CN102587959A - Method for draining coal seam gas - Google Patents
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- CN102587959A CN102587959A CN2012100649075A CN201210064907A CN102587959A CN 102587959 A CN102587959 A CN 102587959A CN 2012100649075 A CN2012100649075 A CN 2012100649075A CN 201210064907 A CN201210064907 A CN 201210064907A CN 102587959 A CN102587959 A CN 102587959A
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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 extraction coal-bed gas, it belongs to a kind of method that is applicable to that preparatory extraction is carried out to development section or its adjacent domain coal-bed gas in the colliery.
Background technology
Coal mine gas (be also referred to as " coal bed gas ", main component is a methane) is one of major casualty that threatens Safety of Coal Mine Production, is again simultaneously the abundant clean energy resourcies of a kind of reserves.China receives the mine (especially highly gassy mine) of gas disaster threat generally to adopt the mode of taking out in advance to prevent and treat the gas disaster at present, and the methane gas of extracting out is utilized.
At present, coal mine gas extraction mode can be divided into generally: two big types of ground drilling extraction and down-hole extractions.Wherein: the ground drilling extraction can be divided into straight well extraction and horizontal directional drilling extraction again; The 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 let turn individual bending to the underground endways well of beating, and digs a well sidewards along the direction in coal seam again.The principle that directed drilling is gathered coal bed gas is the same with ground straight well pumping method, that is: through drainage and step-down, make to be the methane that adsorbed state exists in the coal body and to resolve, and comes out along microfissure, the hole seepage flow of coal body, gathers again.Horizontal directional drilling is with the difference of vertically drilling well: the latter only passes the coal seam with vertical shaft and gathers gas; And the well of horizontal orientation well is extended along the tendency in coal seam; Increase the contact area in well and coal seam greatly, thereby reached the purpose that improves gas well output and gas production efficient.
The down-hole drilling extraction; Be under coal mine, drill site to be set; With suitable coal bed drilling of coal mine roadway drilling machine construction or layer-through drilling (comprising up boring, descending boring); The good boring of will constructing again inserts coal mine gas extraction pipeline, utilize this coal seam of extraction pump extraction or on/gas in the down contiguous coal seam.
Generally speaking, adopt the ground level directed drilling and adopt down-hole drilling extraction coal-bed gas that following excellent, shortcoming is arranged respectively:
1, the advantage of ground level directed drilling extraction is: 1) methane concentration is high in the methane gas of extraction, and is generally more than 95%, of many uses.2) with respect to the coal mine operation environment, the ground drill site is open, and the type selecting scope of drilling equipment is wide, can adopt high-power drilling equipment, so the efficient of drillng operation is high.3) utilize ready-made oil, the high-power drilling equipment of natural gas, can in the coal seam, construct out multiple-limb, heavy caliber wellhole more than the km, so extraction efficient is high, individual well daily output tolerance can reach several ten thousand steres.4) owing to have difference in height between ground and the subterranean coal, the boring well is good at an overfill protection compacted under of drilling well liquid columnpressure, is difficult for the hole of collapsing, and helps gas pumping.Its shortcoming is: 1) the drainage and step-down cycle long, wellhole must be away from the Coal Production operation area, is not damaged because of the digging activity in colliery in effective campaign to guarantee gas well.2) need bury gas transmission line underground on ground, the methane gas of extraction is transported to gas gathering station.3) burying underground of extraction operation place, gas transmission line all needs land occupation, increased cost, and there is adverse effect in ecological environment.
