CN102777205B - Method for determining spatial position of horizontal well for gas drainage in worked-out area - Google Patents
Method for determining spatial position of horizontal well for gas drainage in worked-out area Download PDFInfo
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- CN102777205B CN102777205B CN201210283141.XA CN201210283141A CN102777205B CN 102777205 B CN102777205 B CN 102777205B CN 201210283141 A CN201210283141 A CN 201210283141A CN 102777205 B CN102777205 B CN 102777205B
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- 238000000034 method Methods 0.000 title claims abstract description 16
- 239000003245 coal Substances 0.000 claims abstract description 18
- 238000005452 bending Methods 0.000 claims abstract description 12
- 238000009825 accumulation Methods 0.000 claims description 8
- 238000005065 mining Methods 0.000 abstract description 9
- 239000007789 gas Substances 0.000 description 37
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 12
- 238000005516 engineering process Methods 0.000 description 6
- 238000000605 extraction Methods 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 238000010276 construction Methods 0.000 description 5
- 239000011435 rock Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
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Abstract
The invention discloses a method for determining spatial position of a horizontal well for gas drainage in a worked-out area, comprising the following steps: step one of enabling running directions of the horizontal well to be the same as running direction of a coal bed in a specific mining face; step two of dividing a mining area into a caving zone, a fissure zone and a bending subsidence zone from bottom to top along a vertical direction; and arranging the horizontal well in the fissure zone rather than the caving zone and the bending subsidence zone; step three of arranging the horizontal well in a gas gathering area; step four of enabling a horizontal section of the horizontal well to tilt to a coal face; and step five of determining spatial position of a straight hole section and a deflecting section of the horizontal well according to a design of spatial position of the horizontal section of the horizontal well. The method provided by the invention has the advantages as follows: spatial position of the horizontal well is determined when gas drainage is carried out in the worked-out area by taking running direction, height apart from coal face and distance of inner interlocked wind roads of the horizontal section of the horizontal well as main content, so that method is simple, and steps are clear.
Description
Technical field
The invention belongs to field of mining, specifically a kind of definite horizontal well is in the method for the locus of goaf gas drainage.
Background technology
Horizontal well technology has not only obtained generally paying attention to and fast development in oil, natural gas extraction, and extends to other field gradually and bring into play the effect of wanting emphatically, is widely used as also obtained in pipe installation, municipal engineering; At present, horizontal well technology is also more and more paid attention to and is demonstrated application prospect aspect gas drainage under suction.Gas drainage under suction is all significant for coal mine production safety and methane resource utilization; Goaf gas drainage is a kind of wherein method of gas discharge in mine at present.Horizontal well technology is applied to goaf gas drainage, can realizes and drawing out methane with roof water horizontal well; Roof water horizontal well substitutes Gao Chou lane or alternate manner draws out methane, and has shortening construction period, alleviates face and takes over nervous situation, saves construction cost, realizes the advantage that " long-hole instead of roadway " draws out methane.
As shown in Figure 1, conventionally, horizontal well comprises straight hole section 1, inclination section 2 and horizontal segment 3.Adopting horizontal well to carry out in the whole technology of gas drainage under suction in goaf, determine that the locus of horizontal well horizontal segment 3 is very important, whether horizontal well horizontal segment 3 positions are suitable, very large for gas drainage under suction influential effect.But at present,, to this research seldom, and much situation is to rely on construction experience, is unfavorable for ensureing gas drainage under suction effect.
Summary of the invention
In order to overcome horizontal well when the goaf gas drainage, for the definite research in horizontal well locus less, case is few, the deficiency that relies on construction experience, the invention provides the method for a kind of definite horizontal well in goaf gas drainage time space position, it is provided with the trend of horizontal well, the position above work plane, inclined degree.
The present invention is achieved in that the method for a kind of definite horizontal well in the locus of goaf gas drainage, and it comprises the following steps:
The first step, the trend of horizontal well is determined: the trend of horizontal well is consistent with the trend in coal seam in concrete exploitation work plane;
Second step, horizontal well is determined work plane top position, i.e. the horizontal segment of horizontal well determining apart from the height in coal seam: at minery vertically from lower to upper, be divided into caving zone, fissure zone, bending subsidence band, horizontal well is avoided caving zone, bending subsidence band, and is arranged in fissure zone;
The 3rd step, the horizontal segment of horizontal well is determined the distance of interior wrong air way: horizontal well is arranged in to gas accumulation district;
The 4th step, the horizontal segment of horizontal well tilts to coal-face direction;
The 5th step, according to the design of the horizontal segment locus of above horizontal well, determines the locus of the inclination section of straight hole section, the horizontal well of horizontal well.
