CN116940745A - Well type structure for butt joint of coal bed gas at near end of single well field and opening method - Google Patents
Well type structure for butt joint of coal bed gas at near end of single well field and opening method Download PDFInfo
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- CN116940745A CN116940745A CN202380009042.9A CN202380009042A CN116940745A CN 116940745 A CN116940745 A CN 116940745A CN 202380009042 A CN202380009042 A CN 202380009042A CN 116940745 A CN116940745 A CN 116940745A
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- 239000003245 coal Substances 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims abstract description 24
- 210000001503 joint Anatomy 0.000 title claims abstract description 23
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 34
- 238000010276 construction Methods 0.000 claims abstract description 32
- 238000004519 manufacturing process Methods 0.000 claims abstract description 20
- 238000004891 communication Methods 0.000 claims abstract description 6
- 238000005553 drilling Methods 0.000 claims description 32
- 239000004568 cement Substances 0.000 claims description 21
- 239000004576 sand Substances 0.000 claims description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 238000012360 testing method Methods 0.000 claims description 4
- 230000000694 effects Effects 0.000 abstract description 7
- 238000000605 extraction Methods 0.000 abstract description 7
- 238000011161 development Methods 0.000 abstract description 6
- 238000002360 preparation method Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000002817 coal dust Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000011152 fibreglass Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
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Abstract
The application discloses a well type structure for butt joint of coal bed gas at a near end of a single well site, which comprises an engineering well and a drainage well, wherein the engineering well and the drainage well are arranged in the same well site, and the engineering well and the drainage well can be in butt joint communication. The application also discloses a method for opening the well structure by adopting the single well site near end to butt coal bed gas. The application carries out construction of the engineering well and the drainage well in the same well site, and communicates the engineering well with the drainage well, when the screw pump enters the drainage well from the drainage well, the two wells simultaneously produce gas. Compared with a U-shaped well, the application saves one well site, saves 1 pilot hole for construction, has simple coalbed methane conveying pipeline and reduces development cost; compared with an L-shaped horizontal well, the dog leg degree is reduced, the screw pump is lowered below the elevation of the point A, and the gas production effect of gas extraction is generally improved.
Description
Technical Field
The application relates to the technical field of current sampling, in particular to a well type structure for butt joint of coal bed gas at a near end of a single well field and a method for opening the same.
Background
Coal bed gas is adsorption gas, and coal reservoirs have low gas permeability and low abundance, and a horizontal well development mode is generally adopted to improve development efficiency and gas yield. The well type structures of the horizontal well adopted at present are L-shaped and U-shaped. The L-shaped well is a horizontal well, two ends of the horizontal section are respectively positioned at the bottom part and the high part of the construction, and water and gas are discharged and produced at the well mouth. The U-shaped well consists of a vertical well and a horizontal well, the vertical well is drilled first, then the horizontal well is drilled, the complete penetration of the U-shaped well is realized through the butt joint of the horizontal well and the vertical well, in the practical implementation process, the horizontal well is positioned at the high position of the target layer structure, the vertical well is positioned at the low position of the structure, the vertical well is drained, and the horizontal well and the vertical well simultaneously produce gas.
The L-shaped well has the advantages that one vertical well is constructed less than the U-shaped well, one well site is constructed less, and the investment is low; however, the L-shaped well has the defects of serious eccentric wear, large torque, difficult pump starting, low pump efficiency, short pump service life, high pump detection frequency and serious influence on the drainage effect caused by large dogleg degree of the well body; the screw pump is not in a horizontal section, so that the waste pressure is high, and the extraction rate of the coal bed gas is low.
The U-shaped well has the advantages that the screw pump can be below a target layer, the service life of the drainage pump is long, and the drainage efficiency is high; the U-shaped well has the defects that one more vertical well is constructed than the L-shaped well, two well sites are required to be constructed, a coal bed gas conveying pipeline is long, and extraction efficiency is low; the two well sites and the corresponding roads have the characteristics of large difficulty in construction preparation, large engineering investment, long construction period, and serious land waste.