2, the advantage of coal mine down-hole drilling extraction is: 1) discrepancy in elevation is very little between the aperture of down-hole drilling and the eyelet; Even be lower than well; Therefore the drainage and step-down cycle is short; For most of colliery,, only need that the automatic drain valve door is set and to solve drainage problem in the extraction pipeline because the coal seam moisture content is extremely low.2) can utilize that existing extraction pipeline is delivered directly to gas gathering station with the extraction methane gas in the underworkings of colliery.3) the gas production operation is carried out under coal mine, does not have the land occupation problem.Its shortcoming is: 1) owing to restricted by multiple factor, the down-hole drilling sealing quality is low, poor air-tightness; Sneaked into underground air in the methane gas of extraction to some extent; 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, because its methane concentration is crossed low and can't be utilized, can only directly enter atmosphere, causes environment pollution.2) receive the underground work spatial constraints, down-hole drilling equipment power is low, and labor strength is big, and drillng operation efficient is low, and production has high input.3) owing to receive the restriction of rig equipment capability, the general aperture of boring of down-hole construction is little, distance is short, and the single hole gas deliverability is low, can only remedy with increasing cloth hole density usually, thereby need to consume great amount of manpower and material resources and financial resources.4) owing to the discrepancy in elevation between colliery underworkings and the coal seam is little; The head of liquid of drilling fluid is not enough to eyelet is formed effective support during drilling well, well takes place during the drilling construction easily collapse, and not only causes lock of tool drilling; And can block the extraction passage, be unfavorable for gas pumping.
Summary of the invention
The objective of the invention is to solve the above-mentioned technical problem that the method for existing extraction coal-bed gas exists, and a kind of method of the extraction coal-bed gas that the 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 that adopts to be: a kind of method of extraction coal-bed gas; It at first opens up at least one butt hole drill site in the preparatory working under coal mine; From the opposite bore of this butt hole drill site, in opposite bore, be lowered to the solid hole of seamless steel sleeve Guan Bingyong high-mark cement to a 30～50m of target coal seam construction; At the far-end in design extraction zone, open up a ground drill site then, to down-hole opposite bore direction, bore the horizontal orientation master and prop up the hole, the butt joint of horizontal orientation master Zhi Kongyu down-hole opposite bore along the target coal seam construction level is directed; Then seal the aperture, ground, the aperture by-pass valve control is installed on the seamless steel sleeve pipe tube head of down-hole opposite bore, by-pass valve control is connected with coal mine gas extraction pipe network, utilizes the gas discharge in mine pump to carry out gas pumping.
The present invention props up on the hole said horizontal orientation master, and a plurality of horizontal orientation branch holes can also be set, with the contact area in further increase extraction hole and coal seam.
The upstream or downstream of then can constructing when preparatory working is below or above target coal seam under said coal mine boring.
Preparatory working can also be substituted by development work under the said coal mine.
Because the present invention adopted technique scheme, the advantage of ground level directed drilling pumping method and coal mine down-hole drilling pumping method is combined, remedied these two kinds of gas pumping methods inferior position separately.Therefore, compare with background technology, the present invention has the advantage that can improve extraction coal mine gas efficient.
Description of drawings
Fig. 1 is the sketch map of first embodiment of the invention;
Fig. 2 is the sketch map of second embodiment of the invention;
Fig. 3 is the sketch map of third embodiment of the invention;
Fig. 4 is the I among Fig. 1, Fig. 2 and Fig. 3---the I sectional drawing;
Fig. 5 is the II among Fig. 1, Fig. 2 and Fig. 3---the II sectional drawing;
Fig. 6 is the III among Fig. 1, Fig. 2 and Fig. 3---the III sectional drawing.
Among the 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 zone, 8-ground drill site; 9-horizontal orientation master props up the hole, 10-docking point, 11-horizontal orientation branched hole.
