CN101915085B - Low-air-permeability coal-bed gas extraction method - Google Patents

Low-air-permeability coal-bed gas extraction method Download PDF

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Publication number
CN101915085B
CN101915085B CN2010102521698A CN201010252169A CN101915085B CN 101915085 B CN101915085 B CN 101915085B CN 2010102521698 A CN2010102521698 A CN 2010102521698A CN 201010252169 A CN201010252169 A CN 201010252169A CN 101915085 B CN101915085 B CN 101915085B
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coal
influence area
pressure break
drilling
low
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CN101915085A (en
Inventor
张海军
李海贵
王德璋
付峻青
申晋伟
刘毅
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Shanxi Lanyan Coalbed Methane Group Co., Ltd.
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Shanxi Jincheng Anthracite Mining Group Co Ltd
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Abstract

The invention relates to a coal-mine gas extraction technology, in particular to a low-air-permeability coal-bed gas extraction method, which solves the problem of low extraction and drainage efficiency caused by poor coal-bed air permeability under a traditional coal mine. In the low-air-permeability coal-bed gas extraction method, the coal-bed gas of a ground well fracturing influence area is extracted by penetrating an underground construction directional drilling hole through the ground well fracturing influence area of a ground bored well. In the method, the gas extraction and drainage quantity within unit time can be greatly increased by penetrating the drilling hole through the ground well fracturing influence area and utilizing the advantage of high coal-bed air permeability in the ground well fracturing influence area.

Description

Low-air-permeability coal-bed gas extraction method
Technical field
The present invention relates to a kind of coal mine gas extraction technology, be specially a kind of low-air-permeability coal-bed gas extraction method.
Background technology
The down-hole drilling extraction is one of control of coalmine gas major measure outstanding with eliminating coal and gas, reduces coal seam gas-bearing capacity by extraction, the danger that the gas emission when reducing the mine back production is outstanding with reducing coal and gas.But for the relatively poor coal seam of gas permeability, directly carry out hole pumping and mining in the down-hole, effect is relatively poor.At present the method that improves gas permeability of coal seam can use ground drilling, pressure break then, and the strong crack district of formation certain distance is the pressure break influence area in coal seam around the boring, thereby has improved gas permeability.
Summary of the invention
The present invention provides a kind of low-air-permeability coal-bed gas extraction method in order to solve under the existing coal mine owing to the gas permeability of coal seam difference causes the low problem of drainage efficient.
The present invention is realized by following technical scheme, and a kind of low-air-permeability coal-bed gas extraction method in the surface well pressure break influence area of down-hole construction directional drilling penetrated surface drilling well, carries out extraction to surface well pressure break influence area coal-bed gas.
Specifically can adopt the directional drilling down of well-digging earlier, and then the construction ground drilling, make the surface well pressure break influence area of ground drilling cover one or more directional drilling.Perhaps first construction ground drilling, pressure break forms surface well pressure break influence area, and the hole of drilling, down-hole penetrates this influence area then.
Method of the present invention is utilized the high advantage of gas permeability of coal seam in the surface well pressure break influence area by boring being passed surface well pressure break influence area, can increase substantially the gas drainage under suction amount of unit interval.
Description of drawings
Fig. 1 is the layout schematic diagram of the described method of invention
Fig. 2 is the A-A sectional drawing of Fig. 1
Among the figure: 1-is unminded district, 2-tunnel, 3-directional drilling, 4-surface well pressure break influence area, 5-ground drilling, 6-will mining area
The specific embodiment
As schematically shown in Figure 1, a kind of low-air-permeability coal-bed gas extraction method in the surface well pressure break influence area 4 of down-hole construction directional drilling 3 penetrated surface drilling wells 5, and then carries out extraction to surface well pressure break influence area 4 coal-bed gas.
Specifically can adopt the directional drilling 3 down of well-digging earlier, and then construction ground drilling 5, make the surface well pressure break influence area 4 of ground drilling cover one or more directional drilling 3.Perhaps elder generation's construction ground drilling 5 utilizes ground fracturing unit pressure break to form surface well pressure break influence area 4, and the down-hole is beaten directional drilling 3 and penetrated this influence area then.
Directional drilling 3 has at least one, passes surface well pressure break influence area 4 jointly.As schematically shown in Figure 2, in the surface well pressure break influence area 4 of ground drilling 5, described surface well pressure break influence area 4 width can reach 50-100 rice, height 5-6 rice, so implementing bore arrangement mode on wall can two rows, pitch of holes with row can be controlled at 5-10 rice, and pitch of holes is between 1.5-2 rice up and down.So, in surface well pressure break influence area 4, can pass tens of borings, improved the extraction effect of gas in the pressure break district greatly, the time that ton coal gas bearing capacity is reduced to the safety in production required standard in the coal seam shortens greatly, coal production to the colliery is very favourable, has improved the unit interval pumping volume of gas simultaneously.