The invention has the beneficial effects as follows, while adopting horizontal well technology to carry out gas drainage under suction in goaf, can carry out simple, clear and definite determining to the locus of horizontal well according to the method, that is to say: taking the trend of horizontal well horizontal segment, apart from the distance of the height in coal seam, interior wrong air way as main contents, realize in the time of goaf gas drainage, determining of horizontal well locus, method is simple, step is clear and definite.
Brief description of the drawings
Fig. 1 is the structural representation of existing level well and working seam.
Fig. 2 is the flow chart of definite horizontal well provided by the invention in the method for the locus of goaf gas drainage.
Fig. 3 be in preferred embodiments of the present invention coal-face overlying rock along subregion and the vertical point of band structure schematic diagram of advance of the face direction.
Fig. 4 is goaf gas flow field schematic diagram in preferred embodiments of the present invention.
Detailed description of the invention
In order to make object of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
Refer to Fig. 2, it is the flow chart of a kind of definite horizontal well provided by the invention in the method for the locus of goaf gas drainage, it comprises the following steps: first step S21, and the trend of horizontal well is determined: the trend of horizontal well is consistent with the trend in coal seam in concrete exploitation work plane; Second step S22, horizontal well is determined work plane top position, be horizontal segment the determining apart from the height in coal seam of horizontal well: at minery vertically from lower to upper, be divided into caving zone, fissure zone, bending subsidence band, horizontal well is avoided caving zone, bending subsidence band, and is arranged in fissure zone; The 3rd step S23, the horizontal segment of horizontal well is determined the distance of interior wrong air way: horizontal well is arranged in to gas accumulation district; The 4th step S24, the horizontal segment of horizontal well tilts to coal-face direction; The 5th step S25, according to the design of the horizontal segment locus of above horizontal well, determines the locus of the inclination section of straight hole section, the horizontal well of horizontal well.
Subsequent, definite horizontal well of the present invention is elaborated in the method for the locus of goaf gas drainage.
First step S21, according to the Reservoir Characters of goaf gas, due to the existence of mining induced fissure in the goaf overlying rock of working seam, for preserving, goaf gas provides space, so, the region that horizontal well is arranged in to absciss layer cranny development and can keeps for a long time, being conducive to gas pressure relief flow in horizontal well, thereby ensure that effective extraction time of horizontal well is long, extraction scope is large, and gas pumping rate is high; The trend of horizontal well should be consistent with the trend in coal seam in concrete exploitation work plane, and this makes within vertical distance between horizontal well and working seam remains on a rational scope.
Second step S22, horizontal well is determined work plane top position: at minery vertically from lower to upper, be divided into caving zone I, fissure zone II, bending subsidence band III; If horizontal well is arranged in caving zone I, the passage being formed by exploitation inbreak is just very unimpeded, but the gas density of extraction can be very low like this; If be arranged in bending subsidence band III, crack agensis, horizontal well and gas drainage under suction space do not have enough cracks to link up, and do not become good passage, can't pump out like this gas; So horizontal well should be avoided caving zone I, bending subsidence band III, and is arranged in fissure zone II, as shown in Figure 3.In Fig. 3,1. symbol is expressed as rib and supports influence area, and 2. symbol is expressed as absciss layer district, and 3. symbol is expressed as compacting zone again.
The 3rd step S23, the flow performance according to gas in overlying rock crack, goaf, as shown in Figure 4, in order to increase the efficiency drawing out methane, should be arranged in horizontal well gas accumulation district.Above three steps, have namely determined the trend of horizontal well horizontal segment, apart from the height in coal seam, the distance of interior wrong air way.
The 4th step S24, in order to prevent the horizontal sector hole internal water accumulation of horizontal well, affects the extraction of gas, and horizontal segment is not complete level, but horizontal segment will be to slightly low dip of coal-face direction, so that hole internal water accumulation flows to goaf.
The 5th step S25, according to the design of horizontal well horizontal segment locus, determines the locus of horizontal well straight hole section, inclination section; While determining the locus of inclination section, radius of curvature design will meet the flexible requirement of drilling tool.
For determining that horizontal well is in the above-mentioned detailed description of the method for the locus of goaf gas drainage, select and illustrate as next embodiment.
