CN104131832A - High-gas-content coal seam punching cutting pressing and sucking integral pressure relief and antireflection gas extraction method - Google Patents

High-gas-content coal seam punching cutting pressing and sucking integral pressure relief and antireflection gas extraction method Download PDF

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Publication number
CN104131832A
CN104131832A CN201410334414.8A CN201410334414A CN104131832A CN 104131832 A CN104131832 A CN 104131832A CN 201410334414 A CN201410334414 A CN 201410334414A CN 104131832 A CN104131832 A CN 104131832A
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hole
punching
coal seam
drill
gas
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CN104131832B (en
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林柏泉
杨威
李贺
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China University of Mining and Technology CUMT
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China University of Mining and Technology CUMT
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Abstract

The invention provides a high-gas-content coal seam punching cutting pressing and sucking integral pressure relief and antireflection gas extraction method. According to the method, firstly, a floor crossing hole is constructed in a coal seam; then, drill retreating is carried out; a special drill pipe and a special drill bit for hydraulic punching are replaced in a drill hole; high-pressure water of 5 to 35MPa is introduced into the drill pipe; the drill bit is rotated and is moved to and fro, and hydraulic punching is implemented on the coal seam; and punching holes with the diameter of 0.3 to 1m are formed around the drill hole. During the drill retreating, the drill bit is moved to a coal seam section with little punching coal yield; the drill bit rotates in situ; the coal seam is cut through the high-pressure water; and flat seam cutting seam grooves are formed. The special drill pipe and the special drill bit for the hydraulic punching retreat; special hydraulic fracturing equipment is connected; and the drill hole is subjected to hydraulic fracturing according to a conventional method; and after the fracturing, the drill hole is sealed according to a conventional method, and gas extraction is carried out. The method provided by the invention breaks through the limitation of a single hydraulic measure, and realizes the integral and uniform pressure relief through punching, seam cutting, fracturing and extraction integral operation, so that the single-hole pressure relief range is improved by more than 50 percent; the single-hole gas pure flow rate is improved by more than 40 percent; the single-hole gas extraction rate is improved by more than 30 percent; and obvious economic benefits and wide application prospects are realized.

