CN104863625A - Method for extracting gas from underground coal mine by adopting internal support pipe through drilling along coal seam - Google Patents
Method for extracting gas from underground coal mine by adopting internal support pipe through drilling along coal seam Download PDFInfo
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- CN104863625A CN104863625A CN201410059823.1A CN201410059823A CN104863625A CN 104863625 A CN104863625 A CN 104863625A CN 201410059823 A CN201410059823 A CN 201410059823A CN 104863625 A CN104863625 A CN 104863625A
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- hole
- sealing
- inner support
- coal
- extraction
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- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
Abstract
The invention discloses a method for extracting gas from an underground coal mine by adopting an internal support pipe through drilling along a coal seam, and provides a method for extracting coal seam gas through drilling along the coal seam by burying a polyvinyl chloride pipe adopting an internal support structure. According to the method, a hole for extracting gas along the seam is drilled in an underground coal seam of the coal mine along the tendency or trend of the coal seam, after the hole is drilled, coal dust in the drilled hole is blown off by compressed air, the internal support polyvinyl chloride pipe is lowered to a designed position, the hole is sealed, and the coal seam gas is extracted in a networking manner. The compressive strength of the internal support polyvinyl chloride pipe reaches 25 MPa, so that the designed section of the coal seam drilled hole is kept for 1 year, and a smooth channel is provided for gas flow and extraction; the technical problem that the drilled hole along the seam is difficult to protect due to loose coal seam and high stress can be solved, the effective service time of the drilled hole can be as long as 1 year, and the engineering requirement for gas extraction is met. The internal support pipe is simple in structure, easy to machine, simple and convenient to operate, high in compressive strength, low in cost and high in efficiency; the novel method can reduce the cost and improve the efficiency for extraction work of the underground coal mine gas.
Description
Technical field
The present invention relates to the method for a kind of underground coal mine along coal bed drilling inner support tube mash gas extraction.
Background technology
China's coal-mine underground gas extraction technology is widely used, and concordant can be divided into hole and layer-through drilling two kinds of extraction borehole arrangements according to boring and coal seam spatial relation.At present, the on-the-spot general gas pumping technological process of underground coal mine is: first construction is along coal seam or wear coal bed drilling, directly enter down the hollow polyvinyl chloride pipe of hard thin-wall in the borehole, the methods such as organic material, the direct shutoff of inorganic material or hole packer shutoff are adopted to carry out sealing of hole, mash gas extraction of then networking.Its basic characteristics support boring by polyvinyl chloride pipe self anti-pressure ability and boring self-stable ability, maintain boring basic configuration, for Gas Flow and extraction provide passage.
By geostatic stress effect, after coal bed drilling construction, around boring, defining stress concentrate circle, be subject to the effect of circle stress concentrated stress, hole wall shrinks, collapsing to arriving completely densified.After coal bed drilling construction grouting, along with the continuous shrinkage strain of surrounding medium, it acts on load on pipe laying wall and progressively raises, and pipe laying is deformed.Progressively development tube wall along with distortion cracks and occurs damage, and the stressed damage of pipe laying is the inevitable outcome of boring surrounding concentrated stress effect, finally causing pipe laying to be destroyed completely to causing by pressure break, even occurring the phenomenon be fully densified of holing.
Because coal seam non-deformability is lower, the tunnel arranged along coal seam mostly needs to adopt special supporting measure ability engineering demands, also has the stress characteristic identical with coal heading along coal bed drilling.Comparatively speaking, metal pipe material has advantages of higher compressive strength, and boring can be made to keep unimpeded for a long time, but a large amount of layout will produce unthinkable adverse effect to later stage mining work in coal seam.
At present, coal mine underground coal bed mash gas pumping drilling all adopts the method for the hollow polyvinyl chloride pipe pipe laying of hard thin-wall to carry out gas pumping, compressive strength 2.5MPa ~ the 6MPa of the hollow polyvinyl chloride pipe pipe laying of hard thin-wall, around boring under concentrated stress effect, pipe laying can be produced by pressure break very soon and destroy until boring is fully densified, enclose the passage of Gas Flow and extraction, make gas pumping work be difficult to carry out for a long time, seriously constrain carrying out smoothly of coal bed gas extraction work.Meet the requirement of gas pumping prescribed time-limit, necessary rationally raising pipe laying intensity or modified node method pattern are with the development speed of effective keyhole shrinkage strain.