As shown in Figure 1; The method of a kind of extraction coal-bed gas in the present embodiment; It at first opens up a butt hole drill site 2 in the preparatory working 1 under coal mine; From the opposite bore 4 of this butt hole drill site, in opposite bore 4, be lowered to seamless steel sleeve pipe 5 also with high-mark cement 6 solid holes to a 30～50m of target coal seam 3 constructions; At the far-end in design extraction zone 7, open up a ground drill site 8 then, to down-hole opposite bore 4 directions, bore the horizontal orientation master and prop up hole 9 along target coal seam 3 construction levels are directed, the horizontal orientation master props up hole 9 and docks with down-hole opposite bore 4 through docking point 10; Then seal the aperture, ground, the aperture by-pass valve control is installed on seamless steel sleeve pipe 5 tube heads of down-hole opposite bore, by-pass valve control is connected with coal mine gas extraction pipe network, utilizes the gas discharge in mine pump to carry out gas pumping.In addition, prop up on the hole 9, a plurality of horizontal orientation branch holes 11 can also be set, with the contact area of further increase extraction hole and coal seam (gas-bearing reservoir of gas) the horizontal orientation master.
The upstream or downstream of then can constructing when preparatory working 1 is below or above target coal seam 3 under above-mentioned coal mine boring.
Preparatory working 1 can also be substituted by development work under the above-mentioned coal mine.
As shown in Figure 2; The method of a kind of extraction coal-bed gas in the present embodiment; It at first opens up two butt hole drill sites 2 in the preparatory working 1 under coal mine;, in opposite bore 4, be lowered to seamless steel sleeve pipe 5 and consolidate holes to construct the respectively opposite bore 4 of a 30～50m of target coal seam 3 from two butt hole drill sites with high-mark cement 6; At the far-end in design extraction zone 7, open up a ground drill site 8 then, to down-hole opposite bore 4 directions, prop up hole 9 along two horizontal directional drill horizontal orientation masters of target coal seam 3 constructions, the horizontal orientation master props up hole 9 and docks with down-hole opposite bore 4 through docking point 10; Then seal the aperture, ground, the aperture by-pass valve control is installed on seamless steel sleeve pipe 5 tube heads of two opposite bores in down-hole, by-pass valve control is connected with coal mine gas extraction pipe network, utilizes the gas discharge in mine pump to carry out gas pumping.In addition, prop up on the hole 9, a plurality of horizontal orientation branch holes 11 can also be set, with the contact area of further increase extraction hole and coal seam (gas-bearing reservoir of gas) two horizontal orientation masters.
The upstream or downstream of then can constructing when preparatory working 1 is below or above target coal seam 3 under above-mentioned coal mine boring.
Preparatory working 1 can also be substituted by development work under the above-mentioned coal mine.
As shown in Figure 3; The method of a kind of extraction coal-bed gas in the present embodiment; It at first opens up three butt hole drill sites 2 in the preparatory working 1 under coal mine;, in opposite bore 4, be lowered to seamless steel sleeve pipe 5 and consolidate holes to construct the respectively opposite bore 4 of a 30～50m of target coal seam 3 from three butt hole drill sites with high-mark cement 6; At the far-end in design extraction zone 7, open up a ground drill site 8 then, to down-hole opposite bore 4 directions, prop up hole 9 along three horizontal directional drill horizontal orientation masters of target coal seam 3 constructions, the horizontal orientation master props up hole 9 and docks with down-hole opposite bore 4 through docking point 10; Then seal the aperture, ground, the aperture by-pass valve control is installed on seamless steel sleeve pipe 5 tube heads of two opposite bores in down-hole, by-pass valve control is connected with coal mine gas extraction pipe network, utilizes the gas discharge in mine pump to carry out gas pumping.In addition, prop up on the hole 9, a plurality of horizontal orientation branch holes 11 can also be set, with the contact area of further increase extraction hole and coal seam (gas-bearing reservoir of gas) three horizontal orientation masters.
The upstream or downstream of then can constructing when preparatory working 1 is below or above target coal seam 3 under above-mentioned coal mine boring.
Preparatory working 1 can also be substituted by development work under the above-mentioned coal mine.
