CN103362540B - High gas layer pressure relief gas pumping mining method - Google Patents

High gas layer pressure relief gas pumping mining method Download PDF

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Publication number
CN103362540B
CN103362540B CN201310339793.5A CN201310339793A CN103362540B CN 103362540 B CN103362540 B CN 103362540B CN 201310339793 A CN201310339793 A CN 201310339793A CN 103362540 B CN103362540 B CN 103362540B
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China
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gas
draining
water
layer
bearing stratum
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CN201310339793.5A
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Chinese (zh)
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CN103362540A (en
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王海锋
王伟
程远平
王亮
李伟
王飞
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中国矿业大学
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Abstract

The projecting coal bed pressure relief gas pumping mining method of a kind of high methane, to construct multiple draining gas drainage borehole to water-bearing stratum from stone head, then sealing of hole is carried out, draining is carried out to water-bearing stratum, contiguous coal rock layer is made to produce movement and deformation, increase the gas permeability of water-bearing stratum bottom high gas layer, make contiguous coal rock layer produce new crack simultaneously, and form the migration pathway of high gas layer gas to draining gas drainage borehole; After water-bearing stratum draining terminates, draining gas drainage borehole is connected with extraction pipeline, starts to carry out pressure relief gas pumping mining to the high gas layer of bottom.Borehole engineering amount can be reduced in a large number, significantly improve coal bed gas extraction effect.Its method is simple, easy to operate, Be very effective.

Description

High gas layer pressure relief gas pumping mining method

Technical field

The present invention relates to a kind of pressure relief gas pumping mining method, the high gas layer pressure relief gas pumping mining method depositing water-bearing stratum is composed on especially a kind of top, coal seam that is applicable to.

Background technology

According to regulation, methods such as " controls coal and gas prominent regulation " and " gas pumping Tentative Measures up to standard ", for high gas layer and projecting coal bed, first need to carry out gas pumping before exploitation.Region gas pumping technology comprises protective coat extracted technology and takes out coal-bed gas technology two kinds in advance; the major measure of wherein taking out coal-bed gas in advance carries out gas pumping to high gas layer construction concordant boring and layer-through drilling; reduce coal seam gas-bearing capacity, eliminate its outburst hazard.

The roof position of a lot of highly gassy mine of China is all composed has aquifer.For preventing the generation of water inrush accident, before seam mining, needing to construct to aquifer the boring that discharges water, and then discharge water.Find in practice, by discharging water to water-bearing stratum, to not only eliminate work plane flood, and the gas permeability in coal seam also enlarges markedly, and can give off gas from boring, this illustrates in rock stratum, defines the crack passage that coal-bed gas pours in the boring that discharges water.

By analysis, after discharging water to roof aquifer, the gas permeability in coal seam increases, and coal-bed gas and boring conducting, its mechanism and protective coat extracted similar.After protective coat extracted, because strata movement, stress reduction, cranny development make protected seam obtain release antireflective effect, and form conducting crack in interlayer rock stratum.In like manner, water-bearing stratum just looks like topping, and the process that water-bearing stratum discharges water is equivalent to the process of up-protective layer exploitation.Water is composed to be existed in rock stratum and occupies certain space, the space reserved in rock stratum after discharging water, for the movement of lower coal rock stratum, distortion provide space.Some aquifer is very thick, thickly can reach tens of rice.Therefore the usefull space that aquifer stays after discharging water can make lower coal rock stratum obtain sufficient movement and deformation, stress reduction and gas permeability to be increased, for extraction coal seam pressure relief gas provides foundation.

Summary of the invention

Technical problem: the object of the invention is to compose for high gas layer top board to deposit aquifer condition, the high gas layer pressure relief gas pumping mining method providing a kind of method simple, easy to operate.

Technical scheme: high gas layer pressure relief gas pumping mining method of the present invention, comprises the steps:

A. first to construct above the water-bearing stratum that high gassy and low permeability coal seam is corresponding at least one stone head;

B. to construct multiple draining gas drainage borehole to water-bearing stratum from stone head, then sealing of hole is carried out to each draining gas drainage borehole, and install in aperture and control gate valve;

C. draining is carried out to water-bearing stratum, contiguous coal rock layer is made to produce movement and deformation, increase the gas permeability of water-bearing stratum bottom high gas layer, make contiguous coal rock layer produce new crack simultaneously, and form the migration pathway of high gas layer gas to draining gas drainage borehole;

D. after water-bearing stratum draining terminates, draining gas drainage borehole is connected with extraction pipeline, starts to carry out pressure relief gas pumping mining to the high gas layer of bottom.

The spacing of wells of the multiple draining gas drainage borehole of described construction is determined according to field condition.

Beneficial effect: owing to have employed technique scheme, one aspect of the present invention can increase gas permeability of coal seam, shortens the gas pumping time, does not need special construction coal mash gas pumping drilling on the other hand, can save a large amount of borehole engineering amount.Not only can improve gas permeability of coal seam, realize coal-bed gas release extraction, and do not need construction drill in coal seam, for composing the mine depositing water-bearing stratum in roof, can hole directly to aquifer construction drainage, then carrying out aquifer and discharge water.After discharging water formed space, can make the coal rock layer of bottom be moved distortion, gas permeability increase, coal seam pressure relief, produce new crack, and formed coal-bed gas to hole migration pathway.After discharging water, boring is directly connected with extraction pipeline, just can realizes the pressure relief gas pumping mining to underlying seam.This method can reduce borehole engineering amount in a large number, significantly improves coal bed gas extraction effect, has practicality widely.

