U.S. patent application number 16/708432 was filed with the patent office on 2020-06-11 for deep rock quality assurance coring device and coring method thereof.
The applicant listed for this patent is SHENZHEN UNIVERSITY SICHUAN UNIVERSITY. Invention is credited to Ling Chen, Mingzhong Gao, Zhiqiang He, Tao Liu, Yifan Wu, Heping Xie, Ru Zhang.
Application Number | 20200182000 16/708432 |
Document ID | / |
Family ID | 70970803 |
Filed Date | 2020-06-11 |
United States Patent
Application |
20200182000 |
Kind Code |
A1 |
Xie; Heping ; et
al. |
June 11, 2020 |
DEEP ROCK QUALITY ASSURANCE CORING DEVICE AND CORING METHOD
THEREOF
Abstract
The present disclosure relates to the field of scientific
drilling technology and provides a deep rock quality assurance
coring device and coring method thereof. The deep rock quality
assurance coring device comprises a drilling tool, a drilling bit,
a central rod and a core storage body, wherein the drilling bit is
mounted at the lower end of the drilling tool, the lower end of the
central rod is connected to the core storage body, and the central
rod is capable of driving the core storage body to move in the
drilling tool in an axial direction of the drilling tool, a
reservoir chamber having a lower end opening is arranged in the
central rod, a core storage chamber having a lower end opening is
arranged in the core storage body.
Inventors: |
Xie; Heping; (Shenzhen,
CN) ; Liu; Tao; (Shenzhen, CN) ; Chen;
Ling; (Shenzhen, CN) ; Gao; Mingzhong;
(Shenzhen, CN) ; Zhang; Ru; (Shenzhen, CN)
; Wu; Yifan; (Shenzhen, CN) ; He; Zhiqiang;
(Shenzhen, CN) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
SHENZHEN UNIVERSITY
SICHUAN UNIVERSITY |
Shenzhen
Chengdu |
|
CN
CN |
|
|
Family ID: |
70970803 |
Appl. No.: |
16/708432 |
Filed: |
December 9, 2019 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
PCT/CN2018/119535 |
Dec 6, 2018 |
|
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16708432 |
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Current U.S.
Class: |
1/1 |
Current CPC
Class: |
E21B 25/10 20130101;
E21B 25/08 20130101; E21B 10/02 20130101 |
International
Class: |
E21B 25/10 20060101
E21B025/10; E21B 10/02 20060101 E21B010/02 |
Claims
1. A deep rock quality assurance coring device comprising a
drilling tool, a drilling bit, a central rod and a core storage
body for storing a rock core, wherein the drilling bit is mounted
at the lower end of the drilling tool, the lower end of the central
rod is connected to the core storage body, and the central rod is
capable of driving the core storage body to move in the drilling
tool in an axial direction of the drilling tool, a reservoir
chamber having a lower end opening is arranged in the central rod,
a core storage chamber having a lower end opening is arranged in
the core storage body, a first valve controlling communication or
blocking of the reservoir chamber and the core storage chamber is
mounted on the upper end of the core storage body, a second valve
closing or opening the lower end opening of the core storage
chamber is mounted on the inner wall of the drilling tool; before
the deep rock quality assurance coring device extracts the rock
core, a first liquid is stored in the reservoir chamber, and the
lower end opening of the reservoir chamber is closed by closing the
first valve, so as to block the reservoir chamber and the core
storage chamber, a second liquid is stored in the core storage
chamber and the lower end opening of the core storage chamber is
closed by a membrane.
2. The deep rock quality assurance coring device of claim 1,
wherein the inner wall of the core storage body is provided with a
liquid flow path, and when the first valve is opened, the reservoir
chamber communicates with the core storage chamber through the
liquid flow path.
3. The deep rock quality assurance coring device of claim 2,
wherein the liquid flow path comprises a plurality of branching
paths and a plurality of openings communicating with each other,
and when the first valve is opened, the reservoir chamber, the
branching path, the opening and the core storage chamber are
sequentially connected.
4. The deep rock quality assurance coring device of claim 3,
wherein the plurality of branching paths extend in an axial
direction of the core storage body.
5. The deep rock quality assurance coring device of claim 4,
wherein the plurality of branching paths are evenly distributed
along a circumferential direction of the core storage body.
