CN112963120A - Device and method for coal bed gas horizontal well completion - Google Patents
Device and method for coal bed gas horizontal well completion Download PDFInfo
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- CN112963120A CN112963120A CN202110112840.7A CN202110112840A CN112963120A CN 112963120 A CN112963120 A CN 112963120A CN 202110112840 A CN202110112840 A CN 202110112840A CN 112963120 A CN112963120 A CN 112963120A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices, or the like
- E21B33/14—Methods or devices for cementing, for plugging holes, crevices, or the like for cementing casings into boreholes
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
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Abstract
The invention provides a device and a method for completing a coal bed gas horizontal well, wherein the device comprises an outer-layer non-metal casing and an inner-layer metal casing. The inner layer metal sleeve is positioned in the outer layer non-metal sleeve, and the outer layer non-metal sleeve and the inner layer metal sleeve are both suspended in the two-way metal sleeve. A control valve is arranged in the inner-layer metal sleeve, and a fluid circulation channel can be established between the outer-layer non-metal sleeve and the inner-layer metal sleeve. The device and the method provided by the invention have the advantages that the double-layer casing is arranged in the horizontal section of the coal bed gas horizontal well, the problems of re-entry, well washing, yield increasing measures and the like of the horizontal section after the completion of the coal bed gas horizontal well are solved, when coal is mined after gas is pre-extracted, the inner-layer metal casing is well fixed without cement outside the metal casing and is wrapped by the outer-layer non-metal casing, the double-layer casing can be directly removed before coal mining, such as roadway tunneling, and the influence on mechanical coal mining is reduced to the minimum.
Description
Technical Field
The invention relates to the technical field of coal bed gas horizontal well completion, in particular to a device for coal bed gas horizontal well completion.
Background
Before coal mining, the high-gas coal mine needs to perform coal mining operation on the premise of effectively reducing the gas concentration of the coal bed according to the principle of 'pumping completely, pumping first and then, and pre-pumping ahead', so that the coal mine is required to perform pre-pumping operation ahead of time, and pre-pumping is performed in a ground drilling mode. Because of the high mechanization of the prior coal mining operation, if a steel sleeve is put under a coal seam or a well cementation cement sheath is left when gas is pre-extracted in advance, negative effects can be caused to the coal mining operation, the prior automatic coal mining machine stops working before the steel sleeve is extracted, the steel sleeve and the well cementation cement are removed by adopting a manual method, then the automatic coal mining can be carried out, a large amount of manpower and material resources are wasted, and the coal mining efficiency is greatly reduced.
In order to avoid the problem during coal mining, a horizontal well type is adopted in many coal mines at present when ground pre-extraction is carried out, nonmetal sleeves such as glass fiber reinforced plastic sleeves or PE (polyethylene) pipes are put in a coal seam, the coal seam is not well-fixed, a horizontal section is blocked by coal dust during long-time pre-extraction, the extraction efficiency is seriously influenced, even no gas is produced, the horizontal well is scrapped, and great investment waste is caused. In order to solve the problem of blockage of a shaft at the horizontal section, various methods are conceived, and the core problem is that the problem of reentry of a glass fiber reinforced plastic sleeve at the horizontal section cannot be solved.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a device and a method for completing a coal bed gas horizontal well.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
an apparatus for completing a coalbed methane horizontal well comprises an outer-layer non-metal casing and an inner-layer metal casing. Wherein, the inner layer metal sleeve is positioned in the outer layer nonmetal sleeve, and the outer layer nonmetal sleeve and the inner layer metal sleeve are both hung in the two-opening metal sleeve. A control valve is arranged in the inner-layer metal sleeve, and a circulating channel can be established between the outer-layer non-metal sleeve and the inner-layer metal sleeve.
