CN104329113A - Gas drainage method by pressure relief of coal bed bottom plate through ground drilling and loosening blasting - Google Patents

Gas drainage method by pressure relief of coal bed bottom plate through ground drilling and loosening blasting Download PDF

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Publication number
CN104329113A
CN104329113A CN201410446247.6A CN201410446247A CN104329113A CN 104329113 A CN104329113 A CN 104329113A CN 201410446247 A CN201410446247 A CN 201410446247A CN 104329113 A CN104329113 A CN 104329113A
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China
Prior art keywords
drilling
ground
ground drilling
horizontal
explosive
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CN201410446247.6A
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Chinese (zh)
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CN104329113B (en
Inventor
穆朝民
石必明
伍清
齐娟
张文清
胡祖祥
高光发
程建圣
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Anhui University of Science and Technology
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Anhui University of Science and Technology
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Priority to CN201410446247.6A priority Critical patent/CN104329113B/en
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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21FSAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
    • E21F7/00Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/25Methods for stimulating production
    • E21B43/26Methods for stimulating production by forming crevices or fractures
    • E21B43/263Methods for stimulating production by forming crevices or fractures using explosives

Abstract

The invention provides a gas drainage method by pressure relief of a coal bed bottom plate through ground drilling and loosening blasting. The method comprises the following steps of drilling a plurality of ground drilling wells to the part 2-3cm below a bottom plate of a coal bed working surface on the covering ground of the working surface along the advancing direction of the working surface; adopting an L-shaped drilling technology, and drilling horizontal drilling holes in the bottom part of the ground drilling wells along the driving direction of the working surface, so as to communicate every two ground drilling wells; filling explosives into the horizontal drilling holes, enabling a detonating fuse to penetrate through the adjacent explosives, filling water into the ground drilling wells, and sealing the holes; detonating the explosives, enabling the explosives to blast and loosen the coal bed, and generating a large amount of cracks, so as to reach the purposes of relieving pressure and increasing permeability; sucking the water out of the ground drilling wells and the horizontal drilling holes, connecting a gas drainage pipe into the corresponding ground drilling well, and draining the gas out of the coal bed. The method has the advantages that the ground drilling wells are utilized, a rock layer at the bottom plate of the working surface is blasted, and the gas in the coal bed is drained; the method has the advantages that the cost is low, the safety is high, the gas drainage procedure is simplified, and the like.