6. The deep rock quality assurance coring device of claim 5,
wherein the plurality of openings are arranged at equal intervals
along the axial direction of the core storage body.
7. The deep rock quality assurance coring device of claim 1,
wherein the first valve is an electronically controlled valve and
the second valve is a flap valve.
8. The deep rock quality assurance coring device of claim 1,
wherein the inner wall of the lower end of the drilling tool is
provided with a claw for clamping the rock core.
9. The deep rock quality assurance coring device of claim 1,
wherein the first liquid is water, and the second liquid is a
solution formed by mixing hydroxyl terminated polydimethylsiloxane,
crosslinking agent, catalyst and fillers.
10. A coring method of the deep rock quality assurance coring
device of claim 1, comprising the following steps: firstly, after
the first liquid is stored in the reservoir chamber, the first
valve is closed so as to block the reservoir chamber and the core
storage chamber, and then the second liquid is stored in the core
storage chamber and the lower end opening of the core storage
chamber is closed by the membrane to prevent the second liquid from
flowing out; the drilling tool is started, and the drilling tool
drives the drilling bit to perform rock breaking work; in the
process of rock core extraction, the rock core breaks through the
membrane and starts to enter into the core storage chamber, at this
time, the second liquid in the core storage chamber starts to be
discharged due to the entry of the rock core; in the process of the
rock core entering the core storage chamber, the second liquid
always wraps the rock core to avoid contamination of the rock core
caused by other liquids; and after the rock core enters the core
storage chamber, the coring process is finished, the drilling tool
stops working, the second valve is closed, so that the second valve
covers the lower end opening of the core storage chamber, and then
the first valve is opened to make the reservoir chamber and the
core storage chamber communicate with each other, so that the first
liquid in the reservoir chamber enters the core storage chamber and
contacts with the second liquid around the rock core to trigger
in-situ curing and form a sealing film to wrap the rock core, and
isolate the rock core from the outside.
Description
CROSS-REFERENCE TO RELATED APPLICATION
[0001] This application is a continuation-in-part application of
International Application No. PCT/CN2018/119535, filed on Dec. 6,
2018, the entire content of which is incorporated herein by
reference.
TECHNICAL FIELD
[0002] The present disclosure relates to the field of scientific
drilling technology, and in particular to a deep rock quality
assurance coring device and coring method thereof.
BACKGROUND
[0003] At present, the quality assurance technology of deep rock
drilling core is basically in a qualitative and relative quality
assurance state, and cannot achieve completely quality assurance of
the rock core. In the process of core drilling and core extraction,
the rock core will be polluted by formation water or drilling fluid
at the bottom of the well, which will affect the in-situ quality,
oil and gas content and humidity of the rock core, and the
microbial living environment will be changed due to the influence
of air after core extraction, which will affect scientific
research. At the same time, the loss of oil and gas resources
inside the rock core will lead to the distortion of resource
evaluation. Therefore, the basic premise of deep rock scientific
exploration is to achieve in-situ quality assurance coring.
[0004] A large amount of scientific drilling researches have been
carried out in China, but the rock coring technology cannot achieve
complete quality assurance of the rock core, which is very
unfavorable for in-situ environment exploration, oil and gas
resources exploration, and deep geological medicine research. It is
urgent to provide rock in-situ quality assurance coring technology
to lay the foundation for deep rock scientific exploration and
research.
SUMMARY
[0005] A technical problem to be solved by embodiments of the
present disclosure is to provide a deep rock quality assurance
coring device and coring method thereof in order to solve a problem
that the deep rock coring technology in the prior art cannot
achieve completely quality assurance coring and lead to the in-situ
quality of the rock core to be affected.
[0006] Embodiments of the present disclosure are achieved by
providing a deep rock quality assurance coring device, the device
comprises a drilling tool, a drilling bit, a central rod and a core
storage body for storing a rock core, wherein the drilling bit is
mounted at the lower end of the drilling tool, the lower end of the
central rod is connected to the core storage body, and the central
rod is capable of driving the core storage body to move in the
drilling tool in an axial direction of the drilling tool, a
reservoir chamber having a lower end opening is arranged in the
central rod, a core storage chamber having a lower end opening is
arranged in the core storage body, the first valve controlling
communication or blocking of the reservoir chamber and the core
storage chamber is mounted on the upper end of the core storage
body, the second valve closing or opening the lower end opening of
the core storage chamber is mounted on the inner wall of the
drilling tool;
[0007] Before the deep rock quality assurance coring device
extracts the rock core, the first liquid is stored in the reservoir
chamber, and the lower end opening of the reservoir chamber is
closed by closing the first valve, so as to block the reservoir
chamber and the core storage chamber, the second liquid is stored
in the core storage chamber and the lower end opening of the core
storage chamber is closed by a membrane.