The application patent application with publication number of CN112901120A discloses a coalbed methane U-shaped well gas injection circulation negative pressure extraction device and a method, and the application improves the gas production efficiency by injecting the mixed gas of coalbed methane and high-temperature vapor produced by the coalbed methane into a coalbed methane reservoir and combining ground negative pressure extraction. The U-well used therein is still of conventional construction and the above-mentioned problems remain.
Disclosure of Invention
The technical problems to be solved by the application are as follows: the problems that the existing L-shaped well is poor in drainage effect, the U-shaped well coal bed gas conveying pipeline is long, the drainage efficiency is low and the like are solved.
In order to solve the technical problems, the application provides the following technical scheme:
the utility model provides a well type structure of single well site near-end butt joint coalbed methane, includes engineering well and drainage well, engineering well and drainage well are seted up in same well site, engineering well and drainage well can dock the intercommunication.
The advantages are that: the application carries out construction of the engineering well and the drainage well in the same well site, and communicates the engineering well with the drainage well, when the screw pump enters the drainage well from the drainage well, the two wells simultaneously produce gas. Compared with a U-shaped well, the application saves one well site, saves 1 pilot hole for construction, has simple coalbed methane conveying pipeline and reduces development cost; compared with an L-shaped horizontal well, the dog leg degree is reduced, and the gas production effect is generally improved.
Preferably, the drainage well adopts a two-well structure, and comprises a deflecting section which is communicated with the engineering well at a landing site A.
Preferably, the engineered well is an L-well.
Preferably, the engineering well adopts a three-well structure, the engineering well comprises a horizontal section destination layer, two ends of the horizontal section destination layer are respectively a landing site A and a landing site B, and the landing site A is a point position for being in butt joint with the drainage well.
Preferably, the landing point A of the horizontal section destination layer of the L-shaped well is positioned at the low position of the coal seam construction, and the landing point B is positioned at the high position of the coal seam construction.
Preferably, the horizontal leg of the engineered well can be located in a roof of a coal seam, a coal seam or a floor of a coal seam.
The application also discloses a method for opening the well structure by adopting the single well site near-end butt joint coal bed gas, which comprises the following steps:
s1, drilling construction of a drainage well is carried out in a set well site;
s2, drilling construction of the engineering well is carried out in the same well site, and the engineering well is communicated with the drainage well;
s3, water is discharged by a discharge pump under the discharge well, and gas is simultaneously produced in the discharge well and the engineering well.
Preferably, the drilling construction process of the drainage well in step S1 includes:
s11, drilling to 10m below a bedrock layer, putting into a surface sleeve, and returning well cementation cement to the ground;
s12, two-step opening: drilling to an inclined length of 30-50 m below the landing site A, putting into a production casing, and returning well cementation cement to 200m above a target layer of a horizontal section; and (3) hole making and reaming are carried out at a landing site A at the deflecting section, wherein the diameter of the hole is larger than 0.5m.
Preferably, the dog leg degree of the deflecting section in the two-open process of the drainage well is not more than 1 degree/30 m, and the azimuth angle is kept unchanged.
Preferably, the drilling construction process of the engineering well in the step S2 includes:
s21, opening: drilling to 10m below the bedrock layer, putting into a surface sleeve, and returning the well cementation cement to the ground;
s22, two-step: drilling to a horizontal section destination layer, putting a technical sleeve into the horizontal section destination layer, and returning well cementation cement to 200m above the horizontal section destination layer;
s23, three steps: increasing inclination drilling to a designed depth after directionally butting to a landing site A of a drainage well; in order to facilitate the well cementation of the main well hole of the horizontal well, sand is filled in a cavity formed by the drainage and production well after the main well hole is communicated, the sand filling depth is higher than the top surface of the cavity formed, a cement plug is arranged on the cavity after sand filling, and after the pressure test is qualified, the casing is sleeved in the main well hole of the horizontal well for well cementation.