Description

A kind of method of surface drilling loosening blasting seat earth release mash gas extraction
Technical field
The present invention relates to colliery blasting technical field, be specifically related to a kind of method of surface drilling loosening blasting seat earth release mash gas extraction.
Background technology
The exploitation of high gassy and low permeability coal seam, usually with a difficult problem for a large amount of Gas, has a strong impact on and governs the safe working in colliery.Solve this difficult problem be at all take out coal-bed gas in advance, the method of Gas pre-drainage carries out boring Gas pre-drainage mainly through the gas pumping lane of down-hole to work plane coal seam, this kind of method is adopted to need to arrange two gas pumping tunnels in work plane seat earth rock stratum, also need if desired to arrange a gas pumping lane again in work plane Roof Rock Strata of Coal Seam, the method not only roadway layout is costly, expend time in length, and labour intensity is large, and is prone to accidents.
Summary of the invention
For solving the problems of the technologies described above, the invention provides a kind of method of surface drilling loosening blasting seat earth release mash gas extraction, loosening blasting can be carried out by the mode of ground drilling to work plane coal seam, the anti-reflection and then draining coal seam gas of release is carried out to low air permeability coal seam.
For achieving the above object, the present invention adopts following technical scheme:
A method for surface drilling loosening blasting seat earth release mash gas extraction, comprises the steps:
A () is covered earth's surface and is bored below multiple ground drilling to working face of coal seam base plate 2 ~ 3m place along advance of the face direction cutter on work plane;
B () utilizes " L shape " drilling technique, described in step (a), horizontal drilling is bored along advance of the face direction cutter in the bottom of ground drilling, and described horizontal drilling is communicated with adjacent described ground drilling;
C explosive is filled in horizontal drilling described in step (b) by (), and run through adjacent described explosive with detonating fuse;
D () carries out sealing of hole to water filling in ground drilling described in step (a);
Explosive described in (e) detonation step (c), described explosive blasting loosens described coal seam, produces a large amount of crack;
F water in described ground drilling and described horizontal drilling is extracted out by (), gas pumping pipe accesses described ground drilling, the gas in coal seam described in extraction.
The method of surface drilling loosening blasting seat earth release mash gas extraction of the present invention, wherein, the surface drilling spacing described in step (a) is 200 ~ 300m.
The method of surface drilling loosening blasting seat earth release mash gas extraction of the present invention, wherein, the diameter of ground drilling described in step (a) is 75 ~ 145mm.
The method of surface drilling loosening blasting seat earth release mash gas extraction of the present invention, wherein, the horizontal drilling diameter described in step (b) is identical with ground drilling diameter.
The method of surface drilling loosening blasting seat earth release mash gas extraction of the present invention, wherein, explosive described in step (c) is aqueous gels or emulsion.
The method of surface drilling loosening blasting seat earth release mash gas extraction of the present invention, wherein, the ground drilling water filling sealing of hole described in step (d) hangs down height more than 300m to or water column concordant with ground.
The advantages such as the method for the present invention and existing Gas pre-drainage contrasts, and decrease the layout of extraction borehole without the need to tunneling gas extraction lane, have cost low, the duration is short, the amount of labour is light, efficient, safety, also simplifies gas pumping process simultaneously; Surface drilling spacing described in step (a) is 200 ~ 300m, is conducive to taking into account the grazing of lateral aperture and the quantity of ground drilling; Ground drilling water filling sealing of hole described in step (d) to or water column concordant with ground hangs down height more than 300m, is unlikely to leak with this explode sealing of hole pressure and gas.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the method for surface drilling loosening blasting seat earth release mash gas extraction of the present invention;
Fig. 2 is the effect schematic diagram of the method for surface drilling loosening blasting seat earth release mash gas extraction of the present invention.
1-ground drilling; 2-water column; 3-rock stratum; 4-coal seam; 5-horizontal drilling; 6-detonator; 7-detonating fuse; 8-aqueous gels; 9-rubble; 10-crack; 11-ground.
Be described further below in conjunction with the method for specific embodiments and the drawings to surface drilling loosening blasting seat earth release mash gas extraction of the present invention.
Detailed description of the invention
Embodiment 1
The method of a kind of surface drilling loosening blasting of the present embodiment seat earth release mash gas extraction, comprises the following steps:
(a) cover on work plane earth's surface along advance of the face direction every 200m cut a hole drill diameter be 75mm ground drilling 1 to coal seam 4 floor undulation below 2m place;
B () utilizes " L shape " drilling technique, cutting a hole drill diameter in the bottom of ground drilling 1 along advance of the face direction is 75mm horizontal drilling 5, and horizontal drilling 5 is communicated with adjacent ground drilling 1;
C explosive 8 is filled in horizontal drilling 5 described in step (b) by (), and run through adjacent explosive 8 with detonating fuse 7, and explosive 8 is aqueous gels;
D () is to water filling sealing of hole in ground drilling 1 in step (b) to concordant with ground 11;
E () uses explosive 8 in detonator 6 detonation step (c), explosive 8 explodes and loosens coal seam 4, produces a large amount of crack 10;
F water in ground drilling 1 and horizontal drilling 5 is extracted out by (), gas pumping pipe access ground drilling 1, the gas in extraction coal seam 4.
Embodiment 2
The method of a kind of surface drilling loosening blasting of the present embodiment seat earth release mash gas extraction, comprises the following steps:
(a) cover on work plane earth's surface along advance of the face direction every 300m cut a hole drill diameter be 145mm ground drilling 1 to coal seam 4 floor undulation below 3m place;
B () utilizes " L shape " drilling technique, cutting a hole drill diameter in the bottom of ground drilling 1 along advance of the face direction is 145mm horizontal drilling 5, and horizontal drilling 5 is communicated with adjacent ground drilling 1;
C explosive 8 is filled in horizontal drilling 5 described in step (b) by (), and run through adjacent explosive 8 with detonating fuse 7, and explosive 8 is emulsion;
D () hangs down height more than 300m to water filling sealing of hole in ground drilling 1 in step (b) to water column 2;
E () uses explosive 8 in detonator 6 detonation step (c), explosive 8 explodes and loosens coal seam 4, produces a large amount of crack 10;
F water in ground drilling 1 and horizontal drilling 5 is extracted out by (), gas pumping pipe access ground drilling 1, the gas in extraction coal seam 4.
In blasting process, want the safe distance of retained personnel and plant equipment distance ground drilling 30m, prevent the water in blasting process, slag particle from destroying equipment or hurting personnel.
Above-described embodiment is only be described the preferred embodiment of the present invention; not scope of the present invention is limited; under not departing from the present invention and designing the prerequisite of spirit; the various distortion that those of ordinary skill in the art make technical scheme of the present invention and improvement, all should fall in protection domain that claims of the present invention determines.

