CN101915086B - Coal mine underground gas borehole fracturing method - Google Patents

Coal mine underground gas borehole fracturing method Download PDF

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Publication number
CN101915086B
CN101915086B CN2010102521787A CN201010252178A CN101915086B CN 101915086 B CN101915086 B CN 101915086B CN 2010102521787 A CN2010102521787 A CN 2010102521787A CN 201010252178 A CN201010252178 A CN 201010252178A CN 101915086 B CN101915086 B CN 101915086B
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China
Prior art keywords
coal mine
coal
gas
drilled holes
borehole
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CN2010102521787A
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CN101915086A (en
Inventor
付峻青
张海军
李海贵
王德璋
胡包生
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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 method, in particular to a coal mine underground gas borehole fracturing method being suitable for a high-gas coal bed. The invention solves the problems of coal mine fissure ratio nondevelopment and low extraction efficiency of extracted gas underground in the existing coal mine. A well is drilled on the construction ground above a laneway, pipes are arranged in the drilled well, and pipelines are auxiliarily arranged in the laneway; a long borehole of the coal mine is arranged in the laneway, the pipelines are connected with the long borehole, the borehole is effectively sealed, and at the time, the long borehole and the ground drilled well are communicated by the pipelines; and then the coal bed at a long borehole construction area is fractured by utilizing ground drilled well fracturing equipment so as increase the air permeability of the coal bed. The extraction efficiency of the coal bed underground can be improved.

Description

The method of coal mine underground gas borehole fracturing
Technical field
The present invention relates to a kind of coal mine gas pumping method, be specially a kind of method that is applicable to the coal mine underground gas borehole fracturing of high gas layer.
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.The mode of ground extraction is, in the ground construction drilling well, and pressure break is carried out in the coal seam, in the coal seam, form the pressure break influence area by well casing, natural pressure release or re-injection water by gas discharges gas then, thereby reaches the effect of gas in the extraction coal seam.This technology comes from oil recovery technique, at present the comparative maturity of operation.But present coal mining geology structure more complicated, the direct extraction in ground can not reach the effect of thorough mash gas extraction fully.Under many circumstances, the method that also will lean against the extraction of directly holing in the underworkings is come gas-removing, finds that in practice for the obsolete coal seam of crack degree, directly carry out hole pumping and mining in the down-hole, speed that gas discharges naturally and output effect are all poor.
Summary of the invention
The present invention provides a kind of method of coal mine underground gas borehole fracturing in order to solve mash gas extraction exists under the existing coal mine cracks in coal seam degree agensis, the inefficient problem of extraction.
The present invention is realized by following technical scheme, a kind of method of coal mine underground gas borehole fracturing, and the ground drilling of constructing above the tunnel in the drilling well inner lower tube, and is assisted in the tunnel and is established pipeline; This coal seam long drilled holes of construction in underworkings, pipeline is connected with boring, and carries out effective sealing of hole, boring this moment and ground drilling pipeline UNICOM in the junction, utilize the ground drilling fracturing unit that pressure break is carried out in the coal seam of the long drilled holes construction area in this coal seam then, increase gas permeability of coal seam.
Compared with prior art, advantage of the present invention is, can be according to the trend and the layout of underworkings, select the position of ground well-digging neatly, utilizing ground pressure break equipment with technology the large tracts of land pressure break to be carried out in this drainage from coal seam zone under the coal mine increases crack degree and gas permeability, can improve down-hole this drainage from coal seam efficient.
Description of drawings
Fig. 1 is the schematic diagram that utilizes ground fracturing unit pressure break down-hole drilling of the present invention
Fig. 2 is the vertical view that the scene of the method for the invention is arranged
Among the figure: 1-long drilled holes, 2-tunnel, 3-connecting pipe, the standby back production of 4-district, 5-ground drilling, 6-pressure break pipeline, 7-ground fracturing unit, 8-pipe connections
The specific embodiment
A kind of method of coal mine underground gas borehole fracturing, the ground drilling of constructing above the tunnel in the drilling well inner lower tube, and is assisted in the tunnel and is established pipeline; The down-hole utilizes km rig this coal seam long drilled holes of constructing in the tunnel, pipeline is connected with long drilled holes, and carry out effective sealing of hole in the junction, this moment long drilled holes and ground drilling pipeline UNICOM, utilize the ground drilling fracturing unit that pressure break is carried out in the coal seam of the long drilled holes construction area in this coal seam then, increase gas permeability of coal seam.
As shown in Figure 1, 2, by position finding, the ground construction ground drilling 5 above tunnel 2, following pressure break pipeline 6 in drilling well, and in tunnel 2, assist and establish connecting pipe 3.To the long drilled holes 1 in these coal seams of construction, standby back production district 4, and carry out effective sealing of hole in tunnel 2, it connects with ground fracturing unit 7 by the connecting pipe 3 in wellbore tubing 6 and the tunnel.Utilize ground fracturing unit 7 that pressure break is carried out in the coal seam in standby back production district 4 after the connection, increase gas permeability of coal seam.Then this coal bed drilling of down-hole is inserted down-hole original gas pumping system, connect by the underground gas extraction system and take out.
Long drilled holes 1 can be many, and be arranged in the tunnel about two help, utilize 5 pairs of many long drilled holes 1 of single ground drilling to implement pressure break one by one.Both save the quantity of ground drilling, also improved the efficient of pressure break simultaneously.
Can also above the tunnel, implement ground drilling targetedly according to the trends of design and the layout of underworkings, when treating that the drilling well below is got in the tunnel, just can utilize this ground drilling to implement this method immediately.

