CN102587959B - Method for draining coal seam gas - Google Patents
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- CN102587959B CN102587959B CN201210064907.5A CN201210064907A CN102587959B CN 102587959 B CN102587959 B CN 102587959B CN 201210064907 A CN201210064907 A CN 201210064907A CN 102587959 B CN102587959 B CN 102587959B
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Abstract
The invention relates to a method for draining coal seam gas, belonging to a method for pre-draining coal seam gas in coal mines. According to the invention, the technical problem that the existing methods for draining coal seam gas are low in drainage efficiency is solved. The technical scheme of the method for draining coal seam gas comprises the steps of: firstly opening at least one butt hole drill site in a coal mine underground preparation roadway, constructing a 30-50m long butt drill hole from the butt hole drill site to a target coal seam, lowering a seamless steel sleeve to the butt drill hole and solidifying the hole by high-quality cement, then opening a ground drill site at the far end of a designed drainage area, horizontally and directionally drilling a horizontal directional main branch hole along the target coal seam toward the underground butt drill hole, butt-jointing the horizontal directional main branch hole with the underground but drill hole, enclosing the ground orifice, arranging an orifice control valve on the head of the seamless steel sleeve, connecting the control valve with a coal mine underground gas drainage pipe network, and carrying out gas drainage by using a coal mine gas drainage pump.
Description
Technical field
The present invention relates to a kind of method of draining coal seam gas, it belongs to a kind of colliery that is applicable to development section or its adjacent domain coal-bed gas carry out pre-extraction method.
Background technology
Coal mine gas (also referred to as " coal bed gas ", main component is methane) is one of major casualty threatening Safety of Coal Mine Production, is again the abundant clean energy resourcies of a kind of reserves simultaneously.China is subject to the mine (especially highly gassy mine) that Gas Disaster threatens generally to adopt the mode of taking out in advance to prevent and treat Gas Disaster at present, and the methane gas of extracting out is utilized.
At present, coal mine gas drainage mode can be divided into generally: ground well drainage and the large class of down-hole extraction two.Wherein: ground well drainage can be divided into again straight well extraction and horizontal directional drilling extraction; Down-hole extraction comprises down-hole drilling extraction, two kinds of forms of underworkings extraction.
The extraction of ground level directed drilling is exactly to allow to the underground endways well of beating, turn curvedly, then digs a well sidewards along the direction in coal seam.The principle that directed drilling gathers coal bed gas is the same with ground straight well pumping method, that is:, by drainage and step-down, make to be in coal body the methane that adsorbed state exists and resolve, and along the microfissure of coal body, hole seepage flow out, then gathers.Horizontal directional drilling is with the difference of vertically drilling well: the latter only gathers gas with vertical shaft through coal seam, and the well of horizontal orientation well is extended along the tendency in coal seam, greatly increase the contact area in well and coal seam, thereby reached the object that improves gas well output and gas production efficiency.
Down-hole drilling extraction,, under coal mine, drill site is set, with coal mine roadway drilling machine construction along coal bed drilling or layer-through drilling (comprising up boring, descending boring), by the boring access coal mine gas extraction pipeline of having constructed, utilize the gas in this coal seam of drainage pump extraction or up/down adjacent coal seam again.
Generally speaking, adopt ground level directed drilling and adopt down-hole drilling draining coal seam gas to have respectively following excellent, shortcoming:
1, the advantage of ground level directed drilling extraction is: 1) in the methane gas of extraction, methane concentration is high, generally more than 95%, of many uses.2) with respect to coal mine operation environment, ground drill site is open, and the type selecting scope of drilling equipment is wide, can adopt high-power drilling equipment, so the efficiency of drillng operation is high.3) utilize ready-made oil, the high-power drilling equipment of natural gas, multiple-limb, the heavy caliber wellhole that can in coal seam, construct out more than km, so extraction efficiency is high, individual well daily output tolerance can reach several ten thousand steres.4), owing to having difference in height between ground and subterranean coal, boring well is good at an overfill protection compacted under of drilling well liquid columnpressure, is difficult for collapse hole, is conducive to gas pumping.Its shortcoming is: 1) the drainage and step-down cycle long, wellhole must be away from coal production operation area, with guarantee gas well within effective campaign not the digging activity because of colliery be damaged.2) need to bury gas transmission line underground on ground, the methane gas of extraction is transported to gas gathering station.3) burying underground of extraction Active workings, gas transmission line all needs land occupation, increased cost, and ecological environment is existed to adverse effect.
