided with a
screen skeleton wrapped by carbon fiber and epoxy resin, an
electro-thermal mechanism is provided in a cavity of the child pipe
joint, the electro-thermal mechanism is connected with the screen
skeleton and the child pipe and the parent pipe are connected
together through the parent pipe joint and the child pipe
joint.
[0009] The cable is used to control the electro-magnetic iron and
control the electro-thermal mechanism through the power control
contact point 1.
[0010] According to a preferred example of the present disclosure,
the screen skeleton is made up of fine steel wires, the body
material of the parent pipe joint is copper and four power control
contact points 1 are disposed at the radial section of the parent
pipe joint.
[0011] According to another preferred example of the present
disclosure, the body material of the child pipe joint is magnetic
iron, a groove 2 is opened at a radial section, and four power
control contact points 2 are disposed at the radial section and a
side connecting with the child pipe forms an arc.
[0012] Further, a magnetic shield is wrapped at an outer side of a
connecting position of the child pipe joint and the parent pipe
joint, the magnetic shield on the child pipe joint is completely
wrapped and the magnetic shield on the parent pipe joint is wrapped
in a fan shape.
[0013] Further, a pump pressure supplied by the high pressure water
jet pump is 35-70 MPa.
[0014] Another object of the present disclosure is to provide a
working method of drilling a hydrate micro-borehole and performing
fast completion, which includes the following steps.
[0015] At step a, a large main borehole is formed by drilling to a
hydrate reservoir with a drill bit, a lateral micro-borehole is
reserved, casing running operation is performed for the large main
borehole and then cement is injected to perform hole
reinforcement.
[0016] At step b, a sealing rubber ring is placed on a parent pipe
joint, a power source of an electro-magnetic iron is switched on by
the power control mechanism to perform connection attraction with
the child pipe joint, and magnetic shields are wrapped at the outer
sides of the joints. At this time, the connection of the child pipe
and the parent pipe is completed.
[0017] At step c, the child pipe and the parent pipe that are well
connected are run into the borehole with the continuous operation
machine.
[0018] At step d, the child pipe is guided to the hydrate reservoir
through a guider, a high pressure water jet pump is started to
spray a high pressure water jet to drill a horizontal
micro-borehole and the drilling is performed to a destination
displacement so that the child pipe joint is attracted to a casing
of the reserved horizontal micro-borehole.
[0019] At step e, an electro-thermal mechanism in the child pipe
joint is started with the power control mechanism to heat a screen
skeleton of the child pipe, and epoxy resin in the child pipe is
heated and ignited by introducing air until the epoxy resin is
burned out. Thus, carbon fiber is attached to the screen
skeleton.
[0020] At step f, the parent pipe joint is powered off to separate
from the child pipe joint so that one horizontal micro-borehole is
completed.
[0021] At step g, steps b-f are repeated to complete other
horizontal micro-boreholes.
[0022] Compared with the prior art, the present disclosure brings
the following beneficial technical effects.
[0023] (1) Compared with other natural gas hydrate extraction
manners, the present disclosure adopts a manner of separation of
the child pipe joint and the parent pipe joint, which is described
as follows: a plurality of child pipe joints are placed into a
wellbore through one parent pipe joint, and the child pipe and the
parent pipe are directly separated after well completion so that
the frequent drill bit trips at the time of drilling a horizontal
micro-borehole are reduced; the hydrate reservoir is mainly
composed of silty fine sand sediment, and the drilling is performed
with high pressure water jet. Compared with the mechanical
structure of the drill bit, the nozzle is simple and does not
require replacement of drill bit, thereby avoiding the problem of
drill bit sticking of the natural gas hydrate horizontal well. As a
result, the working procedure is simple, and operation is
conveniently performed with less time and labor.
[0024] (2) In the present disclosure, the large main borehole is
firstly drilled and the horizontal micro-borehole is then drilled.
With the structure of the large main borehole in cooperation with
the multilateral horizontal micro-borehole, the well screen
structure is optimized, the extraction contact area is increased,
and the production of the hydrate is improved and the drilling of
the horizontal micro-borehole in combination with water jet reduces
the interference and damage to the hydrate reservoir.
