CN111927399A - Coal mine mining area gas extraction method - Google Patents
Coal mine mining area gas extraction method Download PDFInfo
- Publication number
- CN111927399A CN111927399A CN202010746378.1A CN202010746378A CN111927399A CN 111927399 A CN111927399 A CN 111927399A CN 202010746378 A CN202010746378 A CN 202010746378A CN 111927399 A CN111927399 A CN 111927399A
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- Prior art keywords
- ground
- drilling
- coal mine
- mining
- return airway
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- 239000003245 coal Substances 0.000 title claims abstract description 37
- 238000005065 mining Methods 0.000 title claims abstract description 28
- 238000000605 extraction Methods 0.000 title claims abstract description 12
- 238000005553 drilling Methods 0.000 claims abstract description 22
- 239000004568 cement Substances 0.000 claims abstract description 9
- 238000000034 method Methods 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 238000010276 construction Methods 0.000 abstract description 5
- 238000012876 topography Methods 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 238000009412 basement excavation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000000658 coextraction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
Images
Classifications
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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
- 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
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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
- E21B43/30—Specific pattern of wells, e.g. optimising the spacing of wells
- E21B43/305—Specific pattern of wells, e.g. optimising the spacing of wells comprising at least one inclined or horizontal well
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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
- E21B7/00—Special methods or apparatus for drilling
- E21B7/04—Directional drilling
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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
- E21B7/00—Special methods or apparatus for drilling
- E21B7/04—Directional drilling
- E21B7/046—Directional drilling horizontal drilling
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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
- E21B7/00—Special methods or apparatus for drilling
- E21B7/20—Driving or forcing casings or pipes into boreholes, e.g. sinking; Simultaneously drilling and casing boreholes
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F7/00—Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Geochemistry & Mineralogy (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Mechanical Engineering (AREA)
- Drilling And Exploitation, And Mining Machines And Methods (AREA)
Abstract
A coal mine mining area gas extraction method belongs to the technical field of underground gas treatment of coal mine mining, can solve the problems that the number of existing ground drilling straight well extraction construction wells is large, the ground is provided with more extraction equipment due to the condition of complex ground topography, and the positions and the hole numbers of ground mining wells are determined according to the positions and the lengths of return air tunnels of coal mine mining working faces; adopting a drill hole to be 10 meters below bedrock, and putting a surface casing for well cementation, wherein cement is raised to the ground; secondly, drilling to a certain position on the upper part of the working surface of the main coal mining seam, putting a technical casing, completing secondary well cementation, raising cement to the ground, and curing the well; and respectively drilling holes at the final hole position parallel to two sides of the return airway, and forming drilling tool combination drilling by using a single drill rod and a flexible short section, wherein the drilling direction is parallel to the return airway. The gas at the upper corners of the underground goaf and the mining area can be effectively reduced, the safe production of a coal mine can be ensured, the production connection capacity of the coal mine is improved, and the productivity of the coal mine is released.
Description
Technical Field
The invention belongs to the technical field of underground gas control in coal mining, and particularly relates to a coal and coal bed gas co-mining technology.
Background
China has abundant coal resources, coal serving as a first energy source is stable and unchangeable for a long time, but coal mining in China is limited by the problem of gas outburst for a long time, so that the problems of mine productivity, production linkage and underground safety are always puzzled to coal mining production.
The goaf and the gas in the mining area formed in the stoping process of the original ground drilling vertical well pumping working face are a low-cost construction process, but because the number of construction wells is large, the method is severely restricted by the complex ground topography condition and the ground equipped pumping equipment.
Disclosure of Invention
The invention provides a method for extracting gas in a coal mine mining area, aiming at the problems that the number of existing ground drilling and straight well extraction construction wells is large, the existing ground drilling and straight well extraction construction wells are limited by complex ground topography conditions, and the number of ground matched extraction equipment is large.
The invention adopts the following technical scheme:
a coal mine mining area gas extraction method comprises the following steps:
firstly, determining the position and the hole number of a ground mining well according to the position and the length of a return airway of a coal mining working face;
secondly, the position of a well mouth is positioned between the return airway and the air intake airway, is close to one side of the return airway and is 10m away from the return airway, and the distance between every two well mouth drill holes is 400 m;
thirdly, adopting a first drilled hole to reach 10m below bedrock, and putting a surface casing for well cementation, wherein cement is raised to the ground;
fourthly, drilling the secondary coal face to the upper part of the main coal face, putting a technical casing pipe in the secondary coal face to finish secondary well cementing, and cement returns to the ground to be cemented;
and fifthly, respectively drilling holes in the position of the final hole, which is parallel to the two sides of the return airway, and forming a drilling tool combination by using a single drill rod and a flexible short section to drill, wherein the drilling direction is parallel to the direction of the return airway.
The invention has the following beneficial effects:
according to the invention, civil engineering such as ground well sites and roads and the like are greatly reduced, equipment and power supply installation engineering in later-stage extraction are reduced, the investment of coal and coalbed methane co-extraction capital is reduced, the working strength of field personnel is reduced, the coal mine capacity is released, and the gas concentration in a goaf and a mining area of an underground working face is reduced.
The invention achieves the following effects:
1. capital investment: compared with the prior art, the investment of well sites, roads, drilling, equipment installation, circuits, gathering and transportation and the like of 8 mining empty wells can be saved by only constructing one ground mining empty well.
2. Field management: the reduction of the number of wells directly reduces the working intensity of field personnel, and the field management is more targeted.
