CN105134286A - Method for extracting gas of gob of L-shaped well - Google Patents
Method for extracting gas of gob of L-shaped well Download PDFInfo
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- CN105134286A CN105134286A CN201510656784.8A CN201510656784A CN105134286A CN 105134286 A CN105134286 A CN 105134286A CN 201510656784 A CN201510656784 A CN 201510656784A CN 105134286 A CN105134286 A CN 105134286A
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- gas
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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 relates to a coal mine extraction method and particularly relates to a method for extracting gas of a gob of an L-shaped well. According to the method for extracting gas of the gob of the L-shaped well, a horizontal borehole is formed in a stratum of a fissure zone above a top board of a working plane by virtue of a ground well construction technique and is connected to the ground by virtue of a vertical shaft to form an L-shaped well; in a recovery process of the working plane, gas of the gob of the working plane is extracted by virtue of a ground gas extraction pump through the L-shaped well; the projection of the horizontal borehole on the horizontal plane is located between a return airway and an inlet airway, is parallel with the return airway and the inlet airway and is close to the return airway; the front end of the horizontal borehole extends above a cutting hole of the working plane. By virtue of the method, the problem that the gas content of an upper corner in the recovery process of the working plane is high is solved, and the safe extraction of the working plane is guaranteed; by virtue of the spatial position of the horizontal borehole, the gas extraction work can be well finished by virtue of the method, and actual work requirements are met.
Description
Technical field
The present invention relates to coal mine gas drainage method, be specially a kind of L-type well goaf gas pumping method.
Background technology
By the discussion of long-term gas govenance, top board high drill holes extracting is the effective measures that goaf gas is administered.Limit by down-hole mining Time and place, the construction of down-hole High Position Drilling easily affects by linking, and bore diameter, layer position are difficult to ensure, causes its effect unstable.Carry out large number of ground at present and adopted well test extraction goaf gas, achieve certain effect.But by mining influence, adopt well and easily collapse stifled, general effective range is less, rate of air sucked in required is difficult to meet high methane and adopts face gas control needs.Therefore be starved of and a kind ofly can meet high methane and adopt the method that needs are administered in face extraction.
Summary of the invention
The present invention solves current high methane to adopt the technical problem that face gas pumping can not meet actual improvement needs, provides a kind of L-type well goaf gas pumping method.
The present invention realizes by the following technical solutions: a kind of L-type well goaf gas pumping method, utilizes surface well construction technology, a bite horizontal drilling of constructing in the fissure zone rock stratum above face roof, and is connected with ground by vertical shaft, forms L-type well; When working face extraction, ground gas extraction pump is utilized to carry out extraction by L-type well to the goaf gas of work plane; Described horizontal drilling is parallel to above-mentioned two tunnels in the projection of horizontal plane between return airway and air intake lane; Described horizontal drilling in the projection of horizontal plane near return airway; The front end of horizontal drilling extends to above working face open-off cut eye.
The horizontal segment layer position at concrete horizontal drilling place at work plane apart from the roof fracture band rock stratum in return airway horizontal range certain limit.When working face extraction, select and utilize supporting ground gas extraction pump to carry out extraction by L-type well to the high-order high concentration gas in the goaf of work plane, and then solving goaf and gas at upper corner in working face extraction process and to gush out large problem.
The present invention solves the problem that in working face extraction process, gas at upper corner is large, ensures the effective ways of work plane safety coal extraction.The locus of horizontal drilling determines the work that this method can be good at mash gas extraction, meets the demand of real work.
Further, the horizontal drilling of described L-type well and return airway are 10-60m in the spacing of the projection of horizontal plane.
The distance of horizontal drilling and return airway effectively can ensure the dynamics of extraction in the spacing that horizontal plane projects, the gas of work plane as far as possible by extraction, and can not can be had an impact to the actual mining of work plane.
Further, the bore of described horizontal drilling is for being greater than 150mm.
The bore of horizontal drilling can realize the abundant extraction to gas.
The present invention also has the following advantages: 1. can substitute underground top plate High Position Drilling, and pumping volume is stable, concentration is high; 2. L-type well construction in ground does not affect down-hole and adopts face preparatory construction; 3., after working face extraction, ground L-type well can continue extraction, realizes resource and reclaims to greatest extent.
Accompanying drawing explanation
The flat perspective view of Fig. 1 L-type of the present invention well water.
Fig. 2 is the generalized section of the L-type well of invention.
Detailed description of the invention
A kind of L-type well goaf gas pumping method, is utilized surface well construction technology, a bite horizontal drilling of constructing in the fissure zone rock stratum above face roof, and is connected with ground by vertical shaft, form L-type well; When working face extraction, ground gas extraction pump is utilized to carry out extraction by L-type well to the goaf gas of work plane; Described horizontal drilling is parallel to above-mentioned two tunnels in the projection of horizontal plane between return airway and air intake lane; Described horizontal drilling in the projection of horizontal plane near return airway; The front end of horizontal drilling extends to above working face open-off cut eye.