Claims (2)

1. the method for a coal mine underground gas borehole fracturing is characterized in that, (2) top construction ground drilling (5) in the tunnel in drilling well inner lower tube (6), and is assisted in tunnel (2) and established pipeline (3), and described pipeline (3) is communicated with pipe (6); This coal seam long drilled holes (1) of construction in underworkings, pipeline (3) is connected with long drilled holes (1), the junction effectively seals, pipeline (3) UNICOM that long drilled holes this moment (1) and ground drilling are used, utilize ground drilling fracturing unit (7) that pressure break is carried out in the coal seam of the long drilled holes construction area in this coal seam then, increase gas permeability of coal seam.
2. the method for coal mine underground gas borehole fracturing according to claim 1 is characterized in that, long drilled holes (1) is many, and be arranged in the tunnel about two help, single ground drilling (5) is implemented pressure break one by one to many long drilled holes (1).
CN2010102521787A 2010-08-13 2010-08-13 Coal mine underground gas borehole fracturing method Active CN101915086B (en)

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Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
CN2010102521787A CN101915086B (en) 2010-08-13 2010-08-13 Coal mine underground gas borehole fracturing method

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CN101915086B true CN101915086B (en) 2011-06-22

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Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102080526B (en) * 2011-01-17 2012-08-22 河南理工大学 Method for extracting gas from bedding level fractured well of ground coal seam roof
CN102383830B (en) * 2011-09-30 2014-12-24 中煤科工集团重庆研究院有限公司 Comprehensive outburst prevention method for outburst coal seam region
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
CN102587959B (en) * 2012-03-13 2014-08-20 华晋煤层气综合利用有限责任公司 Method for draining coal seam gas
CN105201480B (en) * 2015-10-14 2017-09-26 山西晋煤集团技术研究院有限责任公司 Surface well underground long drilled holes pressure break coal seam method
CN108661697A (en) * 2018-05-31 2018-10-16 中煤科工集团西安研究院有限公司 Long drilled holes gas enhanced gas extraction method under the service well of ground
CN109653787A (en) * 2019-01-25 2019-04-19 安徽理工大学 A kind of high artesian high gas layer group coordination pumping and mining pressure relief method
CN110965964B (en) * 2019-12-16 2021-10-12 临沂矿业集团菏泽煤电有限公司 Gas extraction method for ultra-thick coal seam

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4687060A (en) * 1986-06-13 1987-08-18 Methane Drainage Ventures Production and grout liner for methane drainage in subterranean boreholes and method
US4836611A (en) * 1988-05-09 1989-06-06 Consolidation Coal Company Method and apparatus for drilling and separating
CN100356037C (en) * 2003-03-28 2007-12-19 淮南矿业(集团)有限责任公司 Low premeability high gas soft thick coal layer remote pressure relief gas exhausting method
CN101240715A (en) * 2008-01-24 2008-08-13 淮北矿业(集团)有限责任公司 One well three-purpose mash gas harnessing method for ground well drilling and ground well drilling
CN101403314B (en) * 2008-11-18 2011-03-23 河南理工大学 Coal mine down-hole drilling hydraulic fracturing anti-reflection mash gas extraction technique

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GR01 Patent grant
EE01 Entry into force of recordation of patent licensing contract

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

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

Contract record no.: 2012990000180

Denomination of invention: Coal mine underground gas borehole fracturing method

Granted publication date: 20110622

License type: Exclusive License

Open date: 20101215

Record date: 20120401

C41 Transfer of patent application or patent right or utility model
TR01 Transfer of patent right

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.