CN103075179B - Entitative coal seam gas drainage drilling hole double-pipe drainage method - Google Patents

Entitative coal seam gas drainage drilling hole double-pipe drainage method Download PDF

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Publication number
CN103075179B
CN103075179B CN201210542199.1A CN201210542199A CN103075179B CN 103075179 B CN103075179 B CN 103075179B CN 201210542199 A CN201210542199 A CN 201210542199A CN 103075179 B CN103075179 B CN 103075179B
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CN
China
Prior art keywords
polyurethane
pipe
flexible sleeve
hole sealing
sealing bag
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CN201210542199.1A
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Chinese (zh)
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CN103075179A (en
Inventor
林柏泉
李贺
高亚斌
杨威
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中国矿业大学
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Publication of CN103075179A publication Critical patent/CN103075179A/en
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Abstract

The invention provides an entitative coal seam gas drainage drilling hole double-pipe drainage method, which is particularly applicable to a coal mine underground entitative coal seam long-distance and large-aperture gas drainage drilling hole. A gas drainage pipe is sent into the drainage drilling hole to the hole bottom, a flexible sleeve pipe with the diameter being twice the diameter of the gas drainage pipe is sheathed at the back part of the gas drainage pipe, a 3-4m pattern hole is formed at the front end of the flexible sleeve pipe, a first polyurethane double-material hole sealing bag and a second polyurethane double-material hole sealing bag are respectively and fixedly arranged in positions with distances being 4 to 5m and 22 to 23m from the front end of the flexible sleeve pipe by adhesive tapes, and the flexible sleeve pipe is sent into the drainage drilling hole after the hole sealing bags are extruded so that the second polyurethane double-material hole sealing bag is 2 to 3m away from the hole opening of the drilling hole; after the polyurethane is cured, cement mortar is filled between the two polyurethane hole sealing sections; and after the cement mortar is cured, the flexible sleeve pipe is connected into a gas drainage net for gas drainage. The method has the advantages that the structure is simple, the operation is convenient, and the problem of gas drainage flow rate reduction can be effectively solved.

Description

This coal bed gas extraction two-tube pumping method of holing

Technical field

The present invention relates to a kind of the coal bed gas extraction two-tube pumping method of holing, be particularly useful for the long distance in this coal seam, large aperture mash gas pumping drilling under coal mine.

Background technology

China's coal and Gas Outburst disaster are serious, to safety in production under coal mine, bring threat.This coal bed gas extraction is one of effective means of eliminating gas danger, guarantee gas utilization.For increasing gas pumping space, realize the efficient extraction of gas, the long distance of construction, large-diameter borehole in this coal seam of being everlasting.Yet along with the increase of mining depth, geostatic stress and gas pressure constantly increase, can there is gross distortion, cave in large-diameter borehole, at area of stress concentration, even there will be broken coal to stop up the situation of drainage tube presbyopia on a large scale under Radial Loads.If gas pumping length of tube is shorter, fail to deliver to extraction borehole bottom, at boring inner segment, there will be partial collapse, gas pumping resistance increases, and gas pumping space reduces, and effective extraction length that causes holing reduces, and extraction flow reduces.After roadway construction, apart from wall 10 ~ 20m position, there will be stress to concentrate, if do not take any measure in this section boring, thereby broken coal can slowly enter drainage tube presbyopia, stopping up drainage tube.Constructing at the scene, gas extraction flow is low, the phenomenon such as fast that declines by often there will be for this drainage from coal seam boring, and the extraction borehole life-span is low, is difficult to effectively extract out this coal-bed gas, has greatly restricted the development that coal and gas are adopted technology altogether.

Summary of the invention

Technical problem: the object of the invention is to overcome the deficiency in prior art, provide a kind of simple, can effectively solve this coal bed gas extraction that gas extraction flow that boring collapse hole causes reduces two-tube pumping method of holing.

Technical scheme: of the present invention the coal bed gas extraction two-tube pumping method of holing:

At the bottom of a, this coal bed gas extraction completing in construction are sent into gas pumping Guan Zhikong in holing, at the rear portion of gas pumping pipe suit flexible sleeve, flexible sleeve front end has 3 ~ 4m presbyopia, and gas pumping pipe whole tube section evenly has presbyopia;

