CN105927270A - Gas extraction method for parallel hole arrangement of L-shaped drilling and fracturing weakening top plate - Google Patents
Gas extraction method for parallel hole arrangement of L-shaped drilling and fracturing weakening top plate Download PDFInfo
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- CN105927270A CN105927270A CN201610522852.6A CN201610522852A CN105927270A CN 105927270 A CN105927270 A CN 105927270A CN 201610522852 A CN201610522852 A CN 201610522852A CN 105927270 A CN105927270 A CN 105927270A
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- 238000005553 drilling Methods 0.000 title claims abstract description 55
- 238000000605 extraction Methods 0.000 title claims abstract description 36
- 230000003313 weakening effect Effects 0.000 title abstract description 4
- 239000003245 coal Substances 0.000 claims abstract description 31
- 238000000034 method Methods 0.000 claims abstract description 28
- 238000005065 mining Methods 0.000 claims abstract description 27
- 238000010276 construction Methods 0.000 claims abstract description 21
- 238000005086 pumping Methods 0.000 claims description 61
- 239000004744 fabric Substances 0.000 claims description 12
- 230000000694 effects Effects 0.000 claims description 8
- 238000002360 preparation method Methods 0.000 claims description 8
- 238000004088 simulation Methods 0.000 claims description 3
- 230000007704 transition Effects 0.000 claims description 3
- 230000009467 reduction Effects 0.000 claims description 2
- 230000008569 process Effects 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 230000006378 damage Effects 0.000 description 4
- 238000005422 blasting Methods 0.000 description 3
- 230000007812 deficiency Effects 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 241001074085 Scophthalmus aquosus Species 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F7/00—Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
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- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Drilling And Exploitation, And Mining Machines And Methods (AREA)
Abstract
The invention relates to a gas extraction method for parallel hole arrangement of an L-shaped drilling and fracturing weakening top plate. The gas extraction method comprises the following steps: firstly, determining drilling positions and selecting drilling parameters on the ground corresponding to a working face of a coal mining seam; secondly, performing L-shaped fracturing drilling and L-shaped gas extraction drilling construction; thirdly, after the L-shaped fracturing drilling construction is finished, arranging a casing pipe and fracturing equipment in an L-shaped drilling hole; fourthly, after the L-shaped gas extraction drilling construction is finished, arranging a gas extraction pipe with air holes in L-shaped gas extraction drilling hole; fifthly, performing fracturing in advance on a coal seam top plate by using a hydraulic jet staged fracturing method; sixthly, extracting fissure zone gas by the gas extraction pipe while performing coal mining operation. According to the scheme, the problems of high mine pressure behavior and transfinite fissure zone gas in a goaf in a coal mining process in the prior art are solved.
Description
Technical field
The present invention relates to gas pumping field, a kind of L-type borehole fracturing weakens the gas in top board parallel cloth hole and takes out
Mining method.
Background technology
Along with China's industrialization development, energy demand increases day by day, and resource exploitation amount grows with each passing day, people have begun to
Deeper stratum and ask for resource.For colliery, current overall development trend is that shallow mine resource is the most exhausted, in deep mine
Resource just exploited energetically, the resource exploitation amount of deep mine is multiplied, and will appear from special deep more than 1200m of more well depth
Mine.But the strong ore deposit pressure increasing with mining depth and coming manifests problem and gas pumping problem seriously governs the peace in colliery
Full production, and consume substantial amounts of manpower and materials and financial resources.
Strong ore deposit being pressed to the improvement manifested, China mainly takes advanced deep hole presplit blasting, water filling softening and fracturing
Method.But when advanced deep hole presplit blasting weakens top board, country rock can be caused disturbance by the vibrations that presplit blasting causes, and quick-fried
Breaking and need to use a large amount of explosive, cost is high, dangerous big, and the harmful gas of explosion generation, flame etc. also bring along a series of harm；Note
The deficiency that water softens is that water injection time is long, and effect is the most obvious；Hydraulic fracturing technology significantly overcomes above two kinds of technology
Deficiency, it has also become a kind of cost-effective colliery tight roof controls technology, and has at home and abroad obtained popularization and application.Right
In gas pumping, there are the goaf gas pumping methods such as gas lane extraction method, pipe laying extraction method and hole pumping and mining method.Gas lane is taken out
Adopting method effect obvious, can effectively reduce fire damp content, but cost is the highest, the construction period is long；Pipe laying extraction method is often arranged
Must be away from base plate compared with near and cause extraction concentration relatively low, and the rock blocking that is easily caving or damage by pressure；In contrast, as long as holing
Location arrangements is proper, and hole pumping and mining method be can yet be regarded as the high gas pumping method of a kind of economical and effective comprehensive benefit.