Compared with the prior art, the application has the beneficial effects that:
(1) The application combines the advantages and disadvantages of the L-shaped horizontal well and the U-shaped horizontal well, and the drainage well and the L-shaped well are in butt joint communication at the landing site A by carrying out construction of the engineering well and the drainage well in the same well site, when the screw pump enters the drainage well from the drainage well, the two wells simultaneously produce gas. Compared with a U-shaped well, the application saves one well site, saves 1 pilot hole for construction, has simple coalbed methane conveying pipeline and reduces development cost; compared with an L-shaped horizontal well, the dog leg degree is reduced, the screw pump is lowered below the elevation of the point A, and the gas production effect of gas extraction is generally improved.
(2) The well type structure reduces well sites, drilling machines, roads, underground two-open-hole guide construction and drainage pipelines, reduces the preparation time of well construction, improves the applicability of the well type structure in mountain areas and hilly areas, reduces occupied land, reduces cost and increases efficiency.
(3) The drainage and production well has small dogleg degree, can reduce the times of pump detection and increase the drainage and production stability.
(4) The drainage pump of the application is arranged below the coal bed, so that the recovery ratio of coal bed gas is improved.
Drawings
FIG. 1 is a schematic diagram of a first embodiment of the present application;
in the figure: 1. a drainage well; 11. a deflecting section; 2. an engineering well; 21. a horizontal segment destination layer; 3. a well site; 4. and (3) a coal seam.
Detailed Description
In order to facilitate the understanding of the technical scheme of the present application by those skilled in the art, the technical scheme of the present application will be further described with reference to the accompanying drawings.
The terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
Example 1
Referring to fig. 1, the embodiment discloses a well structure for butt joint of coalbed methane at a near end of a single well site, which comprises an engineering well 2 and a drainage well 1, wherein the engineering well 2 and the drainage well 1 are arranged in the same well site 3, and the engineering well 2 and the drainage well 1 can be in butt joint communication.
The drainage well 1 adopts a two-open well structure and comprises a deflecting section 11, and the deflecting section 11 is communicated with the engineering well 2 at a landing site A. Specifically, one opening of the drainage and production well 1 is a vertical section which is vertically downward, and the other opening of the drainage and production well 1 is an inclined deflecting section 11.
In some embodiments, the whipstock section 11 dog leg of the drainage well 1 does not exceed 1 °/30m, leaving the azimuth unchanged. The number of times of pump inspection is reduced, and the drainage stability is improved.
In a specific embodiment of this embodiment, the two-open drilling construction process of the drainage well 1 is: the well site 3 is used as the foundation, the well is drilled to 10m below the bedrock layer, the surface casing is put in, and the well cementation cement is raised to the ground. Drilling to an inclined length of 30-50 m below the landing site A, putting into a production casing, and returning well cementation cement to a level section above the target layer 21 by 200m; hole making and reaming are carried out at the landing point A of the deflecting section 11, and the diameter of the hole is larger than 0.5m. Wherein, the target butt joint interval of the drainage well 1 and the engineering well 2 adopts a sleeve pipe for cutting and producing, such as a glass fiber reinforced plastic pipe or a PVC pipe. The drainage and production well 1 of the embodiment enables the drainage and production pump to be capable of being lowered below the coal seam 4 by 30-50 m below the landing site A, and improves the gas recovery ratio of the coal seam 4.
The engineered well 2 is an L-shaped well. The engineering well 2 adopts a three-well structure, the engineering well 2 comprises a horizontal section destination layer 21, the two ends of the horizontal section destination layer 21 are respectively a landing site A and a landing site B, and the landing site A is a point position for being in butt joint with the drainage well 1.
