CN105003294A - Method for coal uncovering in cross cut by hydrothermal coupling based coal fracturing - Google Patents

Method for coal uncovering in cross cut by hydrothermal coupling based coal fracturing Download PDF

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CN105003294A
CN105003294A CN201510455865.1A CN201510455865A CN105003294A CN 105003294 A CN105003294 A CN 105003294A CN 201510455865 A CN201510455865 A CN 201510455865A CN 105003294 A CN105003294 A CN 105003294A
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pressure break
coal
hole
fracturing
branch
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CN105003294B (en
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倪冠华
程卫民
王刚
刘震
于岩斌
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Shandong University of Science and Technology
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Shandong University of Science and Technology
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Abstract

The invention discloses a method for coal uncovering in a cross cut by hydrothermal coupling based coal fracturing. The method includes: sequentially constructing a main fracturing hole, branched fracturing holes and guide holes in a rock stratum roadway section, wherein the main fracturing hole is formed in the center of an equilateral triangle, hole starting positions of the branched fracturing holes are arranged at three vertexes of the equilateral triangle while hole finishing positions of the same meet at a central line of the equilateral triangle, the guide holes are positioned on a circle taking the main fracturing hole as a circle center and with radius of 5-15m, and herein fracturing equipment comprises water injection equipment composed of an intelligent water tank and a fracturing pump and a powder injector; injecting quicklime powder in the powder injector into the main fracturing hole and the branched fracturing holes through underground air pressure; hydraulically fracturing the main fracturing hole through the water injection equipment, wherein the quicklime powder carried by high-pressure water enters fractures and thermally reacts with water to generate a lot of heat to realize coal uncovering in the cross cut through hydrothermal coupling based coal fracturing. By the method, ground stress and gas pressure of pre-uncovering coal seams are lowered, safety effect is remarkable, and cost is low.

