CN105003294B - One kind is based on hydrothermal reaction coupling pressure break coal body coal uncovering method - Google Patents

One kind is based on hydrothermal reaction coupling pressure break coal body coal uncovering method Download PDF

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Publication number
CN105003294B
CN105003294B CN201510455865.1A CN201510455865A CN105003294B CN 105003294 B CN105003294 B CN 105003294B CN 201510455865 A CN201510455865 A CN 201510455865A CN 105003294 B CN105003294 B CN 105003294B
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pressure break
coal
hole
branch
break hole
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CN105003294A (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

It is disclosed by the invention to be based on hydrothermal reaction coupling pressure break coal body coal uncovering method, constructed successively on the drift section of rock stratum first main pressure break hole, branch's pressure break hole and bullport, main pressure break hole is arranged in an equilateral triangle center position, the position of opening in branch's pressure break hole is arranged in three apexes of the equilateral triangle, its borehole bottom location is met in the equilateral triangle centerline, bullport is in using main pressure break hole as the center of circle, and radius is on 5~15m circle;Fracturing unit includes the water injection equipment being made up of intelligent water tank, fracturing pump and note powder device is constituted.The calcium lime powder noted in powder device is injected in main pressure break hole and branch's pressure break hole by underground blast;Hydraulic fracturing is carried out to main pressure break hole by water injection equipment, calcium lime powder enters crack under the carrying of water under high pressure, while thermal response, which occurs, for calcium lime powder and moisture generates substantial amounts of heat, realize hydrothermal reaction coupling pressure break coal body stone door punching coal.By based on hydrothermal reaction coupling pressure break coal body coal uncovering method, reducing the crustal stress and gas pressure in pre- exposed coal coal seam, significantly, cost is low for security impact.