2, the advantage of coal mine down-hole drilling extraction is: 1) between the aperture of down-hole drilling and eyelet, the discrepancy in elevation is very little, even lower than well, therefore the drainage and step-down cycle is short, for most of colliery, because coal seam moisture content is extremely low, only need automatic draw off valve be set in extraction pipeline can solve drainage problem.2) can utilize existing extraction pipeline in coal mine down-hole tunnel that extraction methane gas is delivered directly to gas gathering station.3) gas production operation is carried out under coal mine, does not have land occupation problem.Its shortcoming is: 1), owing to restricted by many factors, down-hole drilling sealing quality is low, poor air-tightness, in the methane gas of extraction, sneaked into some extent underground air, cause methane concentration low, generally can only be as the source of the gas of gas fired-boiler, be used for heat supply or generating.At present, still there is a large amount of extraction gas in domestic colliery, too low and cannot utilize due to its methane concentration, can only directly enter atmosphere, causes environment pollution.2) be subject to underground work spatial limitation, down-hole drilling equipment power is low, and labor strength is large, and drillng operation efficiency is low, and production has high input.3) owing to being subject to the restriction of rig equipment capability, the general aperture of boring of underground construction is little, distance is short, and single hole gas deliverability is low, conventionally can only make up with increasing cloth hole density, thereby need to consume a large amount of human and material resources and financial resources.4) because the discrepancy in elevation between coal mine down-hole tunnel and coal seam is little, during drilling well, the head of liquid of drilling fluid is not enough to eyelet to form effective support, well easily occurs during drilling construction and collapse, and not only causes lock of tool drilling, and can block extraction passage, be unfavorable for gas pumping.
Summary of the invention
The object of the invention is to solve the above-mentioned technical problem that the method for existing draining coal seam gas exists, and a kind of method of the draining coal seam gas that ground level directional well is docked with coal mine down-hole drilling is provided.
The present invention solves the problems of the technologies described above the technical scheme adopting to be: a kind of method of draining coal seam gas, first it open up at least one butt hole drill site under coal mine in preparatory working, the opposite bore of a 30～50m of construction from this butt hole drill site to target coal seam is lowered to the solid hole of seamless steel sleeve Guan Bingyong high-mark cement in opposite bore; Then at the far-end in design extraction region, open up a ground drill site, to down-hole opposite bore direction, prop up hole along target coal seam construction level Directional Drilling horizontal orientation master, the docking of the main Zhi Kongyu of horizontal orientation down-hole opposite bore; Then seal aperture, ground, on the seamless steel sleeve pipe tube head of down-hole opposite bore, aperture by-pass valve control is installed, by-pass valve control is connected with coal mine gas extraction pipe network, utilizes gas discharge in mine pump to carry out gas pumping.
The present invention props up on hole described horizontal orientation master, and a plurality of horizontal orientation branch holes can also be set, further to increase the contact area in drainage holes and coal seam.
The upstream or downstream of can constructing when preparatory working is below or above target coal seam under described coal mine boring.
Under described coal mine, preparatory working can also be substituted by development work.
Because the present invention has adopted technique scheme, the advantage of ground level directed drilling pumping method and coal mine down-hole drilling pumping method is combined, made up these two kinds of gas pumping methods inferior position separately.Therefore, compare with background technology, the present invention has advantages of can improve extraction coal mine gas efficiency.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of first embodiment of the invention;
Fig. 2 is the schematic diagram of second embodiment of the invention;
Fig. 3 is the schematic diagram of third embodiment of the invention;
Fig. 4 is the I in Fig. 1, Fig. 2 and Fig. 3---I sectional drawing;
Fig. 5 is the II in Fig. 1, Fig. 2 and Fig. 3---II sectional drawing;
Fig. 6 is the III in Fig. 1, Fig. 2 and Fig. 3---III sectional drawing.