[0008] Furthermore, the inner wall of the core storage body is
provided with a liquid flow path, and when the first valve is
opened, the reservoir chamber communicates with the core storage
chamber through the liquid flow path.
[0009] Furthermore, the liquid flow path comprises a plurality of
branching paths and a plurality of openings communicating with each
other, and when the first valve is opened, the reservoir chamber,
the branching path, the opening and the core storage chamber are
sequentially connected.
[0010] Furthermore, the plurality of branching paths extend in an
axial direction of the core storage body.
[0011] Furthermore, the plurality of branching paths are evenly
distributed along a circumferential direction of the core storage
body.
[0012] Furthermore, the plurality of openings are arranged at equal
intervals along the axial direction of the core storage body.
[0013] Furthermore, the first valve is an electronically controlled
valve and the second valve is a flap valve.
[0014] Furthermore, the inner wall of the lower end of the drilling
tool is provided with a claw for clamping the rock core.
[0015] Furthermore, the first liquid is water, and the second
liquid is a solution formed by mixing hydroxyl terminated
polydimethylsiloxane, crosslinking agent, catalyst and fillers.
[0016] The embodiment of the present disclosure further provides a
coring method of the above deep rock quality assurance coring
device, wherein the coring method comprises the following
steps:
[0017] Firstly, after the first liquid is stored in the reservoir
chamber, the first valve is closed so as to block the reservoir
chamber and the core storage chamber, and then the second liquid is
stored in the core storage chamber and the lower end opening of the
core storage chamber is closed by the membrane to prevent the
second liquid from flowing out;
[0018] The drilling tool is started, and the drilling tool drives
the drilling bit to perform rock breaking work; in the process of
rock core extraction, the rock core breaks through the membrane and
starts to enter into the core storage chamber, at this time, the
second liquid in the core storage chamber starts to be discharged
due to the entry of the rock core; in the process of the rock core
entering the core storage chamber, the second liquid always wraps
the rock core to avoid contamination of the rock core caused by
other liquids; and
[0019] After the rock core enters the core storage chamber, the
coring process is finished, the drilling tool stops working, the
second valve is closed, so that the second valve covers the lower
end opening of the core storage chamber, and then the first valve
is opened to make the reservoir chamber and the core storage
chamber communicate with each other, so that the first liquid in
the reservoir chamber enters the core storage chamber and contacts
with the second liquid around the rock core to trigger in-situ
curing and form a sealing film to wrap the rock core, and isolate
the rock core from the outside, thereby avoiding changes of the
living environment of the microorganisms on the rock core, and at
the same time preventing the loss of oil and gas resources inside
the rock core from leading to the distortion of the resource
evaluation, and finally completely achieving the purpose of quality
assurance coring.
[0020] In the coring process of the deep rock quality assurance
coring device of the present disclosure, when the rock core breaks
through the membrane and enters the core storage chamber, the rock
core is always wrapped by the second liquid, so as to avoid the
contamination of the rock core caused by other liquids in the depth
of the formation, and after the rock core enters the core storage
chamber, the first liquid in the reservoir chamber enters the core
storage chamber and contacts with the second liquid around the rock
core to trigger in-situ curing and form a sealing film to wrap the
rock core, and isolate the rock core from the outside, thereby
avoiding changes of the living environment of the microorganisms on
the rock core, and at the same time preventing the loss of oil and
gas resources inside the rock core from leading to the distortion
of the resource evaluation, and finally achieving the purpose of
quality assurance coring and ensuring the in-situ quality state of
the rock core, which lays the foundation for deep rock science
exploration and research.
BRIEF DESCRIPTION OF THE DRAWINGS
[0021] In order to more clearly illustrate the technical solutions
in the embodiments of the present disclosure, drawings used in the
description of the embodiments will be briefly described below.
Obviously, the drawings in the following description are some
embodiments of the present disclosure. Those skilled in the art can
also obtain other drawings based on these drawings without any
creative efforts.