[0025] (3) In the present disclosure, after the horizontal
micro-borehole is drilled, the screen skeleton is directly heated
to perform well completion without running a casing. Thus, the well
drilling and completion is integrated so that the period of well
drilling and completion is reduced and the labor and materials are
saved. After the epoxy resin is burned, the carbon fiber is
attached to a screen surface to reinforce the sand prevention
effect of the screen. Thus, the production can be guaranteed while
effective sand prevention is achieved.
BRIEF DESCRIPTION OF THE DRAWINGS
[0026] The present disclosure will be further described below in
combination with the accompanying drawings.
[0027] FIG. 1 is a schematic diagram illustrating an entire
structure of a device for drilling a hydrate micro-borehole and
performing fast completion according to an example of the present
disclosure.
[0028] FIG. 2 is a schematic diagram illustrating a radial section
of a child pipe joint according to an example of the present
disclosure.
[0029] FIG. 3 is a schematic diagram illustrating a radial section
of a parent pipe joint according to an example of the present
disclosure.
[0030] FIG. 4 is a schematic diagram illustrating axial sections of
child and parent pipe joints and child and parent pipes according
to an example of the present disclosure.
[0031] FIG. 5 is a schematic diagram illustrating a magnetic shield
at outer sides of a child pipe joint and a parent pipe joint
according to an example of the present disclosure.
[0032] Numerals of drawings are described as follows: 1--seawater,
2--reservoir overburden rock layer 3--hydrate reservoir,
4--reservoir under-burden rock layer, 5--marine drilling platform,
6--continuous pipe, 6-1--cable, 7--continuous operation machine,
8--power control mechanism, 9--high pressure water jet pump,
10--parent pipe joint, 10-1--power control contact point 1,
10-2--sealing rubber ring, 11--child pipe joint, 11-1--power
control contact point 2, 11-2--groove 2, 11-3--electro-thermal
mechanism, 12--guider, 13--high pressure hose, 13-1--epoxy resin
and carbon fiber, 13-2--screen skeleton, 14--water jet nozzle,
15--magnetic shield, 16--large main borehole, and 17--cement.
DETAILED DESCRIPTION OF THE EMBODIMENTS
[0033] The present disclosure provides a device and a working
method of drilling a hydrate micro-borehole and performing fast
completion. In order to describe the advantages and technical
solutions of the present disclosure more clearly, the present
disclosure will be detailed below in combination with the specific
examples.
[0034] The micro-borehole according to the present disclosure
refers to a horizontal well with a borehole diameter less than 88.9
mm and a borehole curvature radius being about 0.3 m.
[0035] With the device of the present disclosure, the well
completion can be fast performed. "Fast" herein refers to that
child and parent pipes are used to achieve integration of well
drilling and completion and save drill bit trips and well
completion time in the drilling process of the horizontal
micro-borehole compared with a traditional drilling manner.
[0036] FIG. 1 shows a device for drilling a hydrate micro-borehole
and performing fast completion according to an example of the
present disclosure. The device mainly includes a continuous
operation machine 7, a power control mechanism 8, a high pressure
water jet pump 9, a guider 12, and a continuous pipe (parent pipe)
6. The continuous operation machine 7, the power control mechanism
8 and the high pressure water jet pump 9 are all located on a
marine drilling platform 5 and sequentially connected. As one of
major improvements of the present disclosure, a parent pipe and a
child pipe are removably connected with a specific structure shown
in FIGS. 2-5. One end of the parent pipe is connected with the
continuous operation machine 7 which may run the parent pipe into
the borehole, the other end of the parent pipe is connected with a
parent pipe joint 10 which is provided with a plurality of power
control contact points 1 10-1 on a radial section, four power
control contact points 1 are preferably provided according to an
example of the present disclosure, the parent pipe joint is
provided with an electromagnetic iron to facilitate connection with
the child pipe joint, the body material of the parent pipe joint is
copper, the radial section of the parent pipe joint is provided
with a groove 1 which is provided with a sealing rubber ring 10-2,
the parent pipe joint 10 has the body material of copper and is
provided with the electromagnetic iron and the radial section is
opened with a groove for placing the sealing rubber ring 10-2, the
radial section is provided with four power control contact points
10-1, a cable 6-1 is wrapped on an inner pipe wall of the parent
pipe to control the electromagnetic iron of the parent pipe joint
10 and control an electro-thermal mechanism 11-3 of the child pipe
joint through the contact points; one end of the child pipe is
connected with the child pipe joint 11 and the other end is
connected with a water jet nozzle 14 and the child pipe runs
through the middle of the guider; a screen skeleton 13-2 is
provided in the child pipe, the screen skeleton is made up of fine
steel wires and wrapped by carbon fiber and epoxy resin 13-1, the
electro-thermal mechanism 11-3 is provided in a cavity of the child
pipe joint, the electro-thermal mechanism is connected with the
screen skeleton 13-2, the diameter of the high pressure hose (the
child pipe) 13 is .PHI.50 mm, and the child pipe and the parent
pipe are connected together through the parent pipe joint and the
child pipe joint.