Description

A kind of based on hydrothermal reaction coupling pressure break coal body coal uncovering method
Technical field
The present invention relates to a kind of based on hydrothermal reaction coupling pressure break coal body coal uncovering method, belong to cross cut coal uncovering in coal mine underground technical field, be particularly useful in the operation of deep high methane projecting coal bed middle high risk stone door punching coal.
Background technology
China Mine Geological complicated condition, high gas layer accounts for 50%-70%, and high gassy and low permeability coal seam account for wherein about 70%.China's high gassy and low permeability coal seam bearing features is micropore property, low-permeability and high adsorption, cause in stone door punching coal process first often along with a large amount of Gas, particularly along with the high-efficiency intensifying of coal production and the increase of mining depth, gas emission and coal seam geostatic stress increasing, cause the threat of coal and gas prominent during stone door punching coal more and more serious.Therefore, colliery often needed to carry out regional gas control operation before the stone door punching coal of coal seam, will take off coal-bed gas pressure in advance and the abundant release of geostatic stress is anti-reflection.
For many years, China's coal-mine is studying the outstanding of coal and non-coal when how to prevent stone door punching coal always, try hard to eliminate the outburst danger of stone door punching coal, although take steel frame, grouting and reinforcing, in advance take out coal-bed gas, fracturing, hydraulic flushing in hole even coal take off the series of measures such as rock, but stone door punching coal protrusion phenomenon still happens occasionally, even occur that defer time does not wait outstanding, cause the heavy losses of coal mining enterprise's property.Mainly because cracks in coal seam expansion is insufficient before traditional stone door punching coal technology, there is no the Fracture Networks of feasible region.And, conventional hydraulic pressure break stone door punching coal technology implements the passage that there is shutoff Gas Flow of rear moisture, produce the effect suppressing desorption of mash gas, diffusion and infiltration, cause the coal seam before stone door punching coal not have abundant release anti-reflection, geostatic stress and gas pressure is high, gas bearing capacity is large, dangerous high.Therefore, in order to solve existing stone door punching coal technological deficiency, be badly in need of a kind of novel stone door punching coal technical method, to meet colliery scene stone door punching coal requirements of one's work.
In conjunction with and draw the advantage of existing fracturing, using for reference heats up promotes the thinking of desorption of mash gas, to increase after pressure break desorption of mash gas amount in pre-exposed coal layer, reduce pressure break after the plugging action of moisture, reasonably boring layout is utilized to make pre-exposed coal layer produce region Fracture Networks, reduce geostatic stress, gas pressure and the gas bearing capacity before the exposed coal of coal seam, formed based on hydrothermal reaction coupling pressure break coal body coal uncovering method.
Summary of the invention
Technical problem: the object of the invention is the weak point for high gassy and low permeability coal seam stone door punching coal, there is provided a kind of pressure break influence area large, desorption of mash gas amount is large, and gas pumping successful, success rate are high, cost is low, safety is high based on hydrothermal reaction coupling pressure break coal body coal uncovering method.
Technical scheme:
The present invention is based on hydrothermal reaction coupling pressure break coal body coal uncovering method, it is characterized in that comprising the following steps:
A. to construct successively main pressure break hole and three branch's pressure break holes at rock stratum drift section, main pressure break hole is arranged in an equilateral triangle center position, the position of opening in three branch's pressure break holes is arranged in this equilateral leg-of-mutton three summits place, the borehole bottom location in three branch's pressure break holes is met at this equilateral triangle center line place, being formed with equilateral triangle is the end, with the positive triangular pyramid that branch's pressure break hole is seamed edge, make main pressure break hole, three branch's pressure break holes through in coal seam, the perforate spacing in main pressure break hole and branch's pressure break hole is 2 ~ 3m.
B. at four bullports of constructing apart from 5 ~ 15m position, main pressure break hole, make four bullports be in main pressure break hole for the center of circle, radius is on the circle of 5 ~ 15m;
C. connect fracturing unit in aperture, main pressure break hole, described fracturing unit comprises the water injection equipment that is made up of intelligent water tank, fracturing pump and note powder device forms.The outlet pipe of water injection equipment and the flour extraction pipe of note powder device are linked together by threeway, and the outlet of threeway is connected with pressure break pipe through high-pressure rubber pipe, and the outlet pipe of water injection equipment, the flour extraction pipe of note powder device are respectively equipped with one way valve;
D. conventional method for sealing is adopted to carry out borehole sealing to main pressure break hole, branch's pressure break hole and bullport successively;
E. in note powder device, add a certain amount of calcium lime powder, by down-hole blast, the calcium lime powder in note powder device is injected main pressure break hole, when the whole powder delivery in all branch's pressure break holes, stop note powder;
F. fracturing pump is opened, carry out fracturing by water injection equipment to main pressure break hole, around main pressure break hole and branch's pressure break hole, produce crack, calcium lime powder enters crack under the carrying of water under high pressure, calcium lime powder and moisture generation thermal response generate a large amount of heat simultaneously, realize hydrothermal reaction coupling pressure break coal body;