In figure: preparatory working under 1-coal mine, 2-butt hole drill site, 3-target coal seam, 4-opposite bore, 5-seamless steel sleeve pipe, 6-high-mark cement, 7-design extraction region, 8-ground drill site, 9-horizontal orientation master props up hole, 10-docking point, 11-horizontal orientation branched hole.
Embodiment 1
As shown in Figure 1, the method of a kind of draining coal seam gas in the present embodiment, first it open up a butt hole drill site 2 under coal mine in preparatory working 1, opposite bore 4 from from this butt hole drill site to a 30～50m of target coal seam 3 constructions is lowered to seamless steel sleeve pipe 5 and uses the solid hole of high-mark cement 6 in opposite bore 4; Then at the far-end in design extraction region 7, open up a ground drill site 8, to down-hole opposite bore 4 directions, prop up hole 9 along target coal seam 3 construction level Directional Drilling horizontal orientation masters, horizontal orientation master props up hole 9 and docks with down-hole opposite bore 4 through docking point 10; Then seal aperture, ground, on seamless steel sleeve pipe 5 tube heads of down-hole opposite bore, aperture by-pass valve control is installed, by-pass valve control is connected with coal mine gas extraction pipe network, utilizes gas discharge in mine pump to carry out gas pumping.In addition, horizontal orientation master, prop up on hole 9, a plurality of horizontal orientation branch holes 11 can also be set, further to increase the contact area of drainage holes and coal seam (gas-bearing reservoir of gas).
The upstream or downstream of can constructing when preparatory working 1 is below or above target coal seam 3 under above-mentioned coal mine boring.
Under above-mentioned coal mine, preparatory working 1 can also be substituted by development work.
Embodiment 2
As shown in Figure 2, the method of a kind of draining coal seam gas in the present embodiment, first it open up two butt hole drill sites 2 under coal mine in preparatory working 1, construct respectively from two butt hole drill sites to target coal seam 3 opposite bore 4 of a 30～50m is lowered to seamless steel sleeve pipe 5 and with the solid hole of high-mark cement 6 in opposite bore 4; Then at the far-end in design extraction region 7, open up a ground drill site 8, to down-hole opposite bore 4 directions, prop up hole 9 along two horizontal directional drill horizontal orientation masters of target coal seam 3 construction, horizontal orientation master props up hole 9 and docks with down-hole opposite bore 4 through docking point 10; Then seal aperture, ground, on seamless steel sleeve pipe 5 tube heads of two opposite bores in down-hole, aperture by-pass valve control is installed, by-pass valve control is connected with coal mine gas extraction pipe network, utilizes gas discharge in mine pump to carry out gas pumping.In addition, two horizontal orientation masters, prop up on hole 9, a plurality of horizontal orientation branch holes 11 can also be set, further to increase the contact area of drainage holes and coal seam (gas-bearing reservoir of gas).
The upstream or downstream of can constructing when preparatory working 1 is below or above target coal seam 3 under above-mentioned coal mine boring.
Under above-mentioned coal mine, preparatory working 1 can also be substituted by development work.
Embodiment 3
As shown in Figure 3, the method of a kind of draining coal seam gas in the present embodiment, first it open up three butt hole drill sites 2 under coal mine in preparatory working 1, construct respectively from three butt hole drill sites to target coal seam 3 opposite bore 4 of a 30～50m is lowered to seamless steel sleeve pipe 5 and with the solid hole of high-mark cement 6 in opposite bore 4; Then at the far-end in design extraction region 7, open up a ground drill site 8, to down-hole opposite bore 4 directions, prop up hole 9 along three horizontal directional drill horizontal orientation masters of target coal seam 3 construction, horizontal orientation master props up hole 9 and docks with down-hole opposite bore 4 through docking point 10; Then seal aperture, ground, on seamless steel sleeve pipe 5 tube heads of two opposite bores in down-hole, aperture by-pass valve control is installed, by-pass valve control is connected with coal mine gas extraction pipe network, utilizes gas discharge in mine pump to carry out gas pumping.In addition, three horizontal orientation masters, prop up on hole 9, a plurality of horizontal orientation branch holes 11 can also be set, further to increase the contact area of drainage holes and coal seam (gas-bearing reservoir of gas).
