CN112796712A - Comprehensive extraction method for fracturing of goaf and coal seam - Google Patents
Comprehensive extraction method for fracturing of goaf and coal seam Download PDFInfo
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- CN112796712A CN112796712A CN202110327247.4A CN202110327247A CN112796712A CN 112796712 A CN112796712 A CN 112796712A CN 202110327247 A CN202110327247 A CN 202110327247A CN 112796712 A CN112796712 A CN 112796712A
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- 239000003245 coal Substances 0.000 title claims abstract description 55
- 238000000605 extraction Methods 0.000 title claims abstract description 20
- 238000004519 manufacturing process Methods 0.000 claims abstract description 17
- 239000004568 cement Substances 0.000 claims abstract description 12
- 238000005553 drilling Methods 0.000 claims abstract description 12
- 239000004576 sand Substances 0.000 claims abstract description 8
- 238000003825 pressing Methods 0.000 claims abstract description 5
- 238000000034 method Methods 0.000 claims description 5
- 238000005065 mining Methods 0.000 claims description 3
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/006—Production of coal-bed methane
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
- E21B43/267—Methods for stimulating production by forming crevices or fractures reinforcing fractures by propping
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- Physics & Mathematics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Drilling And Exploitation, And Mining Machines And Methods (AREA)
Abstract
The invention belongs to the technical field of coal bed gas exploration and development of a goaf of a abandoned mine, and particularly relates to a fracturing comprehensive extraction method of the goaf and a coal bed gas well. The technical problem that the coal bed gas in a goaf cannot be synchronously extracted with the coal bed gas in a coal bed in the conventional coal bed gas extraction is solved. A comprehensive extraction method for fracturing of a goaf and a coal seam comprises the following steps: (1) drilling a shaft from the ground to 20m below the bedrock, putting a surface sleeve into the shaft, and raising the well cementation cement to the ground; (2) drilling a second open shaft from the bottom of the first open shaft to 20m below the coal seam, putting a production sleeve into the second open shaft, and raising the well cementation cement to the ground; (3) perforating the production sleeve and the surrounding coal seam by using perforating bullets, enabling the perforating holes to be connected with the shaft and the adjacent goaf, and pressing fracturing sand into the perforating holes to support fracturing; (4) the top of the first open well cylinder is connected with extraction equipment for extracting coal bed gas.
Description
Technical Field
The invention belongs to the technical field of coal bed gas exploration and development of a goaf of a abandoned mine, and particularly relates to a fracturing comprehensive extraction method of the goaf and a coal bed gas well.
Background
With the increasing number of coal mine abandoned mines and the promotion and development of the coal bed gas industry, more and more enterprises are invested in the coal bed gas extraction of the abandoned mines. In the later stage of extraction of the coal bed gas of the abandoned mine, the area of a goaf interfering the coal bed is limited, and the goaf is a natural depressurization space for the coal bed gas. In order to combine the development of the coal-bed gas well with the development of the coal-bed gas in the goaf, the method is designed to solve the problem so as to facilitate the coal-bed gas well to achieve the effects of increasing the yield and the efficiency.
Disclosure of Invention
The invention provides a fracturing comprehensive extraction method of a goaf and a coal bed gas well, aiming at solving the technical problem that the coal bed gas in the goaf cannot be synchronously extracted with the coal bed gas in a coal bed in the conventional coal bed gas extraction.
The invention is realized by adopting the following technical scheme: a comprehensive extraction method for fracturing of a goaf and a coal seam comprises the following steps: (1) drilling a shaft from the ground to 20m below the bedrock, putting a surface sleeve into the shaft, and raising the well cementation cement to the ground; (2) drilling a second open shaft from the bottom of the first open shaft to 20m below the coal seam, putting a production sleeve into the second open shaft, and raising the well cementation cement to the ground; (3) perforating the production sleeve and the surrounding coal seam by using perforating bullets, enabling the perforating holes to be connected with the shaft and the adjacent goaf, and pressing fracturing sand into the perforating holes to support fracturing; (4) the top of the first open well cylinder is connected with extraction equipment for extracting coal bed gas.
The working principle of the invention is as follows: drilling sites are selected on coal seams which are 150m away from a goaf, a mining space 311mm drill bit drills to 20m below bedrock, a 244.5mm meter sleeve is put to the bottom of a well, and well cementing cement is put to return to the ground. Secondly, drilling a 215.9mm drill bit to 10m below the coal seam, putting a 139.7mm production casing pipe, and putting well-cementing cement to return to the ground. And (3) perforating the production casing and the coal seam by using perforating bullets, connecting the perforating holes with the shaft and the goaf, and pressing fracturing sand into the holes to support fracturing.
Further, the drilling site is horizontally spaced 150 degrees from the goaf+10m of coal seam; crack length 150m+10m。
Further, a drilled shaft with the outer diameter of 311mm is drilled by a drill bit with the diameter of 311mm, and the outer diameter of the watch sleeve is 244.5 mm; the outer diameter of the two-opening well casing is 215.9mm, the two-opening well casing is drilled by a 215.9mm drill bit, and the outer diameter of the production casing is 139.7 mm.
The method can effectively solve the problem of improving the coalbed methane gas production effect of the coalbed methane well and the goaf well.