G. repeat step e, f, when four bullports all occur that water flows out, stop hydrothermal reaction coupling pressure break, remove fracturing unit, main pressure break hole, branch's pressure break hole and bullport are linked gas pumping pipe network, carries out gas pumping;
H. when coal seam gas-bearing capacity is less than 8m 3during/t, stop gas pumping, conveniently method for uncovering coal opens coal seam.
Beneficial effect: owing to have employed technique scheme, solve existing stone door punching coal technological deficiency, achieve coal seam water thermal coupling pressure break coal body safe coal-openning, facilitate the cranny development of pre-exposed coal layer, expansion and through by hydrothermal reaction coupling pressure break, pressure break influence area increases; Temperature raises the desorption of mash gas, the increase pressure break after gas desorption quantity that facilitate high adsorption in pre-exposed coal layer; Moisture and calcium lime powder react, and moisture reduces, the plugging action of moisture after minimizing pressure break; Reduce the geostatic stress of pre-exposed coal layer, gas pressure and gas bearing capacity, by implementing hydrothermal reaction coupling pressure break coal body coal uncovering method, cost is low, and security impact is remarkable, meets the requirements of one's work such as colliery scene deep coal body stone door punching coal.
Accompanying drawing explanation
Fig. 1 is that one of the present invention is based on hydrothermal reaction coupling pressure break coal body coal uncovering method borehole pattern.
Fig. 2 is that one of the present invention is based on hydrothermal reaction coupling pressure break coal body coal uncovering method embodiment schematic diagram.
In figure: 1-drift section, 2-main pressure break hole, 3-branch pressure break hole, 4-bullport, 5-intelligent water tank, 6-fracturing pump, 7-high-pressure rubber pipe, 8-1-one way valve, 8-2-one way valve, 9-valve, 10-threeway, 11-pressure break pipe, 12-note powder device, 13-calcium lime powder, 14-rock stratum, 15-coal seam.
Detailed description of the invention:
Below in conjunction with accompanying drawing, the specific embodiment of the invention is further described:
Shown in Fig. 1 and Fig. 2, a kind of based on hydrothermal reaction coupling pressure break coal body coal uncovering method: first, to construct successively main pressure break hole 2 and three branch's pressure break holes 3 at rock stratum 14 drift section 1, main pressure break hole 2 is arranged in an equilateral triangle center position, the position of opening in three branch's pressure break holes 3 is arranged in this equilateral leg-of-mutton three summits place, the borehole bottom location in three branch's pressure break holes 3 is met at this equilateral triangle center line place, being formed with equilateral triangle is the end, with the positive triangular pyramid that branch's pressure break hole 3 is seamed edge, make main pressure break hole 2, three branch's pressure break holes 3 are through in coal seam 15, main pressure break hole 2 is 2 ~ 3m with the perforate spacing in branch's pressure break hole 3, construct in the 5 ~ 15m position apart from main pressure break hole 2 four bullports 4, make four bullports 4 be in main pressure break hole 2 for the center of circle, radius is on the circle of 5 ~ 15m, connect fracturing unit in aperture, main pressure break hole 2, described fracturing unit comprises the water injection equipment that is made up of intelligent water tank 5, fracturing pump 6 and note powder device 12 forms.The outlet pipe of water injection equipment and the flour extraction pipe of note powder device are linked together by threeway 10, and the outlet of threeway 10 is connected with pressure break pipe 11 through high-pressure rubber pipe 7, and the outlet pipe of water injection equipment, the flour extraction pipe of note powder device 12 are respectively equipped with one way valve 8-1 and one way valve 8-2; Conventional method for sealing is adopted to carry out borehole sealing to main pressure break hole 2, branch's pressure break hole 3 and bullport 4 successively; In note powder device 12, add a certain amount of calcium lime powder 13, by down-hole blast, the calcium lime powder 13 in note powder device 12 is injected main pressure break hole 2, when all branch's pressure break hole 3 whole powder delivery, stop note powder; Open fracturing pump 6, by water injection equipment, fracturing is carried out to main pressure break hole 2, crack is produced around main pressure break hole 2 and branch's pressure break hole 3, calcium lime powder 13 enters crack under the carrying of water under high pressure, calcium lime powder 13 and moisture generation thermal response generate a large amount of heat simultaneously, realize hydrothermal reaction coupling pressure break coal body; When four bullports 4 all occur that water flows out, stop hydrothermal reaction coupling pressure break, remove fracturing unit, main pressure break hole 2, branch's pressure break hole 3 and bullport 4 are linked gas pumping pipe network, carries out gas pumping; When coal seam 15, gas bearing capacity is less than 8m 3during/t, stop gas pumping, conveniently method for uncovering coal opens coal seam 15.Facilitate the cranny development of pre-exposed coal layer, expansion and through by hydrothermal reaction coupling pressure break, pressure break influence area increases; Temperature raises the desorption of mash gas, the increase pressure break after gas desorption quantity that facilitate high adsorption in pre-exposed coal layer; Moisture and calcium lime powder react, and moisture reduces, the plugging action of moisture after minimizing pressure break; Reduce the geostatic stress of pre-exposed coal layer, gas pressure and gas bearing capacity, by implementing hydrothermal reaction coupling pressure break coal body coal uncovering method, cost is low, and security impact is remarkable, meets the requirements of one's work such as colliery scene deep coal body stone door punching coal.