[0022] FIG. 1 is a schematic structural diagram of the deep rock
quality assurance coring device provided in the embodiments of the
present disclosure before coring.
[0023] FIG. 2 is a schematic diagram of enlarged structure of area
A shown in FIG. 1.
[0024] FIG. 3 is a schematic diagram of section structure in the
B-B direction shown in FIG. 1.
[0025] In the drawings, all reference signs are:
[0026] 1--drilling tool, 2--drilling bit, 3--central rod, 4--core
storage body, 5--claw, 6--first valve, 7--second valve,
30--reservoir chamber, 40--core storage chamber , 41--branching
path and 42--opening.
DESCRIPTION OF THE EMBODIMENTS
[0027] To make the objectives, technical solutions and advantages
of the present disclosure clearer, the following further describes
the present disclosure in detail with reference to the accompanying
drawings and embodiments. It should be understood that the
described specific embodiments are merely used to explain the
present disclosure rather than to limit the present disclosure.
[0028] FIG. 1 to FIG. 3 show a deep rock quality assurance coring
device provided in embodiments of the present disclosure. The deep
rock quality assurance coring device comprises a drilling tool 1, a
drilling bit 2, a central rod 3 and a core storage body 4 for
storing a rock core, wherein the drilling bit 2 is mounted at the
lower end of the drilling tool 1, the lower end of the central rod
3 is connected to the core storage body 4, and the central rod 3 is
capable of driving the core storage body 4 to move in the drilling
tool 1 in an axial direction of the drilling tool 1, so as to drive
the drilling bit 2 to perform rock breaking work by starting the
drilling tool 1, and to drive the core storage body 4 to perform a
rock core extracting operation by driving the central rod 3. The
inner wall of the lower end of the drilling tool 1 is provided with
a claw 5 to clamp the rock core and break the rock core, and a
reservoir chamber 30 having a lower end opening is arranged in the
central rod 3, a core storage chamber 40 having a lower end opening
is arranged in the core storage body 4, the reservoir chamber 30
communicates with the upper end of the core storage chamber 40
through its lower end opening. The first valve 6 is mounted on the
upper end of the core storage body 4, and the first valve 6 is an
electronically controlled valve. The reservoir chamber 30 and the
core storage chamber 40 are controlled to communicate with each
other or block each other by opening or closing the first valve 6.
The second valve 7 is mounted on the inner wall of the drilling
tool 1, and the second valve 7 is an electrically controlled flap
valve. The lower end opening of the core storage chamber 40 is
closed or opened by opening or closing the second valve 7.
[0029] Before the deep rock quality assurance coring device
extracts the rock core, a certain amount of the first liquid (not
shown in the figure) is stored in the reservoir chamber 30, and the
lower end opening of the reservoir chamber 30 is closed by closing
the first valve 6, so as to block the reservoir chamber 30 and the
core storage chamber 40 to prevent the first liquid from flowing
into the core storage chamber 40; the second liquid (not shown in
the figure) is stored in the core storage chamber 40 and the lower
end opening of the core storage chamber 40 is closed by a membrane
(not shown in the figure) to prevent the second liquid from flowing
out. After the deep rock quality assurance coring device extracts
the rock core, the rock core enters the core storage chamber 40 to
discharge a portion of the second liquid, and at the same time, the
first valve 6 is opened, so that the first liquid in the reservoir
chamber 30 enters the core storage chamber 40 and contacts with the
second liquid around the rock core to trigger in-situ curing and
form a sealing film to wrap the rock core after the first liquid
and the second liquid are contacted with each other, thereby
isolating the rock core from the outside.
[0030] In the above embodiment, the inner wall of the core storage
body 4 is provided with a liquid flow path, and when the first
valve 6 is opened, the reservoir chamber 30 communicates with the
core storage chamber 40 through the liquid flow path. Specifically,
the liquid flow path comprises a plurality of branching paths 41
and a plurality of openings 42 communicating with each other, and
when the first valve 6 is opened, the reservoir chamber 30, the
branching path 41, the opening 42 and the core storage chamber 40
are sequentially connected; the plurality of branching paths 41
extend in an axial direction of the core storage body 4 and are
evenly distributed along a circumferential direction of the core
storage body 4, and the plurality of openings 42 are arranged at
equal intervals along the axial direction of the core storage body
4, so that the first liquid can flow into the core storage chamber
40 rapidly and uniformly and mix with the second liquid.