Claims (4)
1. the method for an extraction coal-bed gas; It is characterized in that: at first under coal mine, open up at least one butt hole drill site (2) in the preparatory working (1); From the opposite bore (4) of this butt hole drill site, in opposite bore, be lowered to seamless steel sleeve pipe (5) also with the solid hole of high-mark cement (6) to a 30～50m of target coal seam (3) construction; At the far-end in design extraction zone (7), open up a ground drill site (8) then, to down-hole opposite bore direction, bore the horizontal orientation master and prop up hole (9), the butt joint of horizontal orientation master Zhi Kongyu down-hole opposite bore along the target coal seam construction level is directed; Then seal the aperture, ground, the aperture by-pass valve control is installed on seamless steel sleeve pipe (5) tube head of down-hole opposite bore, by-pass valve control is connected with coal mine gas extraction pipe network, utilizes the gas discharge in mine pump to carry out gas pumping.
2. the method for a kind of extraction coal-bed gas according to claim 1 is characterized in that: prop up on the hole (9) said horizontal orientation master, a plurality of horizontal orientation branch holes (11) can also be set, with the contact area in further increase extraction hole and coal seam.
3. the method for a kind of extraction coal-bed gas according to claim 1 is characterized in that: the upstream or downstream of then can constructing when preparatory working is below or above target coal seam under said coal mine boring.
4. according to the method for claim 1 or 3 described a kind of extraction coal-bed gas, it is characterized in that: preparatory working can also be substituted by development work under the said coal mine.
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103437705A (en) * | 2013-08-19 | 2013-12-11 | 河南理工大学 | Directional and quick hole-forming device for mining-coal bed gas extraction multi-branch holes |
| CN104234738A (en) * | 2014-07-21 | 2014-12-24 | 河南理工大学 | Low-permeability coal bed multi-branch directional drilling seam cutting 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 |
| CN104819008A (en) * | 2015-04-17 | 2015-08-05 | 陕西福瑞德石油科技有限公司 | Efficient extraction method of coal seam gas |
| CN105257333A (en) * | 2015-05-30 | 2016-01-20 | 山西晋城无烟煤矿业集团有限责任公司 | Kilometer rig concentrated stripe type drainage method |
| 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 |
| CN107420126A (en) * | 2017-07-26 | 2017-12-01 | 柴兆喜 | Pressure circulation mine gas extraction system |
| CN108223004A (en) * | 2018-01-05 | 2018-06-29 | 中煤科工集团重庆研究院有限公司 | The method of two-way stereo staggered drilling collaboration directional long borehole joint mash gas extraction |
| 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 |
| CN110953015A (en) * | 2019-12-25 | 2020-04-03 | 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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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN103437705A (en) * | 2013-08-19 | 2013-12-11 | 河南理工大学 | Directional and quick hole-forming device for mining-coal bed gas extraction multi-branch holes |
| CN104234738A (en) * | 2014-07-21 | 2014-12-24 | 河南理工大学 | Low-permeability coal bed multi-branch directional drilling seam cutting 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 |
| CN104819008A (en) * | 2015-04-17 | 2015-08-05 | 陕西福瑞德石油科技有限公司 | Efficient extraction method of coal seam gas |
| CN105257333A (en) * | 2015-05-30 | 2016-01-20 | 山西晋城无烟煤矿业集团有限责任公司 | Kilometer rig concentrated stripe type drainage method |
| CN107420126B (en) * | 2017-07-26 | 2024-03-29 | 柴兆喜 | Pressure equalizing circulation mine gas extraction system |
| CN107420126A (en) * | 2017-07-26 | 2017-12-01 | 柴兆喜 | Pressure 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 |
| CN108223004A (en) * | 2018-01-05 | 2018-06-29 | 中煤科工集团重庆研究院有限公司 | The method of two-way stereo staggered drilling collaboration directional long borehole joint mash gas extraction |
| 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 |
| CN110953015A (en) * | 2019-12-25 | 2020-04-03 | 太原理工大学 | Soft low-permeability coal seam long-drill-hole directional segmented fracturing efficient gas extraction method |
| 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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