In the specific embodiment of the embodiment, the well site 3 is used as the foundation, the well is drilled to 10m below a bedrock layer, a surface casing is put in, and the well cementation cement is raised to the ground. The second step is to drill to the horizontal section target layer 21 on the basis of the first step, insert a technical sleeve, and return the well cementation cement to 200m above the horizontal section target layer 21. The three-way is to increase the inclined drilling to the designed depth after the directional butt joint is carried out on the landing site A of the drainage well 1; in order to facilitate the well cementation of the main well hole of the horizontal well, sand is filled in the cavity formed by the inclined well after the main well hole is communicated, the sand filling depth is higher than the top surface of the cavity formed by the inclined well, a cement plug is arranged on the cavity after sand filling, and after the pressure test is qualified, the sleeve is put under the main well hole of the horizontal well for well cementation.
In some embodiments, the horizontal leg of the engineered well 2 can be located in a roof of a coal seam, or a floor of a coal seam.
In some embodiments, landing site A is located at a low portion of the coal seam formation and landing site B is located at a high portion of the coal seam formation. The setting is favorable for the fluid to carry sand powder and coal dust in a shaft to flow from a landing site B at a high point to a landing site A at a low point in the drainage process, and finally the sand is deposited in a sand setting pipe at the lower part of the landing site A, and the sand setting pipe is taken out to the ground for cleaning after a certain time of drainage. Prevent coal dust and the like from accumulating in a shaft to cause the blockage of the shaft and block a seepage channel. Meanwhile, the landing site A is positioned at a low position, so that the residual pressure of the stratum can be reduced to the greatest extent, and the gas yield and the coal seam gas control effect are improved.
The embodiment combines the advantages and disadvantages of the L-shaped horizontal well and the U-shaped horizontal well, the engineering well 2 and the drainage well 1 are constructed in the same well site 3, the drainage well 1 and the L-shaped well are in butt joint communication at the landing site A, and when the screw pump enters and discharges water from the drainage well 1, two wells simultaneously produce gas. Compared with a U-shaped well, the application saves one well site 3, saves 1 pilot hole for construction, has simple coalbed methane conveying pipeline and reduces development cost; compared with an L-shaped horizontal well, the dog leg degree is reduced, the screw pump is lowered below the elevation of the point A, and the gas production effect of gas extraction is generally improved.
The well type structure of the embodiment reduces the construction of well sites 3, drilling machines, roads and underground two open guide holes and drainage pipelines, reduces the preparation time of well construction, improves the applicability of the well type structure in mountain areas and hilly areas, reduces occupied land, reduces cost and increases efficiency.
Example two
The embodiment also discloses a method for opening the well structure of the single well site 3 near-end butt joint coal bed gas, which comprises the following steps:
s1, drilling construction of the drainage well 1 is carried out in a set well site 3.
S2, drilling construction of the engineering well 2 is carried out in the same well site 3, and the engineering well 2 is communicated with the drainage well 1.
S3, a drainage pump is arranged under the drainage well 1 to drain water, and gas is simultaneously produced in the drainage well 1 and the engineering well 2.
The drilling construction process of the drainage and production well 1 in the step S1 comprises the following steps:
s11, drilling to 10m below the bedrock layer, putting into a surface sleeve, and returning the well cementation cement to the ground.
S12, two-step opening: drilling to an inclined length of 30-50 m below the landing site A, putting into a production casing, and returning the well cementation cement to 200m above the horizontal section target layer 21; hole making and reaming are carried out at the landing site A of the 11 sections of the target deflecting section, and the diameter of the hole is larger than 0.5m.
The dogleg degree of the deflecting section 11 in the two-open process of the drainage well 1 is not more than 1 degree/30 m, and the azimuth angle is kept unchanged.
The drilling construction process of the engineering well 2 in the step S2 includes:
s21, opening: drilling to 10m below the bedrock layer, putting into a surface sleeve, and returning the well cementation cement to the ground.
S22, two-step: drilling to a horizontal section target layer 21, putting a technical sleeve into the horizontal section target layer 21, and returning the well cementation cement to 200m above the horizontal section target layer 21.
S23, three steps: increasing the inclination drilling to the designed depth after directionally butting to the landing site A of the drainage well 1; in order to facilitate the well cementation of the main well hole of the horizontal well, sand is filled in the cavity formed by the drainage and production well 1 after the main well hole is communicated, the sand filling depth is higher than the top surface of the cavity formed, a cement plug is arranged on the cavity after sand filling, and after the pressure test is qualified, the sleeve is put into the main well hole of the horizontal well for well cementation.