Have a very wide distribution in view of China's coal-mine tight roof and be distributed in mining area more than half, such as Datong District, Jincheng, Fructus Jujubae
All there is the strong ore deposit pressure that tight roof causes and manifest problem in the village, Tonghua, Hegang, Shen Fu, east victory etc., also have many mines to deposit simultaneously
In serious gas exceeding limit problem.Need badly propose a kind of new gas pumping scheme to solve in process of coal mining occur strong
Ore deposit pressure manifests problem and goaf fissure zone gas exceeding limit problem.
Summary of the invention
It is an object of the invention to provide a kind of L-type borehole fracturing and weaken the gas pumping method in top board parallel cloth hole, its
Can solve the problem that the strong ore deposit occurred in process of coal mining in prior art pressure manifests problem and goaf fissure zone gas exceeding limit is asked
Topic.
To achieve the above object of the invention, technical scheme is as follows:
A kind of L-type borehole fracturing weakens the gas pumping method in top board parallel cloth hole, and it comprises the steps of:
1) on the ground that institute's mining coal seam work surface is corresponding, determine bore position and choose drilling parameter.
2) boring of L-type pressure break and L-type mash gas pumping drilling construction are carried out.
3), after L-type pressure break drilling construction, in L-type is holed, sleeve pipe and fracturing unit are arranged.
4), after L-type mash gas pumping drilling construction, arrange in L-type mash gas pumping drilling and carry leachy gas pumping
Pipe.
5) the advanced pre-pressure break roof of method of water-jet staged fracturing is utilized.
6) by gas pumping pipe extraction fissure zone gas while coal mining activity.
Preferably, described step 1) in, the boring of described L-type pressure break and L-type mash gas pumping drilling include towards roof
Straight hole section and the horizontal segment parallel with roof, described straight hole section connects transition, L-type pressure with horizontal segment by inclination section
The horizontal segment splitting boring and L-type mash gas pumping drilling is all disposed within the potential fissure zone above coal seam, preparation face In height；
Wherein, hminFor fissure zone height lower limit, hmaxFor fissure zone height upper limit value.
Preferably, described step 1) in, described L-type mash gas pumping drilling is paralleled with the boring of L-type pressure break, adjacent two borings
Projection pitch on roof is l, and number n=L/l of holing, wherein, L is the length of working face of coal seam, and l is numerical simulation
Or the reference value that test obtains.
Preferably, described step 2) in, there is a L-type pressure break boring between adjacent two L-type mash gas pumping drillings.
Preferably, described step 5) in, using water-jet staged fracturing method, L-type mash gas pumping drilling is executed along boring
The opposite direction of work, along the fracturing string of drag fracturing equipment, is spaced a pressure break spacing and implements pressure break, successively a pressure break coal seam
The each default pressure break place of top board.
Preferably, described step 5) in, hydraulic jetting fracturing spacing value is the distance of face roof under control, advanced pre-pressure break roof
Crossover distance is set to 2 times of distance of face roof under controls.
Instant invention overcomes simple fracturing and weaken roof or the deficiency of cloth hole mash gas extraction, it is achieved utilize water
The advanced pre-pressure break of power staged fracturing technology carries out while weakening roof mining and mash gas extraction operation, reduces on work surface
Corner gas bearing capacity.The present invention, by holing in ground construction L-type, bores the boring of L-type pressure break and L-type mash gas pumping drilling on ground
To preparation face roof, the parallel coal seam of L-type drilling horizontal section is arranged in fissure zone, the boring of L-type pressure break and L-type watt
This extraction borehole is alternately arranged, after roof is carried out advanced staged fracturing induce top board elapse forward with work surface and progressively
It is caving, and elapses forward advanced pre-pressure break roof, extraction fissure zone gas simultaneously with coal-face, thus realize weakening
Roof, reduce strong ore deposit pressure manifest, shortens water component and reduce face upper corner angle gas bearing capacity, solution tight roof under
Ore deposit pressure manifests strong harm and the ineffective problem of gas pumping.