Claims (1)

1. low-air-permeability coal-bed gas extraction method, it is characterized in that surface well pressure break influence area (4) in down-hole construction directional drilling (3) penetrated surface drilling well (5), and then surface well pressure break influence area (4) coal-bed gas carried out extraction, directional drilling (3) has at least one, pass surface well pressure break influence area (4) jointly, elder generation's construction ground drilling (5), pressure break forms surface well pressure break influence area (4), beats directional drilling (3) then in the down-hole and penetrates this influence area; Perhaps directional drilling (3) under the well-digging earlier, and then construction ground drilling (5) makes the surface well pressure break influence area (4) of ground drilling cover one or more directional drilling (3).
CN2010102521698A 2010-08-13 2010-08-13 Low-air-permeability coal-bed gas extraction method Active CN101915085B (en)

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Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102226412B (en) * 2011-05-24 2013-06-05 中国矿业大学 Underground dark mining drilling well gas extraction method
CN102226413B (en) * 2011-05-24 2013-10-30 中国矿业大学 Gas extraction method of cross hole drilling area of gas discharge laneway
CN102493831B (en) * 2011-11-14 2014-05-28 山西晋城无烟煤矿业集团有限责任公司 Method for extracting coal seam gas through ground fracturing and underground horizontal drill holes
CN102635392B (en) * 2012-05-04 2014-12-10 中国矿业大学 Co-extraction method for pillar-less coal and gas of advanced entry-retaining construction extraction engineering
CN102704905A (en) * 2012-06-11 2012-10-03 煤炭科学研究总院沈阳研究院 Segmental hydraulic fracturing coal seam pressure releasing device and method
CN105089493B (en) * 2014-05-13 2018-10-23 郑州大学 Ground vertical well combines pressure released seam gas pumping method with underground layer-through drilling
CN104265354B (en) * 2014-08-07 2016-04-20 中国矿业大学 A kind of low air permeability coal seam waterpower phase transformation fracturing strengthening gas pumping method
CN109403926A (en) * 2018-10-31 2019-03-01 中国神华能源股份有限公司 Implement the method for the coal bed gas of underground mining multilayer coal in a main entry
NL2028339B1 (en) 2021-05-31 2022-06-24 North China Inst Science & Tech An high-efficient gas drainage method for low-permeability coal seam
CN115450599B (en) * 2022-09-14 2023-07-14 中国地质大学（武汉） Method for determining fracturing target point spacing of ground well for outburst prevention of coal seam

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Assignee: Shanxi Lanyan Coalbed Methane Group Co., Ltd.

Assignor: Shanxi Jincheng Anthracite Mining Industry Group Co., Ltd.

Contract record no.: 2012990000180

Denomination of invention: Low-air-permeability coal-bed gas extraction method

Granted publication date: 20110928

License type: Exclusive License

Open date: 20101215

Record date: 20120401

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Effective date of registration: 20161011

Address after: Lee Village town 048204 Shanxi city of Jincheng province Qinshui County Scarlett

Patentee after: Shanxi Lanyan Coalbed Methane Group Co., Ltd.

Address before: 048006, Shanxi City, Jincheng Province North Stone Shop Shanxi Coal Group

Patentee before: Shanxi Jincheng Anthracite Mining Industry Group Co., Ltd.