[0037] Preferably, a body material of the child pipe joint is
magnetic iron and a radial section of the child pipe joint is
opened with a groove 2 11-2, four power control contact points 2
11-1 are provided at the radial section and a side connecting with
the child pipe forms an arc. In this way, close attraction to a
casing wall of the large main borehole 16 is facilitated upon well
completion.
[0038] Further, magnetic shields 15 are wrapped at outer sides of
the connection positions of the child pipe joint and the parent
pipe joint, the magnetic shield on the child pipe joint is
completely wrapped and the magnetic shield on the parent pipe joint
is wrapped in a fan shape to facilitate subsequent separation.
[0039] Further, the pump pressure supplied by the above high
pressure water jet pump is 35-70 MPa.
[0040] A working method of drilling a hydrate micro-borehole and
performing fast completion is provided. The method adopts the
device for drilling a hydrate micro-borehole and performing fast
completion according to the present disclosure and includes the
following steps.
[0041] At step 1, a large main borehole 16 is formed by drilling to
a hydrate reservoir 3 with a drill bit, a lateral micro-borehole is
reserved, casing running operation is performed for the large main
borehole 16 and then cement 17 is injected to perform hole
reinforcement.
[0042] At step 2, a sealing rubber ring 10-2 is placed on a parent
pipe joint 10, a power source of an electro-magnetic iron is
switched on by the power control mechanism 8 on the platform to
perform connection attraction with the child pipe joint 11, and
magnetic shields 15 are wrapped at the outer sides of the
joints.
[0043] At step 3, a child pipe and a parent pipe that are well
connected are run into the borehole with the continuous operation
machine 7.
[0044] At step 4, the high pressure hose is guided to a destination
layer through a guider 12, a high pressure water jet pump 9 is
started to spray a high pressure water jet to drill a horizontal
micro-borehole and the drilling is performed to a destination
displacement so that the child pipe joint 11 is attracted to a
casing of the reserved horizontal micro-borehole.
[0045] At step 5, a electro-thermal mechanism 11-3 in the child
pipe joint 11 is started with the power control mechanism 8 on the
platform to heat a screen skeleton 13-2 of the child pipe, and
epoxy resin of the high pressure hose 13 is ignited by introducing
air until the epoxy resin is burned out. Thus, carbon fiber is
attached to the screen skeleton.
[0046] At step 6, the parent pipe joint 10 is powered off to
separate from the child pipe joint 11 so that one horizontal
micro-borehole is completed.
[0047] At step 7, steps 2-6 are repeated to complete other
horizontal micro-boreholes.
[0048] In the above first step, a reservoir overburden rock layer 2
and seawater 1 are sequentially above the hydrate reservoir 3 and a
reservoir under-burden rock layer 4 is below the hydrate reservoir
3.
[0049] Compared with other natural gas hydrate extraction manners,
the present disclosure adopts a manner of separation of the child
pipe joint and the parent pipe joint, which reduces frequent drill
bit trips at the time of drilling a horizontal micro-borehole; the
hydrate reservoir 3 is mainly composed of silty fine sand sediment,
and the drilling is performed with high pressure water jet.
Compared with the mechanical structure of the drill bit, the water
jet nozzle 14 is simple and does not require replacement of drill
bit, thereby avoiding the problem of drill bit sticking of the
natural gas hydrate horizontal well. As a result, the working
procedure is simple, and operation is conveniently performed with
less time and labor.
[0050] A part not mentioned in the present disclosure may be
realized by virtue of the prior art.
[0051] It is noted that any equivalent substitutions or obvious
modifications made by those skilled in the art under the teaching
of the present disclosure shall fall within the scope of protection
of the present disclosure.
* * * * *