The present invention solves the strong ore deposit pressure occurred in process of coal mining and manifests problem and the solution of goaf fissure zone gas
Gas exceeding limit problem, mining extraction fissure zone gas simultaneously with work surface after the most advanced pre-pressure break roof can be greatly
Improve the extraction efficiency of gas, reduce goaf gas content.
The invention has the beneficial effects as follows:
Being place and the passage of gas loss of methane accumulation according to Overlying Strata In A Face fissure zone, the present invention proposes
Above ground brill L-type pressure break boring with L-type mash gas pumping drilling to coal seam, preparation face in potential fissure zone, advanced precompressed
Split reduction roof, extraction fissure zone gas can obtain following beneficial effect:
1) pressure break weakens roof and destroys the integrity of top board, advantageously reduces and even eliminates strong ore deposit under tight roof
Pressure manifests phenomenon.
2) in potential fissure zone, advanced pre-pressure break weakens roof and can promote the growth in crack in fissure zone in the future, promotees
Enter roof caving, reach to weaken the purpose of top board.
3) existence of drainage holes has guide effect to fracturing fracture, and beneficially induced fractures forms horizontal through crack,
Strengthening top board fracturing effect.
4) gas accumulated in fissure zone after implementing pressure break is easier to by extraction, and utilizes negative pressure extraction can promote coal seam
A large amount of desorbings of gas, make gas extraction concentration higher, and extraction amount is bigger, and extracting result is more preferable.
Accompanying drawing explanation
Fig. 1 is the structural representation of the L-type boring of the present invention；
Fig. 2 is the boring of L-type pressure break and the layout schematic diagram of L-type mash gas pumping drilling of the present invention；
Fig. 3 is the principle schematic of the water-jet that the present invention uses；
Fig. 4 is the drag fracturing design sketch of the present invention；
Fig. 5 is fracturing and the gas pumping schematic side view of the present invention；
Fig. 6 is fracturing and the gas pumping schematic top plan view of the present invention.
Description of reference numerals: R-radius of turn；A-straight hole section；B-inclination section；C-horizontal segment；D-caving zone；E-fissure zone；
F-warp damage；M-mining thickness (for accumulative mining height during separate zone production)；L-face length；-the spacing of wells；D-waterpower is sprayed
Penetrate pressure break spacing (distance of face roof under control)；1-fracturing fracture；2-fracturing fluid；3-annular fluid；4-nozzle；5-annular space low-pressure area；6-ring
Aerial nip；7-annular space higher-pressure region；8-gas.
Detailed description of the invention
The invention will be further described with embodiment below in conjunction with the accompanying drawings.
A kind of L-type borehole fracturing weakens the gas pumping method in top board parallel cloth hole, and it comprises the steps of:
1) on the ground that institute's mining coal seam work surface is corresponding, determine bore position and choose drilling parameter.
According to surface-underground contrast plan, correspond to the ground location that preparation face institute mining coal seam is corresponding, select one group of ground
The location arrangements L-type boring being easy to construction spacious, smooth.L-type boring includes the boring of L-type pressure break and L-type mash gas pumping drilling, L
The boring of type pressure break includes the straight hole section towards roof and the level parallel with roof with L-type mash gas pumping drilling
Section, described straight hole section connects transition with horizontal segment by inclination section.For guaranteeing that fracturing weakens top board after gas extracting result
Significantly, L-type drilling horizontal section is arranged in above coal seam, preparation face in potential fissure zone 1/2～2/3 times of fissure zone height,
The horizontal segment of the boring of L-type pressure break and L-type mash gas pumping drilling is all disposed within the potential fissure zone above coal seam, preparation face In height；Wherein, hminAccording to empirical equation gained fissure zone height lower limit, m；
hmaxAccording to empirical equation gained fissure zone height upper limit value, m.
Fissure zone height h can be determined by following formula:
Competent bed:
Medium ground:
In formula, M is mining thickness (for accumulative mining height during separate zone production), m.
2) boring of L-type pressure break and L-type mash gas pumping drilling construction are carried out.
