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 PDFInfo
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- 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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- polyurethane
- pipe
- flexible sleeve
- hole sealing
- sealing bag
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- 239000007789 gases Substances 0.000 title claims abstract description 68
- 239000003245 coal Substances 0.000 title claims abstract description 29
- OKTJSMMVPCPJKN-UHFFFAOYSA-N carbon Chemical compound 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Abstract
Description
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.
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