Description

A kind of high gas layer blanking is pressed and is taken out integrated release permeability-increasing gas pumping method
Technical field
The present invention relates to a kind of high gas layer blanking pressure and take out integrated release permeability-increasing gas pumping method, be specially adapted to high gassy and low permeability coal seam gas pumping.
Background technology
Mine gas disaster (Gas, gas explosion, coal and Gas Outburst etc.) is the principal element of restriction colliery mining of efficient intensify.Gas pumping is to reduce gas accident to occur, and improves the essential measure of gas using energy source and minimizing greenhouse gas emission.In recent years, in coal seam, the anti-reflection technology of waterpowerization, with remarkable, the practical feature of its effect, is widely used, as hydraulic flushing technology, hydraulic slotted liner technique technology and hydraulic fracturing technology etc. in China's high gassy and low permeability coal seam gas pumping.Engineering practice shows, adopt single waterpower measure to have very large limitation: hydraulic flushing in hole forms certain discharge space by high pressure water impact, broken also discharge section coal body, yet the coal seam for soft or hard skewness, punching hole often presents irregular shape, thereby causes stress raisers; Hydraulic slotted liner technique forms flat slot by repeatedly cutting coal body, part coal body deforms, is caving after slot, stress field redistribution, grow gradually in coal body crack, yet, employing hydraulic slotted liner technique operation easier is high separately, engineering quantity is large, especially for weak seam, coal body creep is serious, and slot is difficult to be shaped, closing of fracture is very fast, and gas pumping is difficult to continue, efficiently carries out; Fracturing can realize coal seam release on a large scale, yet pressure break direction is difficult to control, and crack distributed pole is inhomogeneous, and for hard coal body, Hydraulic fracturing pressure is higher, and operation has certain risk.To sum up, although it is anti-reflection to adopt single waterpower measure to realize to a certain extent coal seam release, be difficult to realize coal seam integral body, evenly release, release antireflective effect is limited, and follow-up driving and stoping operation in stress raisers serious threat.
Summary of the invention
Technical problem: the object of the invention is the problem for prior art existence, provide a kind of simple to operate, release is even, anti-reflection significant high gas layer blanking is pressed and is taken out integrated release permeability-increasing gas pumping method.
Technical scheme: high gas layer blanking of the present invention is pressed and taken out integrated release permeability-increasing gas pumping method, comprises the steps:
A, construct one in from base plate to coal seam and hole to top board, then move back brill;
B, to boring in send into hydraulic flushing in hole drill rod special and drill bit, start rig, drill rod special and drill bit are pushed in coal seam, then in drilling rod, pass into water under high pressure, operation rig is controlled drill rod special and is moved back and forth and drive bit, hydraulic flushing in hole is implemented in coal seam, in boring, form a certain size punching hole, the coal output in punch process in real time record punching path around;
C, after reaching top board position, punching implements to move back brill, according to the punching coal output of record, often move back while being drilled into the less coal seam section of coal output, original place rotary drilling-head 5~15 minutes, under the effect of water under high pressure, coal seam is cut, and interval forms flat one by one slot slot, to increase discharge space;
D, exit hydraulic flushing in hole drill rod special and drill bit, in boring, access special-purpose fracturing equipment, according to a conventional method boring is implemented to fracturing;
E, exit special-purpose fracturing equipment, according to conventional method, boring seal to also mash gas extraction.
The pressure of described water under high pressure is 5~35MPa; Described a certain size the diameter of punching hole is 0.3~1m.
Beneficial effect: realized the preliminary release in coal seam by hydraulic flushing in hole, in hard coal section, punching aperture dwindles, occurs that stress is concentrated, by hydraulic slotted liner technique that this section of coal body fixed a point, realizes coal seam integral body, evenly release, eliminates stress concentrated; Meanwhile, expand boring unload effects scope, expanded coal body migration space.On the basis of hydraulic flushing in hole and hydraulic slotted liner technique, implement fracturing, water under high pressure flows along punching hole and slot slot, realizes controlled guiding fracturing; Meanwhile, coal body loose, the porous that becomes after preliminary release, has reduced water injection pressure and has improved fracturing effect.The present invention has broken the bottleneck problem of single waterpower measure, by punching, slot, pressure break and extraction institutional operation, realized by " line " to " face ", whole, the even release in coal seam by " face " to " body ", the present invention can make single hole relief range improve more than 50%, the pure flow of single hole gas improves more than 40%, and single hole gas pumping rate improves more than 30%, has significant economic benefit and application prospect widely.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
In figure: 1-base plate, 2-top board, 3-coal seam, 4-boring, 5-punching hole, 6-slot slot
The specific embodiment
Below in conjunction with accompanying drawing, one embodiment of the present of invention are further described:
As shown in Figure 1, high gas layer blanking of the present invention is pressed and is taken out integrated release permeability-increasing gas pumping method, first from base plate 1, to coal seam, 3 take out the layer-through drilling 4 of constructing in region in advance, boring 4 is through full coal section and enter the about 0.5m of top board 2, boring 4 has been constructed and has been retreated brill, in boring 4, send into hydraulic flushing in hole drill rod special and drill bit, drilling rod afterbody is connected with rig, start rig, drill rod special and drill bit are pushed in coal seam 3, then in drilling rod, pass into water under high pressure, operation rig is controlled drill rod special and is moved back and forth and drive bit, hydraulic flushing in hole is implemented in coal seam 3, in boring 4, form the punching hole 5 that diameter is 0.3~1m around, coal output in punch process in real time record punching path, according to the boring situation of producing coal, regulate hydraulic pressure, coal output is hour suitable hydraulic pressure that improves, hydraulic pressure adjustable range is controlled at 5~35MPa.After reaching top board 2 positions, punching implements to move back brill, according to the punching coal output of record, often move back while being drilled into the less coal seam section of coal output, original place rotary drilling-head 5~15 minutes, under the effect of water under high pressure, coal seam 3 to be cut, interval forms flat one by one slot slot 6, to increase discharge space, eliminate stress concentrated.After slot finishes, exit hydraulic flushing in hole drill rod special and drill bit, to the special-purpose fracturing equipment of boring 4 interior access, according to a conventional method to the 4 enforcement fracturings of holing, after 3 crack initiations of coal seam, water injection pressure obviously reduces, the water injection pressure that now again raises, so repeated multiple times, until water injection pressure is finally stable while no longer changing, pressure break finishes, and stops water filling.Exit the fracturing unit of boring in 4, according to conventional method, to holing, 4 seal also mash gas extraction.