The horizontal drilling of described L-type well and return airway are 10-60m in the spacing of the projection of horizontal plane.
The bore of described horizontal drilling is for being greater than 150mm.
The key technology of L-type well determines best air guide fissure zone, be subject to existing method determination work plane "O"-ring distribution and the roof fracture bands such as the on-the-spot test of mining influence by theoretical research, numerical simulation, conventional ground coal bed gas well, thus finally determine best air guide fissure zone.L-type well horizontal segment layer position utilizes surface well construction technology to complete drilling well after determining.When working face extraction, open ground gas extraction pump and take out goaf gas by L-type well, reduce and adopt gushing out of goaf gas in the exploitation process of face, ensure that the safety coal extraction of work plane.As shown in Figure 1, 2, horizontal drilling is parallel with return airway and close in the projection of horizontal plane, and horizontal drilling is arranged in the fissure zone rock stratum above work plane, and such spatial design can guarantee extracting result.
Claims (3)
1. a L-type well goaf gas pumping method, is characterized in that: utilize surface well construction technology, a bite horizontal drilling of constructing in the fissure zone rock stratum above face roof, and is connected with ground by vertical shaft, forms L-type well; When working face extraction, ground gas extraction pump is utilized to carry out extraction by L-type well to the goaf gas of work plane; Described horizontal drilling is parallel to above-mentioned two tunnels in the projection of horizontal plane between return airway and air intake lane; Described horizontal drilling in the projection of horizontal plane near return airway; The front end of horizontal drilling extends to above working face open-off cut eye.
2. L-type well goaf gas pumping method as claimed in claim 1, is characterized in that: the horizontal drilling of described L-type well and return airway are 10-60m in the spacing of the projection of horizontal plane.
3. L-type well goaf gas pumping method as claimed in claim 1 or 2, is characterized in that: the bore of described horizontal drilling is for being greater than 150mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201510656784.8A CN105134286B (en) | 2015-10-13 | 2015-10-13 | L-type well goaf gas pumping method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510656784.8A CN105134286B (en) | 2015-10-13 | 2015-10-13 | L-type well goaf gas pumping method |
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| Publication Number | Publication Date |
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| CN105134286A true CN105134286A (en) | 2015-12-09 |
| CN105134286B CN105134286B (en) | 2017-12-19 |
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| CN201510656784.8A Active CN105134286B (en) | 2015-10-13 | 2015-10-13 | L-type well goaf gas pumping method |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105545205A (en) * | 2015-12-23 | 2016-05-04 | 大同煤矿集团有限责任公司 | High-strength gas extraction ground L-shaped drilling method for fully mechanized caving faces |
| CN109488381A (en) * | 2018-12-11 | 2019-03-19 | 太原理工大学 | A kind of method of accurate determining goaf gas extraction best well location and layer position |
| CN109538282A (en) * | 2018-09-28 | 2019-03-29 | 山西晋城无烟煤矿业集团有限责任公司 | A kind of coal bed gas adopts L-type well horizontal segment layer position preferred method |
| CN111022109A (en) * | 2019-12-24 | 2020-04-17 | 山西晋城无烟煤矿业集团有限责任公司 | Method for extracting gas in closed goaf |
| CN111927399A (en) * | 2020-07-29 | 2020-11-13 | 山西晋城无烟煤矿业集团有限责任公司 | Coal mine mining area gas extraction method |
| CN112012783A (en) * | 2020-08-07 | 2020-12-01 | 太原理工大学 | Anti-damage ground drilling gas extraction method |
| CN112145224A (en) * | 2020-10-26 | 2020-12-29 | 山西晋城无烟煤矿业集团有限责任公司 | Mining area coal seam roof multi-branch horizontal well construction method |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105545205A (en) * | 2015-12-23 | 2016-05-04 | 大同煤矿集团有限责任公司 | High-strength gas extraction ground L-shaped drilling method for fully mechanized caving faces |
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| CN109538282A (en) * | 2018-09-28 | 2019-03-29 | 山西晋城无烟煤矿业集团有限责任公司 | A kind of coal bed gas adopts L-type well horizontal segment layer position preferred method |
| CN109488381A (en) * | 2018-12-11 | 2019-03-19 | 太原理工大学 | A kind of method of accurate determining goaf gas extraction best well location and layer position |
| CN111022109A (en) * | 2019-12-24 | 2020-04-17 | 山西晋城无烟煤矿业集团有限责任公司 | Method for extracting gas in closed goaf |
| CN111927399A (en) * | 2020-07-29 | 2020-11-13 | 山西晋城无烟煤矿业集团有限责任公司 | Coal mine mining area gas extraction method |
| CN112012783A (en) * | 2020-08-07 | 2020-12-01 | 太原理工大学 | Anti-damage ground drilling gas extraction method |
| CN112145224A (en) * | 2020-10-26 | 2020-12-29 | 山西晋城无烟煤矿业集团有限责任公司 | Mining area coal seam roof multi-branch horizontal well construction method |
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| CN105134286B (en) | 2017-12-19 |
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