Claims (2)

1., based on a hydrothermal reaction coupling pressure break coal body coal uncovering method, it is characterized in that comprising the following steps:
A. to construct successively main pressure break hole (2) and three branch's pressure break holes (3) at rock stratum (14) drift section (1), main pressure break hole (2) is arranged in an equilateral triangle center position, the position of opening of three branch's pressure break holes (3) is arranged in this equilateral leg-of-mutton three summits place, the borehole bottom location of three branch's pressure break holes (3) is met at this equilateral triangle center line place, make main pressure break hole (2), three branch's pressure break holes (3) are through in coal seam (15), main pressure break hole (2) is 2 ~ 3m with the perforate spacing in branch's pressure break hole (3),
B. perforate spacing is 2 ~ 3m; Construct four bullports (4), four bullports (4) are in main pressure break hole (2) for the center of circle, and radius is on the circle of 5 ~ 15m;
C. connect fracturing unit in main pressure break hole (2) aperture, described fracturing unit comprises the water injection equipment be made up of intelligent water tank (5), fracturing pump (6) and forms with note powder device (12).The outlet pipe of water injection equipment and the flour extraction pipe of note powder device are linked together by threeway (10), the outlet of threeway (10) is connected with pressure break pipe (11) through high-pressure rubber pipe (7), and the outlet pipe of water injection equipment, the flour extraction pipe of note powder device (12) are respectively equipped with one way valve (8-1) and one way valve (8-2);
D. conventional method for sealing is adopted to carry out borehole sealing to main pressure break hole (2), branch's pressure break hole (3) and bullport (4) successively;
E. in note powder device (12), a certain amount of calcium lime powder (13) is added, by down-hole blast, the calcium lime powder (13) noted in powder device (12) is injected main pressure break hole (2), when the whole powder delivery of all branch's pressure break holes (3), stop note powder;
F. fracturing pump (6) is opened, by water injection equipment, fracturing is carried out to main pressure break hole (2), crack is produced around main pressure break hole (2) and branch's pressure break hole (3), calcium lime powder (13) enters crack under the carrying of water under high pressure, calcium lime powder (13) and moisture generation thermal response generate a large amount of heat simultaneously, realize hydrothermal reaction coupling pressure break coal body;
G. step e, f is repeated, when four bullports (4) all occur that water flows out, stop hydrothermal reaction coupling pressure break, remove fracturing unit, main pressure break hole (2), branch's pressure break hole (3) and bullport (4) are linked gas pumping pipe network, carries out gas pumping;
H. when coal seam (15) gas bearing capacity is less than 8m 3during/t, stop gas pumping, conveniently method for uncovering coal opens coal seam (15).
2. according to claim 1 based on hydrothermal reaction coupling pressure break coal body coal uncovering method, it is characterized in that: pressure break pipe (11) is the seamless steel pipe of even tube wall layout aperture, hole diameter is 10mm, and seamless steel pipe diameter is 25mm, and seamless steel pipe total length is 30m.
CN201510455865.1A 2015-07-30 2015-07-30 One kind is based on hydrothermal reaction coupling pressure break coal body coal uncovering method Expired - Fee Related CN105003294B (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106014363A (en) * 2016-05-18 2016-10-12 中国矿业大学 Method for improving underground coal mine gas extraction efficiency
CN107842350A (en) * 2017-11-07 2018-03-27 河南理工大学 A kind of method that extraction rate is improved in high gas remainder quantity coal seam of underground coal mine
CN108708765A (en) * 2018-04-13 2018-10-26 山东科技大学 One kind strengthening acid fracturing coal uncovering method based on high temperature disturbance

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CN103195467A (en) * 2013-04-02 2013-07-10 重庆市能源投资集团科技有限责任公司 Hydraulic fracturing and grouting solidification combined rock cross-cut coal uncovering method

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US20070227732A1 (en) * 2006-03-28 2007-10-04 Schlumberger Technology Corporation Method of fracturing a coalbed gas reservoir
CN102182499A (en) * 2011-04-21 2011-09-14 中国矿业大学 Hydrofracturing-based method and equipment for diminishing dust and eliminating outburst of coal bed
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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106014363A (en) * 2016-05-18 2016-10-12 中国矿业大学 Method for improving underground coal mine gas extraction efficiency
CN106014363B (en) * 2016-05-18 2018-06-15 中国矿业大学 A kind of method for improving coal mine gas extraction efficiency
CN107842350A (en) * 2017-11-07 2018-03-27 河南理工大学 A kind of method that extraction rate is improved in high gas remainder quantity coal seam of underground coal mine
CN107842350B (en) * 2017-11-07 2019-08-02 河南理工大学 A kind of method that extraction rate is improved in the high gas remainder quantity coal seam of underground coal mine
CN108708765A (en) * 2018-04-13 2018-10-26 山东科技大学 One kind strengthening acid fracturing coal uncovering method based on high temperature disturbance
CN108708765B (en) * 2018-04-13 2019-09-06 山东科技大学 One kind strengthening acid fracturing coal uncovering method based on high temperature disturbance

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