[0031] In the embodiment, the first liquid may be water, and the
second liquid is a solution formed by mixing hydroxyl terminated
polydimethylsiloxane, crosslinking agent and catalyst, i.e., the
second liquid may be a solution formed by mixing hydroxyl
terminated polydimethylsiloxane, methyl trimethylketoxime silane,
dibutyl tin dilaurate, graphene and organic montmorillonite, a
solution formed by mixing hydroxyl terminated polydimethylsiloxane,
methyl trimethoxysilane, dibutyl tin dilaurate, graphene and
organic montmorillonite, a solution formed by mixing hydroxyl
terminated polydimethylsiloxane, methyl trimethoxysilane , dibutyl
tin dilaurate , graphene and boron nitride. In other embodiments,
the first liquid and the second liquid may also be other liquids
that are capable of forming a sealed protective layer on the rock
core after contacting or mixing.
[0032] The embodiment of the present disclosure further provides a
coring method of the above deep rock quality assurance coring
device, wherein the coring method comprises the following
steps:
[0033] Firstly, after the first liquid is stored in the reservoir
chamber 30, the first valve 6 is closed so as to block the
reservoir chamber 30 and the core storage chamber 40, and then the
second liquid is stored in the core storage chamber 40 and the
lower end opening of the core storage chamber 40 is closed by the
membrane to prevent the second liquid from flowing out; the second
liquid in the embodiment is a solution formed by mixing hydroxyl
terminated polydimethylsiloxane, crosslinking agent,catalyst and
fillers, which is a viscous liquid, and is capable of closing the
lower end opening of the core storage chamber through a sticky film
such as a cling film;
[0034] After the first liquid and the second liquid are stored, the
drilling tool 1 is started, and the drilling tool 1 drives the
drilling bit 2 to perform rock breaking work; in the process of
rock core extraction, the rock core passes through the claw 5, and
breaks through the membrane and starts to enter into the core
storage chamber 40 of the core storage body 4, at this time, the
second liquid in the core storage chamber 40 starts to be slowly
discharged due to the entry of the rock core; in the process of the
rock core entering the core storage chamber 40, the second liquid
always wraps the rock core to avoid contamination of the rock core
caused by other liquids; and
[0035] After the rock core enters the core storage chamber 40, the
coring process is finished, the drilling tool 1 stops working, and
the central rod 3 drives the core storage body 4 to lift upward, at
the moment the central rod 3 rises, the claw 5 clamps the rock
core, as the rock core is pulled apart, the core storage body moves
upward until it crosses the second valve, the second valve 7 is
closed, so that the second valve 7 covers the lower end opening of
the core storage chamber 40, so as to cover the rock core in the
core storage chamber 40, and then the first valve 6 is opened to
make the reservoir chamber 30 and the core storage chamber 40
communicate with each other, so that the first liquid in the
reservoir chamber 30 enters the core storage chamber 40 through the
liquid flow path, and contacts with the second liquid around the
rock core to trigger in-situ curing and form a sealing film to wrap
the rock core, and the rock core is in a state of quality assurance
throughout the whole coring process.
[0036] In summary, in the coring process of the deep rock quality
assurance coring device of the present disclosure, when the rock
core breaks through the membrane and enters the core storage
chamber 40, the rock core is always wrapped by the second liquid,
so as to avoid the contamination of the rock core caused by other
liquids in the depth of the formation, and after the rock core
enters the core storage chamber 40, the first liquid in the
reservoir chamber 30 enters the core storage chamber 40 and
contacts with the second liquid around the rock core to trigger
in-situ curing and form a sealing film to wrap the rock core, and
isolate the rock core from the outside, thereby avoiding changes of
the living environment of the microorganisms on the rock core, and
at the same time preventing the loss of oil and gas resources
inside the rock core from leading to the distortion of the resource
evaluation, and finally completely achieving the purpose of quality
assurance coring and ensuring the in-situ quality state of the rock
core, which lays the foundation for deep rock science exploration
and research.
[0037] The above merely describes preferred embodiments of the
present disclosure, but is not used to limit the present
disclosure. Any modifications, equivalent replacements,
improvements and the like within the spirit and principle of the
present disclosure shall be all contained in the protection scope
of the present disclosure.
* * * * *