The upstream or downstream of can constructing when preparatory working 1 is below or above target coal seam 3 under above-mentioned coal mine boring.
Under above-mentioned coal mine, preparatory working 1 can also be substituted by development work.
Claims (1)
1. the method for a draining coal seam gas, it is characterized in that: first under coal mine, in preparatory working (1), open up at least one butt hole drill site (2), the opposite bore (4) of a 30～50m of construction from this butt hole drill site to target coal seam (3) is lowered to seamless steel sleeve pipe (5) and uses the solid hole of high-mark cement (6) in opposite bore; Then at the far-end that designs extraction region (7), open up a ground drill site (8), to down-hole opposite bore direction, prop up hole (9) along target coal seam construction level Directional Drilling horizontal orientation master, the main Zhi Kongjing docking point of horizontal orientation docks with down-hole opposite bore; Then seal aperture, ground, on seamless steel sleeve pipe (5) tube head of down-hole opposite bore, aperture by-pass valve control is installed, by-pass valve control is connected with coal mine gas extraction pipe network, utilizes gas discharge in mine pump to carry out gas pumping;
Described horizontal orientation master, prop up hole (9) above, a plurality of horizontal orientation branch holes (11) can also be set, further to increase the contact area in drainage holes and coal seam;
The upstream or downstream of can constructing when preparatory working is below or above target coal seam under described coal mine boring; Under described coal mine, preparatory working can also be substituted by development work.
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| CN201210064907.5A CN102587959B (en) | 2012-03-13 | 2012-03-13 | Method for draining coal seam gas |
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| CN102587959B true CN102587959B (en) | 2014-08-20 |
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| CN103437705B (en) * | 2013-08-19 | 2015-06-03 | 河南理工大学 | Directional and quick hole-forming device for mining-coal bed gas extraction multi-branch holes |
| CN104234738B (en) * | 2014-07-21 | 2017-08-15 | 河南理工大学 | A kind of hypotonic coal seam multiple-limb directional drilling slot anti-reflection method |
| CN104806285A (en) * | 2015-03-25 | 2015-07-29 | 宁夏煤炭勘察工程公司 | Coal mine goaf gas control method based on ground horizontal well |
| CN104819008B (en) * | 2015-04-17 | 2016-04-27 | 陕西福瑞德石油科技有限公司 | A kind of efficient pumping method of coal-bed gas |
| CN105257333B (en) * | 2015-05-30 | 2018-12-11 | 山西晋城无烟煤矿业集团有限责任公司 | Km drilling machine concentrates strip-type drainage method |
| CN107420126B (en) * | 2017-07-26 | 2024-03-29 | 柴兆喜 | Pressure equalizing circulation mine gas extraction system |
| CN107339093A (en) * | 2017-08-25 | 2017-11-10 | 辽宁工程技术大学 | A kind of drilling well for gas drainage method for arranging of imitative schneider zelkova leaf kank structure |
| CN108223004B (en) * | 2018-01-05 | 2019-04-26 | 中煤科工集团重庆研究院有限公司 | Method for extracting gas by combining bidirectional three-dimensional staggered drilling with directional long drilling |
| CN108590716A (en) * | 2018-04-18 | 2018-09-28 | 中国矿业大学 | A kind of tunnel crosses rich water tomography tree root type and dredges water blockoff integral construction method |
| CN108625824A (en) * | 2018-05-02 | 2018-10-09 | 辽宁工程技术大学 | A kind of buried aqueous coal bed gas extraction drilling method for arranging |
| CN110953015B (en) * | 2019-12-25 | 2021-04-13 | 太原理工大学 | Soft low-permeability coal seam long-drill-hole directional segmented fracturing efficient gas extraction method |
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