Description

One kind is based on hydrothermal reaction coupling pressure break coal body coal uncovering method
Technical field
Hydrothermal reaction coupling pressure break coal body coal uncovering method is based on the present invention relates to one kind, belongs to cross cut coal uncovering in coal mine underground skill Art field, is particularly suitable for use in the projecting coal bed middle high risk stone door punching coal operation of deep high methane.
Background technology
China Mine Geological complicated condition, high gas layer accounts for 50%-70%, and high gassy and low permeability coal seam accounts for it In 70% or so.China's high gassy and low permeability coal seam bearing features are micropore property, low-permeability and high adsorption, are caused A large amount of Gas are usually associated with during stone door punching coal first, in particular with coal production high-efficiency intensifying and open The increase of depth is adopted, gas emission and coal seam crustal stress are increasing, the threat of coal and gas prominent when causing stone door punching coal It is increasingly severe.Therefore, colliery often needs to carry out regional gas control operation before the stone door punching coal of coal seam, by pre- exposed coal layer watt This pressure and the abundant release of crustal stress are anti-reflection.
For many years, China's coal-mine is studying the protrusion of coal and gas when how to prevent stone door punching coal always, tries hard to eliminate stone The outburst danger of door exposed coal, although take steel skeleton, grouting and reinforcing, take out coal-bed gas, hydraulic fracturing, hydraulic flushing in hole in advance even Coal takes off a series of measures such as rock, but stone door punching coal protrusion phenomenon still happens occasionally, or even the protrusion of extension time not etc. occurs, makes Into the heavy losses of coal mining enterprise's property.It is primarily due to cracks in coal seam extension before traditional stone door punching coal technology insufficient, It is not carried out the Fracture Networks in region.Moreover, the presence of moisture is blocked after the implementation of conventional hydraulic pressure break stone door punching coal technology The passage of Gas Flow, produces the effect for suppressing desorption of mash gas, diffusion and infiltration, causes the coal seam before stone door punching coal not filled Divide release anti-reflection, crustal stress and gas pressure are high, gas bearing capacity is big, dangerous high.Therefore, in order to solve existing stone door punching coal skill Art defect, is badly in need of a kind of new stone door punching coal technical method, to meet colliery scene stone door punching coal requirements of one's work.
With reference to and draw the advantage of existing hydraulic fracturing, use for reference pre- after the thinking that heating promotes desorption of mash gas, increase pressure break Desorption of mash gas amount in exposed coal layer, the plugging action for reducing moisture after pressure break, pre- exposed coal layer is produced using rational drilling arrangement Crustal stress, gas pressure and gas bearing capacity before region Fracture Networks, reduction coal seam exposed coal, form and are based on hydrothermal reaction coupling pressure break coal Body coal uncovering method.
The content of the invention
Technical problem:The purpose of the present invention be for high gassy and low permeability coal seam stone door punching coal weak point there is provided A kind of pressure break influence area is big, and desorption of mash gas amount is big, and gas pumping effect is obvious, success rate is high, cost is low, safe base In 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 characterised in that comprise the following steps:
A. constructed successively main pressure break hole and three branch's pressure break holes in rock stratum drift section, main pressure break hole is arranged in one etc. Side triangle center location, the position of opening in three branch's pressure break holes is arranged in three summits of the equilateral triangle Place, the borehole bottom location in three branch's pressure break holes is met in the equilateral triangle centerline, is formed using equilateral triangle the bottom of as, with Branch's pressure break hole is the positive triangular pyramid of seamed edge, makes main pressure break hole, three branch's pressure break hole insertions in coal seam, main pressure break hole with The perforate spacing in branch's pressure break hole is 2~3m.
B. in four bullports of being constructed at the 5~15m positions of main pressure break hole, four bullports are made to be in main pressure break hole For the center of circle, radius is on 5~15m circle;
C. fracturing unit is connected in main pressure break hole aperture, the fracturing unit includes being made up of intelligent water tank, fracturing pump Water injection equipment and note powder device composition.The outlet pipe of water injection equipment and the flour extraction pipe of note powder device are linked together by threeway, threeway Outlet be connected through high-pressure rubber pipe with pressure break pipe, the outlet pipe of water injection equipment, note be respectively equipped with the flour extraction pipe of powder device it is unidirectional Valve;
D. borehole sealing is carried out to main pressure break hole, branch's pressure break hole and bullport using conventional method for sealing successively;
E. a certain amount of calcium lime powder is added into note powder device, is injected the calcium lime powder noted in powder device by underground blast In main pressure break hole, when all branch's pressure break holes all go out powder, stop note powder;
F. fracturing pump is opened, hydraulic fracturing is carried out to main pressure break hole by water injection equipment, in main pressure break hole and branch's pressure break Crack is produced around hole, calcium lime powder enters crack under the carrying of water under high pressure, while thermal response occurs for calcium lime powder and moisture Substantial amounts of heat is generated, hydrothermal reaction coupling pressure break coal body is realized;
G. repeat step e, f, when water outflow all occur in four bullports, stops hydrothermal reaction coupling pressure break, removes pressure break Equipment, gas drainage pipe network is connected to by main pressure break hole, branch's pressure break hole and bullport, carries out gas pumping;
H. when coal seam gas-bearing capacity is less than 8m3During/t, stop gas pumping, coal seam is opened according to conventional method for uncovering coal.
Beneficial effect:By adopting the above-described technical solution, solving existing stone door punching coal technological deficiency, coal seam is realized Hydrothermal reaction coupling pressure break coal body safe coal-openning, cranny development, extension and the insertion of pre- exposed coal layer are promoted by hydrothermal reaction coupling pressure break, Pressure break influence area increases;Temperature rise promotes the desorption of mash gas of high adsorption, increase pressure break after gas solution in pre- exposed coal layer Pipette;Moisture reacts with calcium lime powder, moisture reduction, reduces the plugging action of moisture after pressure break;Reduce pre- exposed coal layer Crustal stress, gas pressure and gas bearing capacity, by implementing hydrothermal reaction coupling pressure break coal body coal uncovering method, cost is low, safety Property effect significantly, meet the requirements of one's work such as colliery scene deep coal body stone door punching coal.
Brief description of the drawings
One kind that Fig. 1 is the present invention is based on hydrothermal reaction coupling pressure break coal body coal uncovering method borehole pattern.
One kind that Fig. 2 is 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-check valve, 8-2-check valve, 9-valve, 10-threeway, 11-pressure break pipe, 12-note Powder device, 13-calcium lime powder, 14-rock stratum, 15-coal seam.
Embodiment:
The specific embodiment of the invention is further described below in conjunction with the accompanying drawings:
Shown in Fig. 1 and Fig. 2, one kind is based on hydrothermal reaction coupling pressure break coal body coal uncovering method:First, it is disconnected in the tunnel of rock stratum 14 Face 1 is constructed main pressure break hole 2 and three branch's pressure break holes 3 successively, and main pressure break hole 2 is arranged in an equilateral triangle center Place, the position of opening in three branch's pressure break holes 3 is arranged in three apexes of the equilateral triangle, three branch's pressure break holes 3 borehole bottom location is met in the equilateral triangle centerline, is formed using equilateral triangle the bottom of as, is rib with branch's pressure break hole 3 The positive triangular pyramid on side, makes main pressure break hole 2, three insertions in coal seam 15 of branch's pressure break hole 3, main pressure break hole 2 and branch's pressure break The perforate spacing in hole 3 is 2~3m;Four bullports 4 of construction at 5~15m positions apart from main pressure break hole 2, make four guiding It is the center of circle that hole 4, which is in main pressure break hole 2, and radius is on 5~15m circle;Fracturing unit is connected in the main aperture of pressure break hole 2, it is described Fracturing unit includes the water injection equipment being made up of intelligent water tank 5, fracturing pump 6 and note powder device 12 is constituted.The outlet pipe of water injection equipment Linked together with the flour extraction pipe of note powder device by threeway 10, the outlet of threeway 10 is connected through high-pressure rubber pipe 7 with pressure break pipe 11, Check valve 8-1 and check valve 8-2 are respectively equipped with the outlet pipe of water injection equipment, the flour extraction pipe of note powder device 12;Using conventional envelope Hole method carries out borehole sealing to main pressure break hole 2, branch's pressure break hole 3 and bullport 4 successively;Added into note powder device 12 a certain amount of Calcium lime powder 13, the calcium lime powder 13 noted in powder device 12 is injected in main pressure break hole 2 by underground blast, all branches pressure is treated When ceasma 3 all goes out powder, stop note powder;Fracturing pump 6 is opened, hydraulic fracturing is carried out to main pressure break hole 2 by water injection equipment, in master Pressure break hole 2 and the surrounding of branch's pressure break hole 3 produce crack, and calcium lime powder 13 enters crack under the carrying of water under high pressure, while raw stone Ashes 13 and moisture occur thermal response and generate substantial amounts of heat, realize hydrothermal reaction coupling pressure break coal body;When four bullports 4 all occur When 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 connected to watt This extraction pipe network, carries out gas pumping;When the gas bearing capacity of coal seam 15 is less than 8m3During/t, stop gas pumping, according to conventional exposed coal Method opens coal seam 15.Cranny development, extension and the insertion of pre- exposed coal layer, the pressure break zone of influence are promoted by hydrothermal reaction coupling pressure break Domain increases;Temperature rise promotes the desorption of mash gas of high adsorption, increase pressure break after gas desorption quantity in pre- exposed coal layer;Moisture with Calcium lime powder reacts, moisture reduction, reduces the plugging action of moisture after pressure break;Reduce pre- exposed coal layer crustal stress, watt This pressure and gas bearing capacity, by implementing hydrothermal reaction coupling pressure break coal body coal uncovering method, cost is low, and security impact is notable, Meet the requirements of one's work such as colliery scene deep coal body stone door punching coal.