Summary of the invention
In view of prior art Problems existing, the object of this invention is to provide a kind of coal seam feature request, with low cost, handling ease, underground coal mine easy to use of being suitable for along the method for coal bed drilling inner support polyvinyl chloride pipe pipe laying mash gas extraction.
The present invention has the polyvinyl chloride pipe of inner supporting structure according to People's Republic of China (PRC) coal industry standard MT 558.2-2005 " plastic pipe for coal mine material+part 2+polychloroethylene pipes " design processing, invent the method for a kind of underground coal mine along coal bed drilling inner support tube mash gas extraction: (1) holes, with the hydraulic drill rig of large torque (T >=2000KN) along seam inclination or move towards the boring of direction construction concordant, hole depth 60 ~ 85m:(2) aperture blowing, after Completion of Drilling Hole, with coal dust in pressure wind clear opening; (3) screen casing under, screen casing and common inner support tube connect lower at the bottom of hole section by section, and screen casing is that the small-bore Drilling operation boring respective numbers on common inner support tube tube wall forms; (4) upper pipe collar, pipe collar machining internal thread is connected with inner support tube; (5) connect interior stay tube section by section, common inner support tube external diameter and single-unit length can according to extraction main networking requirements processing in coal mine down-hole tunnel, general single-unit length 2 ~ 3m, and pipe two ends respectively process outer connecting thread; (6) sealing of hole, in hole under pipe after design attitude, employing micro-expansion cement mortar, polyurethane carry out sealing of hole, or adopt underground mine use sealing of hole utensil to carry out injection hole sealing with pressure, sealed borehole length 20 ~ 35m:(7) mash gas extraction of networking, after sealing of hole, treat sealing of hole slurry consolidation more than 24 hours, pressure testing checks that sealing quality reaches requirement and can to network mash gas extraction.
Result of use: the compressive strength of the polyvinyl chloride pipe of inner supporting structure reaches 25MPa, makes boring active time reach 1 year, can reduce material consumption, improve gas pumping efficiency.
method is implemented
the specific embodiment of the invention: (1) holes, with the hydraulic drill rig of large torque (T>=2000KN) along seam inclination or move towards the boring of direction construction concordant, hole depth 60 ~ 85m:(2) aperture blowing, after Completion of Drilling Hole, with coal dust in pressure wind clear opening; (3) screen casing under, screen casing and common inner support tube connect lower at the bottom of hole section by section, and screen casing is that the small-bore Drilling operation boring respective numbers on common inner support tube tube wall forms; (4) upper pipe collar, pipe collar machining internal thread is connected with inner support tube; (5) connect interior stay tube section by section, common inner support tube external diameter and single-unit length can according to extraction main networking requirements processing in coal mine down-hole tunnel, general single-unit length 2 ~ 3m, and pipe two ends respectively process outer connecting thread; (6) sealing of hole, in hole under pipe after design attitude, employing micro-expansion cement mortar, polyurethane carry out sealing of hole, or adopt underground mine use sealing of hole utensil to carry out injection hole sealing with pressure, sealed borehole length 20 ~ 35m:(7) mash gas extraction of networking, after sealing of hole, treat sealing of hole slurry consolidation 24 hours, pressure testing checks that sealing quality reaches requirement and can to network mash gas extraction, to drainage holes routine test extraction parameter, investigates extracting result.
Underground coal mine is connected with (4) pipe collar and (5) interior stay tube section by section along method (3) screen casing of coal bed drilling inner support tube mash gas extraction, then tightens before docking at the even daub in connecting thread place, prevents gas leakage.(7) grouting pump is utilized before networking extraction, by gas pumping pipe to injected clear water in extraction borehole, grouting pump pressure show value rises to regulation and requires and stablize to the stipulated time, and anhydrous around leaking out of holing, then drilling and sealing is up-to-standard, mash gas extraction of can networking.
Accompanying drawing explanation
Fig. 1 is inner support polyvinyl chloride tubular structure cut away view; Fig. 2 is along coal bed drilling inner support tube installation drawing.