The first mining face in Liu Zhuan colliery moves towards long 1260m, and wide 215m tilts; Working seam is 13-1 coal, the degree of depth-660, coal seam～-720m, coal seam thickness 3.50～5.00m, 3～5 ° of seam inclinations; Dark 265～the 280m of bedrock surface.The first step, according to the trend in 13-1 coal seam in first mining face, the trend of selection level well is consistent with the trend in coal seam.Second step, the regularity of rock shift of the caving zone manifesting according to Huainan Mining Area 13-1 seam mining, fissure zone, bending subsidence band, the height of determining horizontal well horizontal segment is 25m left and right on 13-1 roof.The 3rd step, the gas drainage under suction effect of the flow performance according to gas in overlying rock crack, goaf and in the past Huainan Mining Area, determines that the design attitude of horizontal well horizontal segment is in interior wrong air way 30m left and right.The 4th step, in order to prevent the horizontal sector hole internal water accumulation of horizontal well, affects the extraction of gas, and horizontal segment is to slightly low dip of coal-face direction, so that hole internal water accumulation flows to goaf; This example is taked the gradient of 2%-3%.The 5th step, after the locus of horizontal well horizontal segment is determined, just can determine the locus of horizontal well straight hole section, inclination section; While determining the locus of inclination section, radius of curvature design will meet the flexible requirement of drilling tool; The inclination section radius of curvature of this example is designed to 200m, and rate of increase of angle is 0.287 °/m.The horizontal well construction for goaf gas drainage of this example, becomes well probing total footage 1116.60m, whole bore dia 215.9mm, and the horizontal segment of horizontal well is about 380m, and later stage gas drainage under suction is respond well.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (1)
1. definite horizontal well, in a method for the locus of goaf gas drainage, is characterized in that, it comprises the following steps:
The first step, the trend of horizontal well is determined: the trend of horizontal well is consistent with the trend in coal seam in concrete exploitation work plane;
Second step, horizontal well is determined work plane top position, i.e. the horizontal segment of horizontal well determining apart from the height in coal seam: at minery vertically from lower to upper, be divided into caving zone, fissure zone, bending subsidence band, horizontal well is avoided caving zone, bending subsidence band, and is arranged in fissure zone;
The 3rd step, the horizontal segment of horizontal well is determined the distance of interior wrong air way: horizontal well is arranged in to gas accumulation district;
The 4th step, the horizontal segment of horizontal well tilts to coal-face direction;
The 5th step, according to the design of the horizontal segment locus of above horizontal well, determines the locus of the inclination section of straight hole section, the horizontal well of horizontal well.
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| CN102777205B true CN102777205B (en) | 2014-06-11 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103016047B (en) * | 2012-12-20 | 2015-05-20 | 大同煤矿集团有限责任公司 | Method of draining gas in gob through long drill hole in roof trend on fully mechanized caving face |
| CN104594943A (en) * | 2015-01-20 | 2015-05-06 | 大同煤矿集团有限责任公司 | Ground composite L-shaped drilling well for gas control and gas control method |
| CN112012783B (en) * | 2020-08-07 | 2022-04-15 | 太原理工大学 | Anti-damage ground drilling gas extraction method |
| CN111911116B (en) * | 2020-09-11 | 2022-05-17 | 中煤科工集团重庆研究院有限公司 | Gas extraction method for short-distance coal seam group L-shaped ground well |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2256079C1 (en) * | 2004-04-05 | 2005-07-10 | Государственное образовательное учреждение высшего профессионального образования Санкт-Петербургский государственный горный институт им. Г.В. Плеханова (технический университет) | Method for extracting methane from coal bed |
| CN201474608U (en) * | 2009-08-19 | 2010-05-19 | 兴和鹏能源技术(北京)有限公司 | Coal-bed-gas production-increase and gas water-inrush-prevention horizontal well |
| CN102080526A (en) * | 2011-01-17 | 2011-06-01 | 河南理工大学 | Method for extracting gas from bedding level fractured well of ground coal seam roof |
| CN102086774A (en) * | 2011-01-17 | 2011-06-08 | 中联煤层气国家工程研究中心有限责任公司 | Drainage method of gas in coal bed |
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| US8297377B2 (en) * | 1998-11-20 | 2012-10-30 | Vitruvian Exploration, Llc | Method and system for accessing subterranean deposits from the surface and tools therefor |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2256079C1 (en) * | 2004-04-05 | 2005-07-10 | Государственное образовательное учреждение высшего профессионального образования Санкт-Петербургский государственный горный институт им. Г.В. Плеханова (технический университет) | Method for extracting methane from coal bed |
| CN201474608U (en) * | 2009-08-19 | 2010-05-19 | 兴和鹏能源技术(北京)有限公司 | Coal-bed-gas production-increase and gas water-inrush-prevention horizontal well |
| CN102080526A (en) * | 2011-01-17 | 2011-06-01 | 河南理工大学 | Method for extracting gas from bedding level fractured well of ground coal seam roof |
| CN102086774A (en) * | 2011-01-17 | 2011-06-08 | 中联煤层气国家工程研究中心有限责任公司 | Drainage method of gas in coal bed |
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