3. Coal mine safety: the method can effectively extract the gas in the goaf and the mining area of the coal mine excavation working face in time, can effectively improve the coal mine productivity, can improve the coal mine production linking capacity, and can improve the coal mine safety production coefficient.
Drawings
FIG. 1 is a schematic diagram of a wellbore configuration of the present invention;
FIG. 2 is a schematic diagram of a well location arrangement according to the present invention.
Detailed Description
A coal mine mining area gas extraction method comprises the following steps:
firstly, determining the position and the hole number of a ground mining well according to the position and the length of a return airway of a coal mining working face;
secondly, the position of a well mouth is positioned between the return airway and the air intake airway, is close to one side of the return airway and is 10m away from the return airway, and the distance between every two well mouth drill holes is 400 m;
thirdly, adopting a first drilled hole to reach 10m below bedrock, and putting a surface casing for well cementation, wherein cement is raised to the ground;
fourthly, secondary-opening drilling is carried out to the upper part of the main coal face (the specific position determines the specific final hole position according to the mining pressure relief height of the mine), a technical sleeve is put in to complete secondary-opening well cementation, cement is raised to the ground, and the cement is cured;
and fifthly, respectively drilling holes in the position of the final hole, which is parallel to the two sides of the return airway, and forming a drilling tool combination by using a single drill rod and a flexible short section to drill, wherein the drilling direction is parallel to the direction of the return airway.
Claims (1)
1. A coal mine mining area gas extraction method is characterized by comprising the following steps: the method comprises the following steps:
firstly, determining the position and the hole number of a ground mining well according to the position and the length of a return airway of a coal mining working face;
secondly, the position of a well mouth is positioned between the return airway and the air intake airway, is close to one side of the return airway and is 10m away from the return airway, and the distance between every two well mouth drill holes is 400 m;
thirdly, adopting a first drilled hole to reach 10m below bedrock, and putting a surface casing for well cementation, wherein cement is raised to the ground;
fourthly, drilling the secondary coal face to the upper part of the main coal face, putting a technical casing pipe in the secondary coal face to finish secondary well cementing, and cement returns to the ground to be cemented;
and fifthly, respectively drilling holes in the position of the final hole, which is parallel to the two sides of the return airway, and forming a drilling tool combination by using a single drill rod and a flexible short section to drill, wherein the drilling direction is parallel to the direction of the return airway.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010746378.1A CN111927399A (en) | 2020-07-29 | 2020-07-29 | Coal mine mining area gas extraction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010746378.1A CN111927399A (en) | 2020-07-29 | 2020-07-29 | Coal mine mining area gas extraction method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111927399A true CN111927399A (en) | 2020-11-13 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010746378.1A Pending CN111927399A (en) | 2020-07-29 | 2020-07-29 | Coal mine mining area gas extraction method |
Country Status (1)
| Country | Link |
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| CN (1) | CN111927399A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104481579A (en) * | 2014-12-16 | 2015-04-01 | 中煤科工集团重庆研究院有限公司 | Construction method of ground L-shaped roof horizontal well in mining area |
| CN105134286A (en) * | 2015-10-13 | 2015-12-09 | 山西晋煤集团技术研究院有限责任公司 | Method for extracting gas of gob of L-shaped well |
| CN105840146A (en) * | 2016-04-14 | 2016-08-10 | 中国石油大学(华东) | Method for self-circulation exploitation of geothermal energy of hot dry rock with multilateral well and volume fracturing technologies |
| WO2016204806A1 (en) * | 2015-06-15 | 2016-12-22 | Halliburton Energy Services, Inc. | Igniting underground energy sources using a propellant torch |
| CN106948860A (en) * | 2017-05-27 | 2017-07-14 | 中煤科工集团重庆研究院有限公司 | Method for extracting coal seam gas based on cooperation of U-shaped well and directional drilling |
| CN108643960A (en) * | 2018-05-21 | 2018-10-12 | 河南工程学院 | A kind of ground region band coal mine gas extinction technique |
| CN109322697A (en) * | 2018-12-12 | 2019-02-12 | 中煤科工集团重庆研究院有限公司 | Method for treating gas on high-gas coal face by using well instead of roadway |
-
2020
- 2020-07-29 CN CN202010746378.1A patent/CN111927399A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104481579A (en) * | 2014-12-16 | 2015-04-01 | 中煤科工集团重庆研究院有限公司 | Construction method of ground L-shaped roof horizontal well in mining area |
| WO2016204806A1 (en) * | 2015-06-15 | 2016-12-22 | Halliburton Energy Services, Inc. | Igniting underground energy sources using a propellant torch |
| CN105134286A (en) * | 2015-10-13 | 2015-12-09 | 山西晋煤集团技术研究院有限责任公司 | Method for extracting gas of gob of L-shaped well |
| CN105840146A (en) * | 2016-04-14 | 2016-08-10 | 中国石油大学(华东) | Method for self-circulation exploitation of geothermal energy of hot dry rock with multilateral well and volume fracturing technologies |
| CN106948860A (en) * | 2017-05-27 | 2017-07-14 | 中煤科工集团重庆研究院有限公司 | Method for extracting coal seam gas based on cooperation of U-shaped well and directional drilling |
| CN108643960A (en) * | 2018-05-21 | 2018-10-12 | 河南工程学院 | A kind of ground region band coal mine gas extinction technique |
| CN109322697A (en) * | 2018-12-12 | 2019-02-12 | 中煤科工集团重庆研究院有限公司 | Method for treating gas on high-gas coal face by using well instead of roadway |
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20201113 |
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| RJ01 | Rejection of invention patent application after publication |