Accompanying drawing explanation

Fig. 1 is top board water-bearing stratum pressure relief gas pumping mining method schematic diagram of the present invention.

In figure: 1-tunnel; 2-draining extraction borehole; 3-water-bearing stratum; 4-high gas layer; 5-crack; 6-other rock stratum.

Detailed description of the invention

Below in conjunction with accompanying drawing, one embodiment of the present of invention are further described:

High gas layer pressure relief gas pumping mining method of the present invention, first to construct in other rock stratum 6 above the water-bearing stratum 3 that high gassy and low permeability coal seam 4 is corresponding at least one stone head 1, determining according to on-site actual situations, is 2 stone heads 1 shown in Fig. 1; The different multiple draining gas drainage borehole 2 of angle of constructing in water-bearing stratum 3 from stone head 1, the spacing of wells of multiple draining gas drainage borehole 2 of constructing is determined according to field condition, is generally 20 ~ 40m; Then sealing of hole is carried out to each draining gas drainage borehole 2, and control gate valve is installed in aperture; Then drainage works is carried out to water-bearing stratum 3, the safety during guaranteeing working face mining, and note measuring the variation ofgas density situation in opening for drainage.Draining makes contiguous coal rock layer produce movement and deformation, increases the gas permeability of water-bearing stratum 3 bottom high gas layer 4, makes contiguous coal rock layer produce new crack 5 simultaneously, and forms the migration pathway of high gas layer 4 gas to draining gas drainage borehole 2; After water-bearing stratum 3 draining terminates, draining gas drainage borehole 2 is connected with extraction pipeline, starts to carry out pressure relief gas pumping mining to the high gas layer 4 of bottom.Need to measure pressure relief gas pumping mining in drainage procedure, for extraction work of reaching national standards provides basic data.When coal-bed gas pressure is down to 0.74MPa or gas bearing capacity is down to 8m 3during/below t, meet safely mining of coalbed condition and just can terminate gas pumping work.

Claims (1)

1. a high gas layer pressure relief gas pumping mining method, is characterized in that comprising the steps:
A. first at the water-bearing stratum (3) top at least one stone head of construction (1) that high gassy and low permeability coal seam (4) is corresponding;
B. from stone head (1) to the different multiple draining gas drainage boreholes (2) of water-bearing stratum (3) construction angle, the spacing of wells of multiple draining gas drainage borehole (2) of constructing is determined according to field condition, be generally 20 ~ 40m, then sealing of hole is carried out to each draining gas drainage borehole (2), and control gate valve is installed in aperture;
C. draining is carried out to water-bearing stratum (3), the safety during guaranteeing working face mining, and note measuring the variation ofgas density situation in opening for drainage; Draining makes contiguous coal rock layer produce movement and deformation, increase the gas permeability of water-bearing stratum (3) bottom high gas layer (4), make contiguous coal rock layer produce new crack (5) simultaneously, and form the migration pathway of high gas layer (4) gas to draining gas drainage borehole (2);
D. after water-bearing stratum (3) draining terminates, be connected by draining gas drainage borehole (2) with extraction pipeline, the high gas layer (4) started bottom carries out pressure relief gas pumping mining; Need to measure pressure relief gas pumping mining in drainage procedure, for extraction work of reaching national standards provides basic data, when coal-bed gas pressure is down to 0.74MPa or gas bearing capacity is down to 8m 3during/below t, meet safely mining of coalbed condition and just can terminate gas pumping work.
CN201310339793.5A 2013-08-07 2013-08-07 High gas layer pressure relief gas pumping mining method CN103362540B (en)

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CN103758560B (en) * 2014-01-14 2015-11-18 中国矿业大学 A kind of multiple topping packet zone mash gas harnessing method that goes forward one by one
CN104453983B (en) * 2014-11-15 2016-04-13 安徽理工大学 On a kind of half-edge coal seam layer-through drilling, anti-reflection and pumping method is let out in pressure
CN104533512A (en) * 2014-12-16 2015-04-22 中鼎国际工程有限责任公司 Construction method for preventing and treating gas outburst in coal roadway heading process
CN104533511A (en) * 2014-12-16 2015-04-22 中鼎国际工程有限责任公司 Construction method for preventing and treating coal and gas outburst in coal roadway heading process
CN104863629B (en) * 2015-06-11 2017-03-01 中国矿业大学 A kind of method taking out absciss layer gas and draining slip casting under overlying strata using combined drilling and counterboring
CN105422069B (en) * 2015-11-30 2017-08-25 中国矿业大学 A kind of high methane projecting coal bed " brill blanking " couples release anti-reflection method
CN105673065B (en) * 2016-01-12 2017-12-22 西安科技大学 A kind of projecting coal bed pressure relief gas pumping mining method of high methane
CN105804788A (en) * 2016-05-16 2016-07-27 中国矿业大学 Method for managing coalbed gas roadway
CN106014474B (en) * 2016-05-17 2018-06-01 陕西正通煤业有限责任公司 Meet underground release, leting speeper, gas drainage under suction three holes and use construction method
CN106869875B (en) * 2017-01-05 2019-06-07 中国神华能源股份有限公司 The method for exploiting two layers of coal bed gas
CN106837408B (en) * 2017-03-20 2018-08-21 中国矿业大学 A kind of coal seam stope advantage gas migration channel staged construction method
CN109026133B (en) * 2018-09-30 2020-02-18 四川华蓥山龙滩煤电有限责任公司 Extraction method of pressure-relief gas in mining separation zone of super-long working face

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