Claims (3)

1. high gas layer blanking is pressed and is taken out an integrated release permeability-increasing gas pumping method, it is characterized in that, comprise and in coal bed drilling, implement successively hydraulic flushing in hole, hydraulic slotted liner technique, fracturing and gas pumping, concrete steps are as follows:
A, from base plate (1) to coal seam in (3) borings of construction (4) to top board (2), then move back brill;
B, to boring, send into hydraulic flushing in hole drill rod special and drill bit in (4), start rig, drill rod special and drill bit are pushed in coal seam (3), then in drilling rod, pass into water under high pressure, operation rig is controlled drill rod special and is moved back and forth and drive bit, coal seam (3) are implemented to hydraulic flushing in hole, in boring (4), form a certain size punching hole (5) around, the coal output in punch process in real time record punching path;
C, after reaching top board (2) position, punching implements to move back brill, according to the punching coal output of record, often move back while being drilled into the less coal seam section of coal output, original place rotary drilling-head 5~15 minutes, under the effect of water under high pressure, coal seam (3) are cut, and interval forms flat one by one slot slot (6), to increase discharge space;
D, exit hydraulic flushing in hole drill rod special and drill bit, to the special-purpose fracturing equipment of access in boring (4), according to a conventional method boring (4) is implemented to fracturing;
E, exit special-purpose fracturing equipment, according to conventional method, boring (4) seal to also mash gas extraction.
2. a kind of high gas layer blanking according to claim 1 is pressed and is taken out integrated release permeability-increasing gas pumping method, it is characterized in that: the pressure of described water under high pressure is 5~35MPa.
3. a kind of high gas layer blanking according to claim 1 is pressed and is taken out integrated release permeability-increasing gas pumping method, it is characterized in that: described a certain size the diameter of punching hole (5) is 0.3~1m.
CN201410334414.8A 2014-07-14 2014-07-14 A kind of high gas layer rushes the release permeability-increasing gas pumping method of cutting, press and pumping integration Active CN104131832B (en)

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Cited By (12)