B, apart from the fixing extra quality hole sealing bag one of polyurethane of adhesive tape for flexible sleeve front end 4 ~ 5m position, the extra quality hole sealing bag one of extruding polyurethane, the fixing flexible boot pipeline section of the extra quality hole sealing bag one of polyurethane is sent in extraction borehole, apart from the fixing extra quality hole sealing bag two of polyurethane of adhesive tape for flexible sleeve front end 22 ~ 23m position, fixedly Grouting Pipe and return pipe simultaneously, the extra quality hole sealing bag two of extruding polyurethane, again the fixing flexible boot pipeline section of the extra quality hole sealing bag two of polyurethane is sent in extraction borehole, made the extra quality hole sealing bag two of polyurethane apart from drilling orifice 2 ~ 3m;

C, after extra quality the mixing of polyurethane in the extra quality hole sealing bag of polyurethane, by Grouting Pipe to injected water cement mortar between the extra quality hole sealing bag one of polyurethane and the extra quality hole sealing bag two of polyurethane, until after return pipe overfall, stop slip casting;

D, after cement mortar is solidified, flexible sleeve is accessed to gas pumping pipe network and carries out gas pumping.

The diameter of described flexible sleeve is the twice of gas pumping pipe diameter.

Beneficial effect: the present invention is directed to this coal bed gas extraction easy collapse hole of holing; gas extraction flow is little, decline is fast; the problems such as the boring life-span is low; by the gas pumping pipe of sending at the bottom of hole, support hole pumping and mining space; make gas pumping cover boring omnidistance; even if occurring localized borehole caves in; gas also can outwards discharge by the drainage tube presbyopia of collapse hole section not; by flexible sleeve, protect drilling hole stress concentration zones; between drill hole wall and gas pumping pipe, form " isolation strip ", avoid broken coal to stop up gas pumping pipe presbyopia.The diameter of flexible sleeve is the twice of gas pumping pipe diameter, between flexible sleeve and gas pumping pipe, form an annular space, the sectional area of this annular space is 2 ~ 3 times that gas pumping tube section amasss, greatly increased gas pumping space, dredge gas migration passage, promoted gas extraction flow.The method is simple, easy to operate, has practicality widely.

Accompanying drawing explanation

Fig. 1 is of the present invention the coal bed gas extraction two-tube pumping method schematic diagram of holing.

In figure: 1-mash gas pumping drilling, 2-coal body, 3-gas pumping pipe, 4-flexible sleeve, 5-flexible sleeve ball valve, the extra quality hole sealing bag one of 6-polyurethane, the extra quality hole sealing bag two of 7-polyurethane, 8-cement mortar, 9-Grouting Pipe, 10-Grouting Pipe ball valve, 11-return pipe, 12-return pipe ball valve.

The specific embodiment

Below in conjunction with the embodiment in accompanying drawing, the invention will be further described:

As shown in Figure 1, of the present invention the coal bed gas extraction two-tube pumping method of holing: first in this coal seam drill site to coal body 2 mash gas pumping drilling 1 of constructing routinely, the hole depth of mash gas pumping drilling 1 and aperture are definite according to on-site actual situations, and if hole depth is 70m, aperture is 113mm; After this coal bed gas extraction boring 1 construction, utilize and press drilling cuttings in wind clear opening; Gas pumping pipe 3 whole tube sections are evenly offered to presbyopia, by inserting mode, connect and deliver to extraction borehole 1 bottom, at gas pumping pipe 3 rear portion suit flexible sleeves 4, the diameter of flexible sleeve 4 is the twice of gas pumping pipe 3 diameters, and the front end of flexible sleeve 4 has 3 ~ 4m presbyopia; Apart from the fixing extra quality hole sealing bag 1 of polyurethane of adhesive tape for flexible sleeve 4 front end 4 ~ 5m positions, extruding polyurethane extra quality hole sealing bag 1 mixes the polyurethane black and white material in bag, and 4 sections of flexible sleeves that are fixed with the extra quality hole sealing bag 1 of polyurethane are sent in extraction borehole 1; Apart from the fixing extra quality hole sealing bag 27 of polyurethane of adhesive tape for flexible sleeve 4 front end 22 ~ 23m positions, the fixing relative position of Grouting Pipe 9 and return pipe 11 simultaneously, Grouting Pipe 9 is close to boring lower wall, return pipe 11 is close to boring upper wall, the extra quality hole sealing bag 27 of extruding polyurethane mixes the polyurethane black and white material in bag, again 4 sections of the flexible sleeves of the fixing extra quality hole sealing bag 27 of polyurethane are sent in extraction borehole 1, made the extra quality hole sealing bag 27 of polyurethane apart from drilling orifice 2 ~ 3m; After extra quality the solidifying of polyurethane in the extra quality hole sealing bag of polyurethane, Grouting Pipe 9 is connected to grouting pump, open Grouting Pipe ball valve 10, open grouting pump, by Grouting Pipe 9 to injected water cement mortar 8 between the extra quality hole sealing bag 1 of polyurethane and the extra quality hole sealing bag 27 of polyurethane, until after return pipe 11 overfalls, close grouting pump, close Grouting Pipe ball valve 10, return pipe ball valve 12, stop slip casting; After cement mortar 8 is solidified, by flexible sleeve 4 access gas pumping pipe networks, open flexible sleeve ball valve 5 and carry out gas pumping.

