CN103912302B - A kind of layer-through drilling hydraulic rupture gas pumping method - Google Patents

A kind of layer-through drilling hydraulic rupture gas pumping method Download PDF

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Publication number
CN103912302B
CN103912302B CN201410037866.XA CN201410037866A CN103912302B CN 103912302 B CN103912302 B CN 103912302B CN 201410037866 A CN201410037866 A CN 201410037866A CN 103912302 B CN103912302 B CN 103912302B
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coal
hydraulic
gas
pressure
boring
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CN103912302A (en
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周红星
张�荣
程远平
刘清泉
代昊
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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

A kind of layer-through drilling hydraulic rupture gas pumping method, by presetting the target borehole and the hole that penetrate coal seam, as the scope of freedom of hydraulic rupture; Expand the reaming section of target borehole, setting of casing is fixed, and sleeve pipe is connected to separation chamber.Water under high pressure to break coal body after entering boring of breaking, and crack of breaking progressively is expanded until be communicated with hole; Strengthen hydraulic pressure, the water yield, wash away crack surrounding medium; Current carry gas and coal body and enter through target borehole and be separated chamber, and gas is drawn out of, and realizes the separation of methane gas; After washing away, break between boring and target borehole and form mutually through macrocrack.During extraction, gas porous flow enters crack, then flows into target borehole and hydraulic rupture boring, makes Gas Flow pattern generation right-about; The existence in crack is equivalent to extend target borehole and the length of hydraulic rupture boring in coal seam, increases the contact area with coal body, can improve gas pumping effect.