Claims (4)
1. a underground coal mine is along the method for coal bed drilling inner support pipe laying mash gas extraction, (1) hole, with the hydraulic drill rig of large torque (T >=2000KN) along seam inclination or move towards the boring of direction construction concordant, hole depth 60 ~ 85m:(2) aperture blowing, after Completion of Drilling Hole, with coal dust in pressure wind clear opening; (3) screen casing under, screen casing and common inner support tube connect lower at the bottom of hole section by section, and screen casing is that the small-bore Drilling operation boring respective numbers on common inner support tube tube wall forms; (4) upper pipe collar, pipe collar machining internal thread is connected with inner support tube; (5) connect interior stay tube section by section, common inner support tube external diameter and single-unit length can according to extraction main networking requirements processing in coal mine down-hole tunnel, general single-unit length 2 ~ 3m, and pipe two ends respectively process outer connecting thread; (6) sealing of hole, in hole under pipe after design attitude, employing micro-expansion cement mortar, polyurethane carry out sealing of hole, or adopt underground mine use sealing of hole utensil to carry out injection hole sealing with pressure, sealed borehole length 20 ~ 35m:(7) mash gas extraction of networking, after sealing of hole, treat sealing of hole slurry consolidation more than 24 hours, pressure testing checks that sealing quality reaches requirement and can to network mash gas extraction.
2. underground coal mine according to claim 1 is along the method for coal bed drilling inner support tube mash gas extraction, it is characterized in that: screen casing (3), pipe collar (4), inner support tube (5) enter the interior also sealing of hole of coal bed drilling under connecting successively, connecting thread place uniform gluing, prevents gas leakage.
3. the underground coal mine according to claim 1,2 is along the method for coal bed drilling inner support tube mash gas extraction, it is characterized in that: after (7) sealing of hole, before extraction, answer testing bore holes airtight quality, the boring networking mash gas extraction meeting sealing quality requirement, routine test extraction parameter, investigation extracting result.
4. the underground coal mine according to claim 1,2,3 is along the method for coal bed drilling inner support tube mash gas extraction, it is characterized in that: inner support pipe laying high compressive strength reaches 25MPa, the development speed of controlling drilling hole shrinkage strain, the coal bed drilling maintenance design section time is made to reach 1 year, for Gas Flow and extraction provide unimpeded channel, it is the new method that coal mine gas extraction work reduces costs, raises the efficiency.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410059823.1A CN104863625A (en) | 2014-02-21 | 2014-02-21 | Method for extracting gas from underground coal mine by adopting internal support pipe through drilling along coal seam |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410059823.1A CN104863625A (en) | 2014-02-21 | 2014-02-21 | Method for extracting gas from underground coal mine by adopting internal support pipe through drilling along coal seam |
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| CN104863625A true CN104863625A (en) | 2015-08-26 |
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| CN201410059823.1A Pending CN104863625A (en) | 2014-02-21 | 2014-02-21 | Method for extracting gas from underground coal mine by adopting internal support pipe through drilling along coal seam |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106988777A (en) * | 2017-05-02 | 2017-07-28 | 阳泉煤业集团华越机械有限公司 | A kind of method that utilization screen casing draws out methane |
| CN107143374A (en) * | 2017-06-29 | 2017-09-08 | 张海轩 | The gas production method and system of belt pressing type drilling malleation mining |
| CN109030054A (en) * | 2018-08-17 | 2018-12-18 | 西安科技大学 | This coal seam directional drilling process simulation experimental rig of one kind and method |
| CN111119978B (en) * | 2019-12-04 | 2021-12-14 | 湖南科技大学 | Method for extracting coal seam gas by drilling holes in bedding and hydraulically cutting seams |
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2014
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106988777A (en) * | 2017-05-02 | 2017-07-28 | 阳泉煤业集团华越机械有限公司 | A kind of method that utilization screen casing draws out methane |
| CN107143374A (en) * | 2017-06-29 | 2017-09-08 | 张海轩 | The gas production method and system of belt pressing type drilling malleation mining |
| CN107143374B (en) * | 2017-06-29 | 2019-03-05 | 张海轩 | The gas production method and system of belt pressing type drilling positive pressure mining |
| CN109030054A (en) * | 2018-08-17 | 2018-12-18 | 西安科技大学 | This coal seam directional drilling process simulation experimental rig of one kind and method |
| CN109030054B (en) * | 2018-08-17 | 2020-05-19 | 西安科技大学 | Simulation test device and method for directional drilling process of local coal seam |
| CN111119978B (en) * | 2019-12-04 | 2021-12-14 | 湖南科技大学 | Method for extracting coal seam gas by drilling holes in bedding and hydraulically cutting seams |
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Application publication date: 20150826 |