Claims (1)

1. this coal bed gas extraction two-tube pumping method of holing, is characterized in that:
In a, this coal bed gas extraction boring (1) that completes in construction, send into gas pumping pipe (3) at the bottom of hole, at the rear portion of gas pumping pipe (3) suit flexible sleeve (4), flexible sleeve (4) front end has 3 ~ 4m presbyopia, gas pumping pipe (3) whole tube section evenly has presbyopia, by inserting mode, connect and deliver to extraction borehole (1) bottom, the diameter of described flexible sleeve (4) is the twice of gas pumping pipe (3) diameter;
B, apart from the fixing extra quality hole sealing bag one (6) of polyurethane of adhesive tape for flexible sleeve (4) front end 4 ~ 5m place, the extra quality hole sealing bag one (6) of extruding polyurethane mixes the polyurethane black and white material in bag, flexible sleeve (4) section of the fixing extra quality hole sealing bag one (6) of polyurethane is sent in extraction borehole (1), apart from the fixing extra quality hole sealing bag two (7) of polyurethane of adhesive tape for flexible sleeve (4) front end 22 ~ 23m place, the fixing relative position of Grouting Pipe (9) and return pipe (11) simultaneously, Grouting Pipe (9) is close to boring lower wall, return pipe (11) is close to boring upper wall, the extra quality hole sealing bag two (7) of extruding polyurethane mixes the polyurethane black and white material in bag, again flexible sleeve (4) section of the fixing extra quality hole sealing bag two (7) of polyurethane is sent in extraction borehole (1), make the extra quality hole sealing bag two (7) of polyurethane apart from drilling orifice 2 ~ 3m,
C, after extra quality the mixing of polyurethane in the extra quality hole sealing bag of polyurethane, Grouting Pipe (9) is connected to grouting pump, open Grouting Pipe ball valve (10), open grouting pump, by Grouting Pipe (9) to injected water cement mortar (8) between the extra quality hole sealing bag one (6) of polyurethane and the extra quality hole sealing bag two (7) of polyurethane, until after return pipe (11) overfall, stop slip casting;
D, after cement mortar (8) is solidified, by flexible sleeve (4) access gas pumping pipe network, open flexible sleeve ball valve (5) and carry out gas pumping.
CN201210542199.1A 2012-12-14 2012-12-14 Entitative coal seam gas drainage drilling hole double-pipe drainage method CN103075179B (en)

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CN103266913B (en) * 2013-05-13 2016-08-03 西南石油大学 A kind of gas pumping method
CN104165029B (en) * 2013-05-20 2016-10-05 河南理工大学 The gas pumping method of underground coal mine total length boring
CN103470212B (en) * 2013-07-15 2016-02-24 中国矿业大学 A kind of active drilling and sealing device and method
CN103742115B (en) * 2013-12-18 2016-03-23 中国矿业大学 A kind of coal mine underground fracturing sealing device and method
CN104389587A (en) * 2014-10-11 2015-03-04 安徽建筑大学 Quick measurement method of coal seam gas pressure
CN104612640B (en) * 2015-01-12 2017-08-29 中国矿业大学 A kind of coal mine down-hole drilling heat injection and sealing of hole integral method
CN105089548A (en) * 2015-08-11 2015-11-25 重庆市能源投资集团科技有限责任公司 Nearly horizontal high pressure-bearing drilling sealing method and sealing structure
CN105696967A (en) * 2016-01-21 2016-06-22 淮南久辉工贸有限责任公司 Mining hole packer and hole packing method
CN106761725A (en) * 2016-12-14 2017-05-31 中国矿业大学 A kind of method that the tunnel reasonable hole sealing depth of concordant mash gas pumping drilling is determined based on coal powder quantity of bore
CN106884624A (en) * 2017-03-29 2017-06-23 淮南矿业(集团)有限责任公司 A kind of area of stress concentration crushed zone drilling and sealing device and method for sealing
CN109838274A (en) * 2019-01-25 2019-06-04 华北科技学院 The suitable seam inclination drilling gas controlling device and method taken out after note before a kind of
CN110344758B (en) * 2019-08-05 2020-08-25 湖南科技大学 Construction method for gas extraction drill hole of high-gas extremely-soft coal seam

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