Description

A kind of layer-through drilling hydraulic rupture gas pumping method
Technical field
The present invention relates to a kind of crossing-hole gas extraction, particularly a kind of hydraulic rupture networking layer-through drilling method being applicable to coal bed gas extraction.
Background technology
Along with the increase of mining depth, coal-bed gas pressure and content increase, and ature of coal is soft, and gas permeability of coal seam is low, coal-bed gas not easily extraction before adopting, and coal and gas prominent danger is on the rise, and China has become outstanding the most serious producing coal country in the world.In order to eliminate the outburst hazard in coal seam before adopting, making that high methane is projecting coal bed is converted into present low gas coal seam, regional gas pumping method need be adopted.The regionality that current colliery scene extensively adopts take out in advance coal-bed gas method be the intensive layer-through drilling band of floor roadway take out in advance in conjunction with concordant boring take out in advance.China coal seam experienced by strong tectonic movement more, poor permeability, and extraction radius is little, and in order to shorten the time of Gas pre-drainage, layer-through drilling spacing is generally 3 ~ 5m.The control range that " control coal and gas prominent specify " takes out in advance to coal roadway stripe, at more than 35m, therefore screens the layer-through drilling of coal roadway stripe usually to arrange more than 7 rows.
In addition, layer-through drilling takes out the deficiency of existence two aspects in advance: the rock segment length 1) holed, and coal seam section is short, and the utilization rate of boring is low; 2) layer-through drilling isolated to exist, and during extraction, gas enters boring with the form of seepage flow, and the coal body of each hole pumping and mining separately in control range, without contacting directly between boring, cause the engineering quantity of layer-through drilling mash gas extraction large, extraction efficiency is low.Therefore, adopt during the method and need coordinate the anti-reflection measure in corresponding coal seam.
Summary of the invention
Technical problem: the object of the invention is the weak point overcome in prior art, provides the engineering quantity that a kind of method is simple, reduce layer-through drilling mash gas extraction, improves the layer-through drilling hydraulic rupture gas pumping method of extraction efficiency.
Technical scheme: layer-through drilling hydraulic rupture gas pumping method of the present invention, comprises the steps:
A, at distance seat earth 20m ~ 30m, compose that to deposit construction diameter in stable rock gangway be 100mm target borehole, the coal seam section of technology to target borehole implements reaming routinely, forms target hole;
B, carry out to the aperture of target borehole the reaming that length is 1.5m, counter bore diameter is 130mm, lays the sleeve pipe that diameter is 100mm, and use accelerated cement fixed sleeving in reaming section, then sleeve port high-pressure rubber pipe be separated chamber and be connected;
C, to construct the boring of hydraulic rupture respectively to direction, coal seam in target borehole both sides, the diameter of hydraulic rupture boring is 90mm, and the terminal of hydraulic rupture boring and the spacing of target hole 3 are 15 ~ 20m;
D, in hydraulic rupture boring, placement diameter is the high pressure water injection pipe of 50mm, and high pressure water injection pipe enters the 1/3 thickness place in coal seam; Annular gap cementing mortar between holing to high pressure water injection pipe and hydraulic rupture, fixing high pressure water injection pipe;
E, be connected with high-pressure hydraulic pump by high pressure water injection pipe with high-pressure hose, open high-pressure hydraulic pump, provide water under high pressure to coal seam, break coal body;
The change of f, record hydraulic pressure, discharge, when hydraulic pressure decline 30% or target borehole there are flowing out, strengthen hydraulic pressure, the water yield of high-pressure hydraulic pump, wash away coal body, current carry gas and enter with coal body be separated chamber through hole, target borehole, gas is taken away the gas be separated in chamber by extraction pipeline, realize coal, gas is separated with water;
G, when continuing to go out without coal body, close high-pressure hydraulic pump, stop hydraulic rupture; According to the gas amount that flow and the concentration calculating of extraction pipeline are extracted out, weigh the coal amount being separated and precipitating in chamber, analyze hydraulic rupture effect;
H, closed target borehole and hydraulic rupture boring, and they are connected to methane gas extraction pipeline, the gas in extraction hydraulic rupture scope coal body.
The pressure of supply water of described high-pressure hydraulic pump in more than 25MPa, the water yield at 15m 3/ more than h.