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CN104563990A (en) * 2015-01-06 2015-04-29 中国矿业大学 Drilling and blanking integrated and heat injection coordinated enhancing method for extracting coal seam gas
CN104653161A (en) * 2015-02-12 2015-05-27 中国矿业大学(北京) Coal mine underground pulse hydraulic slot cutting-fracturing integral anti-reflection extraction device and method
CN104763462A (en) * 2015-04-07 2015-07-08 中国矿业大学 Method for extracting high-pressure hydraulic cave-manufacturing gas from rock roadway crossing hole
CN105422069A (en) * 2015-11-30 2016-03-23 中国矿业大学 Drilling, punching and cutting coupled pressure-relief permeability-increase method of high-gas-outburst coal seam
CN105507938A (en) * 2015-12-31 2016-04-20 河南理工大学 Construction method of hydraulic flushing and presplit blasting combined permeability-increasing extraction system in drill holes
CN106285768A (en) * 2016-08-04 2017-01-04 重庆大学 CO2directional blasting crack initiation couples anti-reflection gas pumping method with fracturing
CN107218081A (en) * 2017-05-25 2017-09-29 陕西正通煤业有限责任公司 One kind can meet high-pressure hydraulic and cut, presses, note many disaster method for integrated control
CN108457634A (en) * 2018-03-08 2018-08-28 重庆科技学院 Shale horizontal well cuts fracturing process and abradant jet cutting tool
CN108757000A (en) * 2018-04-12 2018-11-06 山东科技大学 A kind of quick slot orientation fracturing system in underground based on drilling machine power and method
CN108871411A (en) * 2018-06-27 2018-11-23 中煤科工集团重庆研究院有限公司 Layer-through drilling hydraulic slotted liner technique release evaluation method
CN109898994A (en) * 2019-03-21 2019-06-18 程领存 A kind of coal seam pressure relief method and device thereof
CN110700798A (en) * 2019-10-09 2020-01-17 中国矿业大学 Efficient gas extraction method for coal seam containing gangue

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CN104563990A (en) * 2015-01-06 2015-04-29 中国矿业大学 Drilling and blanking integrated and heat injection coordinated enhancing method for extracting coal seam gas
CN104563990B (en) * 2015-01-06 2018-04-20 中国矿业大学 One kind bores blanking integration and heat injection cooperative reinforcing coal bed gas extraction method
CN104653161A (en) * 2015-02-12 2015-05-27 中国矿业大学(北京) Coal mine underground pulse hydraulic slot cutting-fracturing integral anti-reflection extraction device and method
CN104653161B (en) * 2015-02-12 2018-04-06 中国矿业大学(北京) The fracturing integrated anti-reflection drainage device of underground coal mine pulsed water slot and method
CN104763462A (en) * 2015-04-07 2015-07-08 中国矿业大学 Method for extracting high-pressure hydraulic cave-manufacturing gas from rock roadway crossing hole
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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
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CN105422069A (en) * 2015-11-30 2016-03-23 中国矿业大学 Drilling, punching and cutting coupled pressure-relief permeability-increase method of high-gas-outburst coal seam
CN105507938B (en) * 2015-12-31 2017-12-22 河南理工大学 Hydraulic flushing in hole combines the construction method of anti-reflection extraction system with presplit blasting in drilling
CN105507938A (en) * 2015-12-31 2016-04-20 河南理工大学 Construction method of hydraulic flushing and presplit blasting combined permeability-increasing extraction system in drill holes
CN106285768A (en) * 2016-08-04 2017-01-04 重庆大学 CO2directional blasting crack initiation couples anti-reflection gas pumping method with fracturing
CN107218081A (en) * 2017-05-25 2017-09-29 陕西正通煤业有限责任公司 One kind can meet high-pressure hydraulic and cut, presses, note many disaster method for integrated control
CN108457634A (en) * 2018-03-08 2018-08-28 重庆科技学院 Shale horizontal well cuts fracturing process and abradant jet cutting tool
CN108757000A (en) * 2018-04-12 2018-11-06 山东科技大学 A kind of quick slot orientation fracturing system in underground based on drilling machine power and method
CN108757000B (en) * 2018-04-12 2019-09-24 山东科技大学 A kind of quick slot orientation fracturing system in underground based on drilling machine power and method
US10774591B2 (en) 2018-04-12 2020-09-15 Shandong University Of Science And Technology Drill-power-based directional hydraulic fracturing system for downhole quick slotting and method thereof
CN108871411A (en) * 2018-06-27 2018-11-23 中煤科工集团重庆研究院有限公司 Layer-through drilling hydraulic slotted liner technique release evaluation method
CN109898994A (en) * 2019-03-21 2019-06-18 程领存 A kind of coal seam pressure relief method and device thereof
CN110700798A (en) * 2019-10-09 2020-01-17 中国矿业大学 Efficient gas extraction method for coal seam containing gangue

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