According to the device for completing the coal bed gas horizontal well, a three-opening structure is adopted in the process of horizontally drilling a well from the ground to a coal bed, a non-metal casing is arranged in the three-opening horizontal section, a metal casing and accessories are arranged in the non-metal casing, the three-opening double casing is hung in the two-opening metal casing in the deflecting section, the problem that the horizontal section enters the well after the completion of the coal bed gas horizontal well is solved through an insertion mode, the problems of later-stage horizontal section blockage and the like are solved, and a horizontal-section circulation channel is provided for well washing and yield increasing measures. When coal is mined after gas pre-extraction, the inner steel sleeve is cemented without cement and is wrapped by the outer non-metal sleeve, so that the cement can be directly removed before mining, such as roadway tunneling, the influence on mechanical coal mining is minimized, the cost can be saved, the method is particularly suitable for a high-gas coal mine pre-extraction horizontal well, and a drilling and completion scheme is provided for solving the coal mine pre-extraction problem in advance, economically and reliably.
With respect to the above technical solution, further improvements as described below can be made.
According to the device for completing the coalbed methane horizontal well, in a preferred embodiment, the outer-layer non-metal casing is suspended in the double-opening metal casing by using an outer-layer casing hanger.
The outer-layer non-metal casing pipe is hung through the hanger, so that the device is convenient to install and fix, and the stable and reliable structure can be ensured.
Further, in a preferred embodiment, a sealing means is provided between the outer casing hanger and the outer non-metallic casing.
The sealing performance of the whole device can be effectively guaranteed through the sealing device, and the influence on the reliability of well completion operation is avoided.
Specifically, in a preferred embodiment, the inner metal casing is suspended in the double-opening metal casing by using an inner casing hanger, and the inner casing hanger is provided with a circulation channel.
Hang outer non-metallic sleeve pipe through the hanger, the installation and the fixing of the device of being convenient for, and can guarantee stable in structure reliably, and can effectively ensure to establish fluid circulation passageway between inlayer metallic sleeve pipe and the outer non-metallic sleeve pipe through circulation passageway.
Further, in a preferred embodiment, a sealing means is provided between the inner casing hanger and the inner metal casing.
The sealing performance of the whole device can be effectively guaranteed through the sealing device, and the influence on the reliability of well completion operation is avoided.
Specifically, in a preferred embodiment, a check valve is arranged in the inner metal sleeve at a position close to the two ends.
The structure can ensure the stable and reliable processes of well completion operation and well washing operation, and effectively avoid the reflux generated in the fluid circulation process.
The method for completing the coalbed methane horizontal well according to the second aspect of the invention is implemented by adopting the device, and specifically comprises the following steps: s01, completing horizontal well drilling by adopting a three-opening structure: cementing after a metal casing is laid, deflecting until the coal seam roof is nearly horizontal and laying the metal casing, cementing, and horizontally drilling the third opening in the coal seam to a preset length; s02, well completion operation: the third opening is arranged in the device and is hung in the second opening metal sleeve. And S03, well washing operation.
According to the method for completing the coal bed gas horizontal well, the device is adopted for implementation, the problem of reentry of the horizontal section after the completion of the coal bed gas horizontal well is solved in an insertion mode, the problems of blockage of the horizontal section in the later period and the like are solved, and a circulating channel of the horizontal section is provided for well washing and yield increasing measures. When coal is mined after gas pre-extraction, the inner layer steel sleeve is cemented without cement and is wrapped by the outer layer non-metal sleeve, so that the cement-free cementing well is convenient to remove, the influence on mechanical mining is reduced to the minimum, the cost can be saved, the method is particularly suitable for a high-gas coal mine pre-extraction horizontal well, and a drilling and completion scheme is provided for solving the coal mine pre-extraction problem in advance, economically and reliably.
With respect to the above technical solution, further improvements as described below can be made.
Further, in a preferred embodiment, in step S03, the tubing and the insert head are first lowered, the well is lowered to a position close to the insertion opening of the inner casing hanger, the pump is started to flush the insertion opening for a preset time, and then the well is lowered to a preset pressure range to insert the insert head into the insertion opening of the inner casing hanger to start the well-flushing operation.
The insertion opening is washed clean before the well washing operation, so that the sealing performance of the subsequent insertion head and the insertion opening is facilitated, and the smooth operation of the well washing operation is prevented from being influenced.
Further, in a preferred embodiment, in step S03, before the well-flushing operation is started, the pressure is tested within a preset pressure range and a preset time period to verify the plugging tightness, and then the pressure is continuously increased to the preset pressure range to open the control valve in the inner metal casing until the surface wellhead is drained to complete the test cycle.