Beneficial effect: the present invention is directed to that the layer-through drilling utilization rate of taking out coal-bed gas is in advance low, mutually isolatedly between boring cause the low present situation of pre-pumping efficiency, preset the target borehole (hole) penetrating coal seam, as the scope of freedom of hydraulic rupture; Arrange that hydraulic rupture is holed at distance objective boring 15 ~ 20m place (distance in coal seam), note water under high pressure breaks, washes away coal body, interconnective macrocrack passage is formed between hydraulic rupture boring and target borehole, improve the gas permeability of hydraulic rupture influence basin coal body, change Gas Flow pattern, improve gas pumping effect.The method produces the crack of macroscopic view between layer-through drilling, easy construction, and common laborer can complete; Overcome that layer-through drilling takes out that coal-bed gas boring utilization rate is low in advance, adverse effect mutually isolated between boring, coal-bed gas desorb first target approach boring and hydraulic rupture hole between macrocrack, enter layer-through drilling again, the covert length extending layer-through drilling, Gas Flow pattern there occurs the change of essence, can significantly improve gas pumping efficiency.
Accompanying drawing explanation
Fig. 1 is hydraulic rupture gas pumping method schematic diagram of the present invention.
In figure: 1-coal seam; 2,2 '-crack; 3-target hole; 4,4 '-hydraulic rupture boring; 5-target borehole; 6-high pressure water injection pipe; 7-reaming section; 8-floor roadway; 9-high-pressure hydraulic pump; 10-is separated chamber; 11-extraction pipeline.
Detailed description of the invention
Below in conjunction with accompanying drawing, one embodiment of the present of invention are further described:
As shown in Figure 1, the method for hydraulic rupture draining coal seam gas of the present invention, concrete steps are as follows:
A, at distance coal seam 1 base plate 20m ~ 30m, compose and depositing the target borehole 5 penetrating coal seam 1 that construction diameter in stable rock gangway 8 is 100mm, technology implements reaming to the coal seam section of target borehole 5 routinely, forms target hole 3;
B, carry out reaming to target borehole 5 aperture section, reaming length is 1.5m, and counter bore diameter is 130mm, lays the sleeve pipe 7 that diameter is 100mm in reaming section, and with accelerated cement fixed sleeving 7, then with high-pressure rubber pipe splicing sleeve 7 be separated chamber 10;
C, to construct hydraulic rupture boring 4 respectively to direction, coal seam in target borehole 5 both sides, the diameter of hydraulic rupture boring 4 is 90mm, and the hydraulic rupture boring terminal of 4 and the spacing of target hole 3 are 15 ~ 20m;
D, in hydraulic rupture boring 4, placement diameter is the high pressure water injection pipe 6 of 50mm, until high pressure water injection pipe 6 enters into thickness place, coal seam 1/3, afterwards, in the annular gap that high pressure water injection pipe 6 and hydraulic rupture are holed between 4, cementing mortar carries out sealing of hole, fixing high pressure water injection pipe 6;
E, connect high pressure water injection pipe 6 and high-pressure hydraulic pump 9 with high-pressure hose, the pressure of supply water of high-pressure hydraulic pump 9 in more than 25MPa, the water yield at 15m 3the water under high pressure of/more than h, open high-pressure hydraulic pump 9 and provide water under high pressure to coal seam 1, break coal body; After hydraulic rupture, the flow regime of coal-bed gas changes, Coalbed Gas Seepage enters crack 2, flow into target borehole 5 and hydraulic rupture boring 4 again, the existence in crack 2 is equivalent to extend target borehole 5 and the length of hydraulic rupture boring 4 in coal seam, increase the contact area with coal seam, can gas pumping effect be improved;
The change of f, record hydraulic pressure, discharge, when hydraulic pressure decline 30% or target borehole 5 there are flowing out, show to break between boring 4 and target borehole 5 and define through crack, now strengthen hydraulic pressure, the water yield of high-pressure hydraulic pump 9, wash away the coal body around through crack, current carry gas and finally enter with coal body be separated in chamber 10 through hole 3, target borehole 5, take through methane gas extraction pipeline 11 gas be separated in chamber 10 away, realize being separated of gas and coal body and water;
G, along with the increase of going out coal body amount in target borehole 5, break the macrocrack progressively being formed between boring 4 and target borehole 5 and be interconnected, and closes high-pressure hydraulic pump 9, stops hydraulic rupture; The flow shown according to pressure meter on extraction pipeline 11 and densimeter calculate the gas amount of extraction, and by weighing the coal amount being separated and precipitating in chamber 10, analyze hydraulic rupture effect;
H, closed target borehole 5 and hydraulic rupture boring 4, and they are connected respectively to methane gas extraction pipeline, carry out the gas pumping in hydraulic rupture scope coal body.
Shown in Fig. 1: solid arrow is water (flow) direction; Dotted arrow is the flow direction of water, gas and coal; Hydraulic rupture boring 4 ' is constructed complete for breaking, define crack 2 ' between hole; Hydraulic rupture boring 4 is for carry out hydraulic rupture, and crack 2 is formed.