After the L-shaped well is subjected to staged fracturing, cement plugs are sequentially drilled through the drainage well 1 and the L-shaped well, and sand filling in the well is cleared through the well, so that the secondary communication with the vertical well is realized.
It will be evident to those skilled in the art that the application is not limited to the details of the foregoing illustrative embodiments, and that the present application may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
The above-described embodiments merely represent embodiments of the application, the scope of the application is not limited to the above-described embodiments, and it is obvious to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application.
Claims (10)
1. The utility model provides a well type structure of single well site near-end butt joint coalbed methane which characterized in that: the well site system comprises an engineering well (2) and a drainage well (1), wherein the engineering well (2) and the drainage well (1) are arranged in the same well site (3), and the engineering well (2) and the drainage well (1) can be in butt joint communication.
2. The single well site near end butted coal bed methane well structure of claim 1, wherein: the drainage well (1) adopts a two-open well structure and comprises a deflecting section (11), and the deflecting section (11) is communicated with the engineering well (2) at a landing site A.
3. The single well site near end butted coal bed methane well structure of claim 1, wherein: the engineering well (2) is an L-shaped well.
4. A single well site near end butted coal bed methane well structure according to claim 3, wherein: the engineering well (2) adopts a three-open well structure, the engineering well (2) comprises a horizontal section destination layer (21), two ends of the horizontal section destination layer (21) are respectively a landing point A and a landing point B, and the landing point A is a point position in butt joint with the drainage well (1).
5. The single well site near end butted coal bed methane well structure according to claim 4, wherein: the landing site A of the horizontal section target layer (21) of the L-shaped well is positioned at the low part of the coal seam construction, and the landing site B is positioned at the high part of the coal seam construction.
6. The single well site near end butted coal bed methane well structure according to claim 4, wherein: the horizontal section objective layer (21) of the engineering well (2) can be positioned in a coal seam roof, a coal seam or a coal seam floor.
7. A method for opening a well structure for butt joint of coal bed gas by adopting the near end of a single well site as claimed in any one of claims 1 to 6, which is characterized in that: the method comprises the following steps:
s1, drilling construction of a drainage well (1) is carried out in a set well site (3);
s2, drilling construction of the engineering well (2) is carried out in the same well site (3), and the engineering well (2) is communicated with the drainage well (1);
s3, a drainage pump is arranged in the drainage well (1) to drain water, and gas is produced simultaneously in the drainage well (1) and the engineering well (2).
8. The method for opening the well structure of the single well site near-end butt joint coal bed gas, which is characterized by comprising the following steps of: the drilling construction process of the drainage and production well (1) in the step S1 comprises the following steps:
s11, drilling to 10m below a bedrock layer, putting into a surface sleeve, and returning well cementation cement to the ground;
s12, two-step opening: drilling to an inclined length of 30-50 m below the landing site A, putting into a production casing, and returning well cementation cement to 200m above a horizontal section target layer (21); and (3) hole making and reaming are carried out at a landing site A at the deflecting section (11), wherein the diameter of the hole is larger than 0.5m.
9. The method for opening the well structure of the single well site near-end butt joint coal bed gas, which is characterized by comprising the following steps of: the dogleg degree of the deflecting section (11) in the two-open process of the drainage well (1) is not more than 1 degree/30 m, and the azimuth angle is kept unchanged.