Through the detection and the trial circulation of the early-stage sealing performance, the smooth operation of the well washing work can be ensured to a great extent.
Further, in a preferred embodiment, in step S03, after the well-flushing operation is completed, the pump is stopped at the surface, the control valve is closed after a preset time period, pressure is tested within a preset pressure range and a preset time period to verify the tightness of the control valve, and then the insertion head is pulled out, and the well-flushing operation is completed after the drill-out operation.
Through the detection of the sealing performance of the subsequent control valve, the smooth operation of the next completion operation and well flushing operation can be ensured.
Compared with the prior art, the invention has the advantages that: the double-layer sleeve is arranged below the horizontal section of the coal bed gas horizontal well, so that the problems of re-entry, well washing, production increasing measures and the like of the horizontal section after completion of the coal bed gas horizontal well are solved, when coal is mined after gas is pre-extracted, the inner-layer metal sleeve is not cemented outside and is wrapped by the outer-layer non-metal sleeve, so that the removal is convenient, and the influence on mechanized coal mining is reduced to the minimum.
Drawings
The invention will be described in more detail hereinafter on the basis of embodiments and with reference to the accompanying drawings. Wherein:
FIG. 1 schematically illustrates the overall construction of an apparatus for completion of a coalbed methane horizontal well in accordance with an embodiment of the present invention;
FIG. 2 schematically illustrates an apparatus for completing a coalbed methane horizontal well according to an embodiment of the present invention in a flushing operation;
FIG. 3 schematically illustrates a top view of an inner casing hanger of an embodiment of the present invention;
FIG. 4 schematically illustrates a flow chart of a method for completing a coalbed methane horizontal well in accordance with an embodiment of the present invention.
Detailed Description
The invention will be further explained in detail with reference to the figures and the embodiments without thereby limiting the scope of protection of the invention.
FIG. 1 schematically illustrates the overall configuration of an apparatus 10 for completing a coalbed methane horizontal well in accordance with an embodiment of the present invention. Fig. 2 schematically shows the apparatus 10 for completing a coalbed methane horizontal well according to an embodiment of the present invention in a well-flushing operation. Fig. 3 schematically shows a top view of an inner casing hanger 4 according to an embodiment of the present invention. FIG. 4 schematically illustrates a flow chart of a method for completing a coalbed methane horizontal well in accordance with an embodiment of the present invention.
Example 1
As shown in fig. 1 and 2, the device 10 for completing a coal bed gas horizontal well according to the embodiment of the present invention comprises an outer non-metallic casing 1 and an inner metallic casing 2. Wherein, the inner layer metal sleeve 2 is positioned in the outer layer nonmetal sleeve 1, and the outer layer nonmetal sleeve 1 and the inner layer metal sleeve 2 are both hung in the two-opening metal sleeve 7. A control valve 3 is arranged in the inner layer metal sleeve 2, and a circulating channel 4 can be established between the outer layer nonmetal sleeve 1 and the inner layer metal sleeve 2.
According to the device for completing the coal bed gas horizontal well, in the process of horizontally drilling a well to a coal bed from the bottom surface, a three-opening structure is adopted, a non-metal casing is arranged in the three-opening horizontal section, a metal casing and accessories are arranged in the non-metal casing, the three-opening double casing is hung in the two-opening metal casing in the deflecting section, the problem that the horizontal section enters the well after the completion of the coal bed gas horizontal well is solved through an inserting mode, the problem that the horizontal section is blocked in the later period is solved, and a circulating channel of the horizontal section is provided for well washing and yield increasing measures. When coal is mined after gas pre-extraction, the inner layer steel sleeve is cemented without cement and is wrapped by the outer layer non-metal sleeve, so that the cement-free cementing well is convenient to remove, the influence on mechanical mining is reduced to the minimum, the cost can be saved, the method is particularly suitable for a high-gas coal mine pre-extraction horizontal well, and a drilling and completion scheme is provided for solving the coal mine pre-extraction problem in advance, economically and reliably.