Claims (1)

1. a layer-through drilling hydraulic rupture gas pumping method, is characterized in that comprising the steps:
A, in the rock gangway (8) of distance coal seam (1) base plate 20m ~ 30m, construction diameter is being 100mm target borehole (5), and technology implements reaming to the coal seam section of target borehole (5) routinely, forms target hole (3);
B, the reaming that length is 1.5m is carried out to the aperture of target borehole (5), counter bore diameter is 130mm, in reaming section, lay the sleeve pipe (7) that diameter is 100mm, and with accelerated cement fixed sleeving (7), then use high-pressure rubber pipe splicing sleeve (7) and be separated chamber (10);
C, in target borehole (5) both sides respectively to direction, coal seam construction hydraulic rupture boring (4,4 '), hydraulic rupture boring (4,4 ') diameter is 90mm, the hydraulic rupture boring terminal of (4,4 ') and the spacing at target hole (3) center are 15 ~ 20m;
D, in hydraulic rupture boring (4,4 '), place diameter be the high pressure water injection pipe (6) of 50mm, until high pressure water injection pipe (6) enters the 1/3 thickness place in coal seam; Afterwards, in the annular gap that high pressure water injection pipe (6) and hydraulic rupture were holed between (4,4 '), cementing mortar carries out sealing of hole, fixing high pressure water injection pipe (6);
E, with high-pressure hose, high pressure water injection pipe (6) to be connected with high-pressure hydraulic pump (9), to open high-pressure hydraulic pump (9), provide water pressure in more than 25MPa, the water yield at 15m to coal seam (1) 3the water under high pressure of/more than h, break coal body;
The change of f, record hydraulic pressure, discharge, when hydraulic pressure decline 30% or target borehole (5) there are flowing out, show boring (4 of breaking, 4 ') and between target borehole (5) through crack is defined, now strengthen the hydraulic pressure of high-pressure hydraulic pump (9), the water yield, wash away the coal body around through crack, current carry gas and finally enter with coal body be separated in chamber (10) through hole (3), target borehole (5), take through methane gas extraction pipeline (11) gas be separated in chamber (10) away, realize being separated of gas and coal body and water;
G, along with the increase of going out coal body amount in target borehole (5), hydraulic rupture boring (4, 4 ') and between target borehole (5), progressively form the macrocrack (2 be interconnected, 2 '), the flow regime of coal-bed gas changes, Coalbed Gas Seepage enters crack (2, 2 '), flow into target borehole (5) and hydraulic rupture boring (4 again, 4 '), crack (2, 2 ') existence is equivalent to extend target borehole (5) and hydraulic rupture boring (4, 4 ') length in coal seam, increase the contact area with coal seam, gas pumping effect can be improved, when continuing to go out without coal body, close high-pressure hydraulic pump (9), stop hydraulic rupture, according to the gas amount that flow and the concentration calculating of extraction pipeline (11) are extracted out, weigh the coal amount being separated and precipitating in chamber (10), analyze hydraulic rupture effect,
H, closed target borehole (5) and hydraulic rupture boring (4,4 '), and they are connected to methane gas extraction pipeline (11), carry out the gas pumping in hydraulic rupture scope coal body.
CN201410037866.XA 2014-01-26 2014-01-26 A kind of layer-through drilling hydraulic rupture gas pumping method Expired - Fee Related CN103912302B (en)

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* Cited by examiner, † Cited by third party
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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
CN105484790A (en) * 2015-11-24 2016-04-13 中国矿业大学 Method for promoting gas extraction and working face dust fall by injecting water at intervals in drilling holes
CN106285599B (en) * 2016-08-05 2018-06-29 河南能源化工集团研究院有限公司 A kind of anti-reflection draining coal seam gas method of waterpower changing of the relative positions release
CN106567710A (en) * 2016-10-18 2017-04-19 安徽理工大学 Rapid coal uncovering method with effects of uniform pressure releasing and integrated collapse
CN108894728A (en) * 2018-07-27 2018-11-27 淮南矿业(集团)有限责任公司 A kind of construction method of gas drainage directional long borehole group and directional long borehole

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CN102493833A (en) * 2011-11-25 2012-06-13 重庆市能源投资集团科技有限责任公司 Depressurized extraction method for cutting through roof or floor of coal seam by abrasive water jet
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Publication number Priority date Publication date Assignee Title
CN101644166A (en) * 2009-07-14 2010-02-10 中国矿业大学 Method for extracting gas from high gas low permeability coal seam by punching, slotting, pressure releasing, and permeability increasing
CN102071920A (en) * 2010-12-30 2011-05-25 河南理工大学 Gas extraction equipment and method for low coal penetration layer
CN102213077A (en) * 2011-05-25 2011-10-12 煤炭科学研究总院沈阳研究院 Coal seam reaming system using three-dimensional (3D) swirling water jet and reaming and fracturing method for permeability enhancement
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