Compared with the prior art, the invention has the following advantages:
1, effectively combining a conventional coal bed gas well with a goaf coal bed gas well;
2, the method helps to increase the yield and efficiency of the coal bed gas, scientific research and the like;
3, the pressure drop funnel for extracting the coal bed gas is greatly improved, and the extraction efficiency is increased.
Drawings
FIG. 1 is a schematic structural diagram of a fracturing comprehensive extraction method for a goaf and a coal-bed gas well.
1-a first shaft, 2-a surface sleeve, 3-a second shaft, 4-a production sleeve, 5-a coal bed, 6-a goaf, 7-a fracturing crack and 8-fracturing sand.
Detailed Description
In conjunction with FIG. 1: a fracturing comprehensive extraction method for a goaf and a coal bed gas well comprises a first opening 311mm shaft, a surface sleeve 244.5mm, a second opening 215.9mm shaft, a production sleeve 139.7mm, a coal bed, the goaf, a fracturing crack and fracturing sand; the well bore is drilled to 20m below bedrock by a 311mm drill bit; the surface sleeve with the diameter of 244.5mm is put into a well bore with the diameter of 311mm, and the well cementation cement returns to the ground; the second 215.9mm shaft is drilled to 20m below the coal bed by a 215.9mm drill bit, and the well cementation cement returns to the ground; filling fracturing sand in the fracturing fracture; the fracturing fractures are generated by hydraulic fracturing (after perforation, ground fracturing equipment presses the stratum through a perforation hole to form fractures), and the length of each fracture is about 150 m; the fracturing fracture is connected with the shaft and the goaf. A plurality of perforation holes are arranged around the production sleeve from top to bottom, and the cracks between the original coal seam and the goaf are conducted to the maximum extent. The perforation holes on the left side of the drawing are deep into the coal seam, and the perforation holes on the right side are communicated with an adjacent goaf.
The working principle is as follows: drilling sites are selected on coal seams which are 150m away from a goaf, a mining space 311mm drill bit drills to 20m below bedrock, a 244.5mm meter sleeve is put to the bottom of a well, and well cementing cement is put to return to the ground. Secondly, drilling a 215.9mm drill bit to 10m below the coal seam, putting a 139.7mm production casing pipe, and putting well-cementing cement to return to the ground. And (3) perforating the production casing and the coal seam by using perforating bullets, connecting the perforating holes with the shaft and the goaf, and pressing fracturing sand into the holes to support fracturing.
Claims (5)
1. A comprehensive extraction method for fracturing of a goaf and a coal seam is characterized by comprising the following steps: (1) drilling a shaft from the ground to 20m below the bedrock, putting a surface sleeve into the shaft, and raising the well cementation cement to the ground; (2) drilling a second open shaft from the bottom of the first open shaft to 20m below the coal seam, putting a production sleeve into the second open shaft, and raising the well cementation cement to the ground; (3)
perforating the production sleeve and the surrounding coal seam by using perforating bullets, enabling the perforating holes to be connected with the shaft and the adjacent goaf, and pressing fracturing sand into the perforating holes to support fracturing; (4) the top of the first open well cylinder is connected with extraction equipment for extracting coal bed gas.
2. The method for comprehensively extracting and mining the goaf and coal seam fracturing, according to claim 1, wherein the drilling site is horizontally spaced from the goaf by 150 degrees centigrade+10m of coal seam; crack length 150m+10m。
3. The extraction method of the goaf and coal seam fracturing comprehensive utilization as claimed in claim 1 or 2, characterized in that a shaft with an outer diameter of 311mm is drilled by a drill bit with a diameter of 311mm, and the outer diameter of a surface sleeve is 244.5 mm; the outer diameter of the two-opening well casing is 215.9mm, the two-opening well casing is drilled by a 215.9mm drill bit, and the outer diameter of the production casing is 139.7 mm.
4. The extraction method for the goaf and coal seam fracturing combination as claimed in claim 1 or 2, wherein the fracturing fracture is generated by hydraulic fracturing.
5. The method for comprehensively extracting the coal seam from the goaf as claimed in claim 1 or 2, wherein a plurality of perforation holes are arranged around the production sleeve from top to bottom.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110327247.4A CN112796712B (en) | 2021-03-26 | 2021-03-26 | Comprehensive extraction method for fracturing of goaf and coal seam |
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| CN202110327247.4A CN112796712B (en) | 2021-03-26 | 2021-03-26 | Comprehensive extraction method for fracturing of goaf and coal seam |
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| CN112796712A true CN112796712A (en) | 2021-05-14 |
| CN112796712B CN112796712B (en) | 2022-07-26 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114165196A (en) * | 2021-12-06 | 2022-03-11 | 中国矿业大学 | Comprehensive efficient extraction method for closing coal bed gas in-situ-goaf of coal mine |
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2021
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| Publication number | Priority date | Publication date | Assignee | Title |
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Effective date of registration: 20231107 Address after: 030006 No.170, Jinyang street, Xiaodian District, Taiyuan City, Shanxi Province Patentee after: Shanxi coal geological exploration and Research Institute Co.,Ltd. Address before: 030006 No.170, Jinyang street, Taiyuan City, Shanxi Province Patentee before: SHANXI COAL GEOLOGY SURVEYS Research Institute |