Specifically, in the present embodiment, as shown in fig. 1 and 2, the outer layer non-metallic casing 1 is suspended within the split metallic casing 7 using the outer layer casing hanger 5. The outer-layer non-metal casing pipe is hung through the hanger, so that the device is convenient to install and fix, and the stable and reliable structure can be ensured. Further, in this embodiment, a sealing device is provided between the outer casing hanger 5 and the outer non-metallic casing 1. The sealing performance of the whole device can be effectively guaranteed through the sealing device, and the influence on the reliability of well completion operation is avoided.
As shown in fig. 1 and 2, specifically, in the present embodiment, the inner metal casing 2 is suspended in the split metal casing 7 by using an inner casing hanger 6, and the inner casing hanger 6 is provided with a circulation passage 61. Hang outer non-metallic sleeve pipe through the hanger, the installation and the fixing of the device of being convenient for, and can guarantee stable in structure reliably, and can effectively ensure to establish fluid circulation passageway between inlayer metallic sleeve pipe and the outer non-metallic sleeve pipe through circulation passageway. Further, in this embodiment, a sealing means is provided between the inner casing hanger 6 and the inner metal casing 2. The sealing performance of the whole device can be effectively guaranteed through the sealing device, and the influence on the reliability of well completion operation is avoided. Specifically, the inner casing hanger 6 is provided with a seal groove 62 to facilitate the arrangement of a sealing means such as a seal ring.
Specifically, as shown in fig. 1 and 2, in the present embodiment, a check valve 31 is provided in the inner metal sleeve 2 at a position near both ends. The structure can ensure the stable and reliable processes of well completion operation and well washing operation, and effectively avoid the reflux generated in the fluid circulation process.
Example 2
As shown in fig. 1 to 3, the method for completing a coal bed gas horizontal well according to an embodiment of the present invention is implemented by using the apparatus 10 described above, and specifically includes the following steps: s01, completing horizontal well drilling by adopting a three-opening structure: and (3) cementing after the metal casing is laid at the first opening, cementing and deflecting after the metal casing 7 is laid at the second opening until the coal seam roof is nearly horizontal, and drilling to the preset length at the position of the coal seam, which is close to the horizontal position, of the third opening. S02, well completion operation: the three openings are arranged in the device 10 and are suspended in the two openings of the metal sleeve 7. And S03, well washing operation.
According to the method for completing the coal bed gas horizontal well, which is disclosed by the embodiment of the invention, due to the implementation of the device, the problem of reentry of the horizontal section after the completion of the coal bed gas horizontal well is solved in an insertion mode, the blockage of the horizontal section in the later period is solved, and a circulating channel of the horizontal section is provided for well washing and yield increasing measures. When coal is mined after gas pre-extraction, the inner layer steel sleeve is cemented without cement and is wrapped by the outer layer non-metal sleeve, so that the cement-free cementing well is convenient to remove, the influence on mechanical mining is reduced to the minimum, the cost can be saved, the method is particularly suitable for a high-gas coal mine pre-extraction horizontal well, and a drilling and completion scheme is provided for solving the coal mine pre-extraction problem in advance, economically and reliably.
Further, in this embodiment, in step S03, the oil pipe and the insert 8 are first lowered, the well is lowered to a position close to the insert port 63 of the inner casing hanger 6, the pump is started to flush the insert port 63 to the wellhead fluid, the circulation is performed for 30min until the water quality at the inlet and outlet is reached, then the well is lowered to 2T, and the insert 8 is inserted into the insert port 63 of the inner casing hanger 6 to start the well-flushing operation. The insertion opening is washed clean before the well washing operation, so that the sealing performance of the subsequent insertion head and the insertion opening is facilitated, and the smooth operation of the well washing operation is prevented from being influenced.
Further, in this embodiment, in step S03, before the well flushing operation is started, the ground pump oil pipe is used to pressurize the metal casing to 2 to 3MPa, the pressure is not reduced to be qualified for 15min to verify the insertion tightness, then the pressure is continuously increased to 4 to 5MPa, the check valve 31 in the inner metal casing 2 is opened, and the small displacement test circulation is performed until the liquid is discharged from the ground wellhead. Through the detection and the trial circulation of the early-stage sealing performance, the smooth operation of the well washing work can be ensured to a great extent.
Specifically, in the present embodiment, the well-flushing operation is performed by circulating the clear water with a large discharge amount until the water quality of the inlet and outlet is consistent.