Claims (6)

1. a method for surface drilling loosening blasting seat earth release mash gas extraction, is characterized in that, comprise the steps:
A () is covered earth's surface and is bored below multiple ground drilling (1) to coal seam (4) floor undulation 2 ~ 3m place along advance of the face direction cutter on work plane;
B () utilizes " L shape " drilling technique, described in step (a), horizontal drilling (5) is bored along advance of the face direction cutter in the bottom of ground drilling (1), and described horizontal drilling (5) is communicated with adjacent described ground drilling (1);
C explosive (8) is filled in horizontal drilling described in step (b) (5) by (), and run through adjacent described explosive (8) with detonating fuse (7);
D () carries out sealing of hole to water filling in ground drilling described in step (a) (1);
Explosive described in (e) detonation step (c) (8), coal seam (4) described in described explosive (8) in-place blasting out, produce a large amount of crack (10);
F water in described ground drilling (1) and described horizontal drilling (5) is extracted out by (), gas pumping pipe accesses described ground drilling (1), the gas in coal seam described in extraction (4).
2. the method for surface drilling loosening blasting seat earth release mash gas extraction according to claim 1, is characterized in that: ground drilling (1) spacing described in step (a) is 200 ~ 300m.
3. the method for surface drilling loosening blasting seat earth release mash gas extraction according to claim 2, is characterized in that: ground drilling described in step (a) (1) diameter is 75 ~ 145mm.
4. the method for surface drilling loosening blasting seat earth release mash gas extraction according to claim 3, is characterized in that: horizontal drilling described in step (b) (5) diameter is identical with described ground drilling (1) diameter.
5. the method for surface drilling loosening blasting seat earth release mash gas extraction according to claim 4, is characterized in that: explosive described in step (c) (8) is aqueous gels or emulsion.
6. the method for surface drilling loosening blasting seat earth release mash gas extraction according to claim 1-5 any one, is characterized in that: ground drilling (1) the water filling sealing of hole described in step (d) hangs down height more than 300m to or water column (2) concordant with ground (11).
CN201410446247.6A 2014-09-03 2014-09-03 A kind of method of surface drilling standing seat earth release mash gas extraction Expired - Fee Related CN104329113B (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106121644A (en) * 2016-06-17 2016-11-16 中国矿业大学 Water-filling pressure-bearing unloading pressure by blasting based on drilling in coal and rock plane crosslinking cellular structure and supporting reinforcement
CN106894816A (en) * 2017-02-23 2017-06-27 中国矿业大学 Far field key stratum based on set square structural model cuts top release shield lane method
CN106948860A (en) * 2017-05-27 2017-07-14 中煤科工集团重庆研究院有限公司 The method for cooperateing with progressive draining coal seam gas with directional drilling based on U-shaped well
CN107120137A (en) * 2017-07-12 2017-09-01 安徽理工大学 A kind of coal roadway tunneling is along seat earth Deephole pre-splitting blasting pumping method
CN108708722A (en) * 2018-03-27 2018-10-26 山东科技大学 A method of being used for the efficient prevention bump of low air permeability coal seam

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CN1776196B (en) * 1998-11-20 2011-08-10 Cdx天然气有限公司 Method and system for accessing subterranean deposits from the surface
CN102418549A (en) * 2011-08-15 2012-04-18 河南理工大学 Technical method for extracting coalbed methane from constructed coal development area
RU2453705C1 (en) * 2011-01-13 2012-06-20 Учреждение Российской академии наук Институт проблем комплексного освоения недр Российской академии наук (УРАН ИПКОН РАН) Method for degassing of coal beds
CN103195466A (en) * 2013-03-30 2013-07-10 重庆大学 Directional water pressure blasting method for improving coal bed gas permeability

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CN1776196B (en) * 1998-11-20 2011-08-10 Cdx天然气有限公司 Method and system for accessing subterranean deposits from the surface
CN101979835A (en) * 2010-09-21 2011-02-23 安徽省煤田地质局第一勘探队 Method for preventing coal and gas burst by drill communicated coal mining exhaust
RU2453705C1 (en) * 2011-01-13 2012-06-20 Учреждение Российской академии наук Институт проблем комплексного освоения недр Российской академии наук (УРАН ИПКОН РАН) Method for degassing of coal beds
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CN103195466A (en) * 2013-03-30 2013-07-10 重庆大学 Directional water pressure blasting method for improving coal bed gas permeability

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106121644A (en) * 2016-06-17 2016-11-16 中国矿业大学 Water-filling pressure-bearing unloading pressure by blasting based on drilling in coal and rock plane crosslinking cellular structure and supporting reinforcement
CN106121644B (en) * 2016-06-17 2018-05-29 中国矿业大学 The water-filling pressure-bearing unloading pressure by blasting of cellular structure and supporting reinforcement are crosslinked based on drilling in coal and rock plane
CN106894816A (en) * 2017-02-23 2017-06-27 中国矿业大学 Far field key stratum based on set square structural model cuts top release shield lane method
CN106948860A (en) * 2017-05-27 2017-07-14 中煤科工集团重庆研究院有限公司 The method for cooperateing with progressive draining coal seam gas with directional drilling based on U-shaped well
CN107120137A (en) * 2017-07-12 2017-09-01 安徽理工大学 A kind of coal roadway tunneling is along seat earth Deephole pre-splitting blasting pumping method
CN107120137B (en) * 2017-07-12 2019-03-15 安徽理工大学 A kind of coal roadway tunneling is along seat earth Deephole pre-splitting blasting pumping method
CN108708722A (en) * 2018-03-27 2018-10-26 山东科技大学 A method of being used for the efficient prevention bump of low air permeability coal seam

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