10. The method of opening a well structure for Shan Jingchang near-end butt-joint of coalbed methane of claim 7, wherein: the drilling construction process of the engineering well (2) in the step S2 comprises the following steps:
s21, opening: drilling to 10m below the bedrock layer, putting into a surface sleeve, and returning the well cementation cement to the ground;
s22, two-step: drilling to a horizontal section target layer (21), putting a technical sleeve into the horizontal section target layer (21), and returning the well cementation cement to 200m above the horizontal section target layer (21);
s23, three steps: increasing inclined drilling to the designed depth after directionally butting to a landing point A of the drainage well (1); in order to facilitate the well cementation of the main well hole of the horizontal well, sand is filled in a cavity formed by the drainage and production well (1) after the main well hole is communicated, the sand filling depth is higher than the top surface of the cavity formed, a cement plug is arranged on the cavity after sand filling, and after the pressure test is qualified, the main well hole of the horizontal well is subjected to casing well cementation.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2023/090595 WO2024221221A1 (en) | 2023-04-25 | 2023-04-25 | Coalbed methane well-type structure communicated at proximal ends in single well site and forming method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116940745A true CN116940745A (en) | 2023-10-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202380009042.9A Pending CN116940745A (en) | 2023-04-25 | 2023-04-25 | Well type structure for butt joint of coal bed gas at near end of single well field and opening method |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN116940745A (en) |
| WO (1) | WO2024221221A1 (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102322252A (en) * | 2011-05-30 | 2012-01-18 | 北京奥瑞安能源技术开发有限公司 | Coal bed gas multi-branched horizontal well system and job practices thereof |
| CN102425397A (en) * | 2011-12-29 | 2012-04-25 | 郑州大学 | Method for exploiting coal-bed methane by utilizing water force of horizontal pinnate well of double well-shaft to scour, drill and relieve pressure |
| CN203035177U (en) * | 2012-11-12 | 2013-07-03 | 中国石油天然气股份有限公司 | Coal bed gas multi-branch horizontal well with communication point in top plate or bottom plate rock stratum |
| CN104912480A (en) * | 2015-04-30 | 2015-09-16 | 中煤科工集团西安研究院有限公司 | Drilling and completion method for coal bed gas near-end butt-joint horizontal well |
| CN107152261A (en) * | 2017-05-10 | 2017-09-12 | 中国神华能源股份有限公司 | Coal bed gas extraction system and method for construction |
| CN108086957A (en) * | 2017-12-23 | 2018-05-29 | 山西蓝焰煤层气集团有限责任公司 | A kind of method of the U-shaped coal bed gas well construction in double coal seams |
| CN113107589A (en) * | 2021-04-14 | 2021-07-13 | 中煤科工集团西安研究院有限公司 | Method for pre-draining water in advance on ground of coal seam roof aquifer |
-
2023
- 2023-04-25 CN CN202380009042.9A patent/CN116940745A/en active Pending
- 2023-04-25 WO PCT/CN2023/090595 patent/WO2024221221A1/en unknown
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102322252A (en) * | 2011-05-30 | 2012-01-18 | 北京奥瑞安能源技术开发有限公司 | Coal bed gas multi-branched horizontal well system and job practices thereof |
| CN102425397A (en) * | 2011-12-29 | 2012-04-25 | 郑州大学 | Method for exploiting coal-bed methane by utilizing water force of horizontal pinnate well of double well-shaft to scour, drill and relieve pressure |
| CN203035177U (en) * | 2012-11-12 | 2013-07-03 | 中国石油天然气股份有限公司 | Coal bed gas multi-branch horizontal well with communication point in top plate or bottom plate rock stratum |
| CN104912480A (en) * | 2015-04-30 | 2015-09-16 | 中煤科工集团西安研究院有限公司 | Drilling and completion method for coal bed gas near-end butt-joint horizontal well |
| CN107152261A (en) * | 2017-05-10 | 2017-09-12 | 中国神华能源股份有限公司 | Coal bed gas extraction system and method for construction |
| CN108086957A (en) * | 2017-12-23 | 2018-05-29 | 山西蓝焰煤层气集团有限责任公司 | A kind of method of the U-shaped coal bed gas well construction in double coal seams |
| CN113107589A (en) * | 2021-04-14 | 2021-07-13 | 中煤科工集团西安研究院有限公司 | Method for pre-draining water in advance on ground of coal seam roof aquifer |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2024221221A1 (en) | 2024-10-31 |
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