Further, in this embodiment, in step S03, after the well flushing operation is completed, the pump is stopped on the ground, the pressure test is performed at 2-3 MPa after 5min until the check valve 31 is closed and the pressure is not reduced to be qualified after 15min to verify the sealing performance of the check valve 31, and then the insertion head 8 is pulled out to complete the well flushing operation after tripping out. Through the detection of the sealing performance of the subsequent control valve, the smooth operation of the next completion operation and well flushing operation can be ensured.
According to the embodiment, the double-layer casing is arranged in the horizontal section of the coal bed gas horizontal well, so that the problems of reentering, well washing, yield increasing measures and the like of the horizontal section after completion of the coal bed gas horizontal well are solved, when coal is mined after gas is pre-extracted, the inner-layer metal casing is cemented without cement and is wrapped by the outer-layer non-metal casing, so that the removal is convenient, and the influence on mechanized coal mining is reduced to the minimum.
While the invention has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. It is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (10)
1. The device for completing the coalbed methane horizontal well is characterized by comprising an outer-layer non-metal casing and an inner-layer metal casing; wherein the content of the first and second substances,
the inner-layer metal sleeve is positioned in the outer-layer non-metal sleeve, and the outer-layer non-metal sleeve and the inner-layer metal sleeve are both suspended in the secondary metal sleeve;
a control valve is arranged in the inner-layer metal sleeve, and a circulating channel can be established between the outer-layer non-metal sleeve and the inner-layer metal sleeve.
2. The apparatus of claim 1, wherein the outer non-metallic casing is suspended within the split metal casing using an outer casing hanger.
3. The apparatus of claim 2, wherein a sealing means is provided between the outer casing hanger and the outer non-metallic casing.
4. The apparatus of any one of claims 1 to 3, wherein the inner metal casing is suspended within the double metal casing using an inner casing hanger, the inner casing hanger having a circulation channel provided thereon.
5. The apparatus of claim 4, wherein a sealing device is provided between the inner casing hanger and the inner metal casing.
6. An apparatus for completion of a coalbed methane horizontal well according to any of claims 1 to 3, characterized in that a check valve is provided in the inner metal casing at a position close to both ends.
7. A method for completing a coal bed gas horizontal well, carried out using the apparatus of any one of claims 1 to 6, comprising the steps of:
s01, completing horizontal well drilling by adopting a three-opening structure: cementing after a metal casing is laid, deflecting until the coal seam roof is nearly horizontal and laying the metal casing, cementing, and horizontally drilling the third opening in the coal seam to a preset length;
s02, well completion operation: three openings into which the device of any one of claims 1 to 6 is suspended in a two-opening metal sleeve;
and S03, well washing operation.
8. The method of claim 7, wherein in step S03, the tubing and the insert head are first lowered, the well is lowered to a position close to the insert opening of the inner casing hanger, the pump is started to flush the insert opening for a preset time, and then the well is lowered to a preset pressure range to insert the insert head into the insert opening of the inner casing hanger to start the well flushing operation.
9. The method of claim 8, wherein in step S03, before starting the well washing operation, the well is pressure tested within a preset pressure range and a preset time to verify the plugging tightness, and then the pressure is continuously increased to the preset pressure range to open the control valve in the inner metal casing until the outlet of the ground well head completes the test cycle.