Claims (2)

1. one kind is based on hydrothermal reaction coupling pressure break coal body coal uncovering method, it is characterised in that comprise the following steps:
A. constructed successively main pressure break hole (2) and three branch's pressure break holes (3), main pressure break hole (2) in rock stratum (14) drift section (1) Be arranged in an equilateral triangle center position, the position of opening of three branch's pressure break holes (3) be arranged in this equilateral three Three angular apexes, the borehole bottom location of three branch's pressure break holes (3) is met in the equilateral triangle centerline, makes main pressure Ceasma (2), three branch's pressure break holes (3) are between coal seam (15) interior insertion, the perforate in main pressure break hole (2) and branch's pressure break hole (3) Away from for 2~3m;
B. perforate spacing is 2~3m;Four bullports (4) of construction, it is circle to be in four bullports (4) with main pressure break hole (2) The heart, radius is on 5~15m circle;
C. fracturing unit is connected in main pressure break hole (2) aperture, the fracturing unit is included by intelligent water tank (5), fracturing pump (6) structure Into water injection equipment and note powder device (12) composition.The outlet pipe of water injection equipment and the flour extraction pipe of note powder device are connected by threeway (10) Together, the outlet of threeway (10) is connected through high-pressure rubber pipe (7) with pressure break pipe (11), outlet pipe, the note powder device of water injection equipment (12) check valve A (8-1) and check valve B (8-2) are respectively equipped with flour extraction pipe;
D. drilling is carried out to main pressure break hole (2), branch's pressure break hole (3) and bullport (4) using conventional method for sealing successively close Envelope;
E. a certain amount of calcium lime powder (13) is added into note powder device (12), the life stone in powder device (12) will be noted by underground blast Ashes (13) is injected in main pressure break hole (2), when all branch's pressure break holes (3) all go out powder, stops note powder;
F. fracturing pump (6) is opened, hydraulic fracturing is carried out to main pressure break hole (2) by water injection equipment, in main pressure break hole (2) and branch Crack is produced around pressure break hole (3), calcium lime powder (13) enters crack under the carrying of water under high pressure, at the same calcium lime powder (13) and Moisture occurs thermal response and generates substantial amounts of heat, realizes hydrothermal reaction coupling pressure break coal body;
G. repeat step e, f, when four bullports (4) all water outflow occur, stops hydrothermal reaction coupling pressure break, removes pressure break and set It is standby, main pressure break hole (2), branch's pressure break hole (3) and bullport (4) are connected to gas drainage pipe network, gas pumping is carried out;
H. when coal seam (15) gas bearing capacity is less than 8m3During/t, stop gas pumping, coal seam (15) is opened according to conventional method for uncovering coal.
2. according to claim 1 be based on hydrothermal reaction coupling pressure break coal body coal uncovering method, it is characterised in that:Pressure break pipe (11) seamless steel pipe of aperture is arranged for even tube wall, hole diameter is 10mm, and a diameter of 25mm of seamless steel pipe, seamless steel pipe is 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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Publication number Priority date Publication date Assignee Title
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
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
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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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
CN102242640A (en) * 2011-07-05 2011-11-16 河南煤业化工集团研究院有限责任公司 Rapid outburst elimination method for cross cut coal uncovering in coal mine underground
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