10. The method of claim 8, wherein in step S03, after the well flushing operation is completed, the surface stops pumping, waits for a predetermined period of time until the control valve is closed, tests the pressure within a predetermined pressure range and a predetermined period of time to verify the sealing of the control valve, and then pulls out the insert head to complete the well flushing operation.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110112840.7A CN112963120A (en) | 2021-01-27 | 2021-01-27 | Device and method for coal bed gas horizontal well completion |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110112840.7A CN112963120A (en) | 2021-01-27 | 2021-01-27 | Device and method for coal bed gas horizontal well completion |
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Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000027560A1 (en) * | 1998-11-10 | 2000-05-18 | Ashland Inc. | Multiple layered sleeves and their uses |
| CN200940768Y (en) * | 2005-11-04 | 2007-08-29 | 仲文旭 | Double pipe underground natural gas high pressure gas storage well |
| CN101994503A (en) * | 2010-09-17 | 2011-03-30 | 北京奥瑞安能源技术开发有限公司 | Production increasing method of coalbed gas |
| CN102477850A (en) * | 2010-11-23 | 2012-05-30 | 淮南矿业(集团)有限责任公司 | Method and system for fixing coal-bed gas extraction wells |
| CN103711473A (en) * | 2013-12-30 | 2014-04-09 | 中国石油集团渤海钻探工程有限公司 | Double-circulation relay type method for drilling and completing coal seam composite well |
| CN103953386A (en) * | 2014-03-12 | 2014-07-30 | 淮北矿业（集团）勘探工程有限责任公司 | Upstream-blocking and downstream-seepage method for extracting gas in mining area |
| CN105201458A (en) * | 2015-11-06 | 2015-12-30 | 中国海洋石油总公司 | Well completion method for glass fiber reinforced plastic sieve tube of coal bed gas horizontal well |
| CN206309331U (en) * | 2016-11-30 | 2017-07-07 | 中国石油天然气股份有限公司 | Casing hanger |
| CN206503618U (en) * | 2017-02-17 | 2017-09-19 | 四川新明塑业有限公司 | Bilayer pressure wind water gas extraction sleeve pipe |
| CN207048742U (en) * | 2017-08-01 | 2018-02-27 | 山西晋城无烟煤矿业集团有限责任公司 | A kind of drilled well bore structure for weakening coal seam tight roof |
| US20200340335A1 (en) * | 2018-04-28 | 2020-10-29 | China University Of Mining And Technology | System for extracting gas from tectonically-deformed coal seam in-situ by depressurizing horizontal well cavity |
| CN112253070A (en) * | 2020-10-10 | 2021-01-22 | 中煤科工集团西安研究院有限公司 | Method for eliminating outburst by sectional seam-making and coal-washing of horizontal well in linkage mode of top and bottom of thick coal seam |
-
2021
- 2021-01-27 CN CN202110112840.7A patent/CN112963120A/en active Pending
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000027560A1 (en) * | 1998-11-10 | 2000-05-18 | Ashland Inc. | Multiple layered sleeves and their uses |
| CN200940768Y (en) * | 2005-11-04 | 2007-08-29 | 仲文旭 | Double pipe underground natural gas high pressure gas storage well |
| CN101994503A (en) * | 2010-09-17 | 2011-03-30 | 北京奥瑞安能源技术开发有限公司 | Production increasing method of coalbed gas |
| CN102477850A (en) * | 2010-11-23 | 2012-05-30 | 淮南矿业(集团)有限责任公司 | Method and system for fixing coal-bed gas extraction wells |
| CN103711473A (en) * | 2013-12-30 | 2014-04-09 | 中国石油集团渤海钻探工程有限公司 | Double-circulation relay type method for drilling and completing coal seam composite well |
| CN103953386A (en) * | 2014-03-12 | 2014-07-30 | 淮北矿业（集团）勘探工程有限责任公司 | Upstream-blocking and downstream-seepage method for extracting gas in mining area |
| CN105201458A (en) * | 2015-11-06 | 2015-12-30 | 中国海洋石油总公司 | Well completion method for glass fiber reinforced plastic sieve tube of coal bed gas horizontal well |
| CN206309331U (en) * | 2016-11-30 | 2017-07-07 | 中国石油天然气股份有限公司 | Casing hanger |
| CN206503618U (en) * | 2017-02-17 | 2017-09-19 | 四川新明塑业有限公司 | Bilayer pressure wind water gas extraction sleeve pipe |
| CN207048742U (en) * | 2017-08-01 | 2018-02-27 | 山西晋城无烟煤矿业集团有限责任公司 | A kind of drilled well bore structure for weakening coal seam tight roof |
| US20200340335A1 (en) * | 2018-04-28 | 2020-10-29 | China University Of Mining And Technology | System for extracting gas from tectonically-deformed coal seam in-situ by depressurizing horizontal well cavity |
| CN112253070A (en) * | 2020-10-10 | 2021-01-22 | 中煤科工集团西安研究院有限公司 | Method for eliminating outburst by sectional seam-making and coal-washing of horizontal well in linkage mode of top and bottom of thick coal seam |
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Application publication date: 20210615 |