After choosing surface drilling position, TD2000/600 type hydraulic pressure top drive drilling and advanced Technology of Directional Drilling is selected to exist
Target borehole position carries out L-type drilling construction, adjusts gyroscope angle again and carry out inclination section construction after creeping into certain distance, such as figure
Shown in 1.Described L-type mash gas pumping drilling is paralleled with the boring of L-type pressure break, adjacent two borings projection pitch on roof
For l, between adjacent two L-type mash gas pumping drillings, there is a L-type pressure break boring.Complete a boring tailing edge and this L-type drilling horizontal
Section is perpendicular and next bore position that horizontal range is l construction L-type mash gas pumping drilling, the most alternately the boring of construction pressure break and
Mash gas pumping drilling, as shown in Figure 2.Wherein l is drawn a reasonable value by numerical simulation or experimental result, and boring number n is by formula
N=L/l
Round up after calculating value；In formula, L is face length, m.
3), after L-type pressure break drilling construction, in L-type is holed, sleeve pipe and fracturing unit are arranged, for followed by pressure break
Operation is prepared.
4), after L-type mash gas pumping drilling construction, arrange in L-type mash gas pumping drilling and carry leachy gas pumping
Pipe, and gas pumping pipe is connected to gas pumping device.
5) the advanced pre-pressure break roof of method of water-jet staged fracturing is utilized.
Utilize after fracturing device is ready water-jet special-purpose ejecting instrument produce high speed and high pressure fluid, penetrate sleeve pipe and
Balkstone is to form eyelet and to press off roof strata, as shown in Figure 3；For making top board can be caving in time after pressure break, waterpower is sprayed
Penetrating pressure break spacing d value is the distance of face roof under control, and advanced pressure break distance is set to 2 times of distance of face roof under controls.Along boring in L-type mash gas pumping drilling
The opposite direction of construction, along the fracturing string of drag fracturing equipment, is spaced a pressure break spacing and implements pressure break, successively a pressure break coal
Nozzle is dragged to each pressure break position by drag fracturing tubing string, as shown in Figure 4, so by each default pressure break place of layer top board
The place of pressure break all required pressure breaks successively.
6) by gas pumping pipe extraction fissure zone gas 8 while coal mining activity.
The coal mining activity of work surface just can be begun preparing for when pressure break preparation face overlying top board is to the crossover distance preset,
Elapsing forward with coal-face, top board is progressively caving, and gas builds up above fissure zone, and while mining, extraction is split
Gap band gas 8, as shown in Fig. 5 Fig. 6.
Roof crack after staged fracturing is more grown, and the top board above work surface elapses forward gradually with work surface
Being caving, the top board in work surface front gradually ruptures under pressure break and mining influence, sinks, and its gravity is applied on coal body be conducive to
The crisp coal body of pressure, makes the gas in coal body enter into extraction scope along pressure break crack further；The gas in goaf spills into simultaneously
Fissure zone top is also in the extraction scope of L-type mash gas pumping drilling, and after pressure break, mash gas extraction extracting result is more preferable, takes out
Adopting concentration higher, it is wider that energy extraction is arrived, and extraction is in hgher efficiency.
The present invention is to hang according to China's part big colliery roof large area and do not fall and face upper corner angle gas overpressure
Limit this present situation of refractory, in conjunction with staged fracturing technology and gas pumping technology, is that gas amasss at Overlying Strata In A Face fissure zone
Poly-place is again under the theoretical direction of passage of gas loss, is alternately arranged the boring of L-type pressure break and L-type in potential fissure zone
Mash gas pumping drilling is mined while top board is carried out advanced pressure break and mash gas extraction operation, and final realization weakens top, coal seam
Plate and the target of extraction fissure zone gas, weaken roof, a kind of New methods in working of mash gas extraction offer for China.
Claims (6)
1. the gas pumping method in a L-type borehole fracturing reduction top board parallel cloth hole, it is characterised in that comprise the steps of:
1) on the ground that institute's mining coal seam work surface is corresponding, determine bore position and choose drilling parameter；
2) boring of L-type pressure break and L-type mash gas pumping drilling construction are carried out；
3), after L-type pressure break drilling construction, in L-type is holed, sleeve pipe and fracturing unit are arranged；
4), after L-type mash gas pumping drilling construction, arrange in L-type mash gas pumping drilling and carry leachy gas pumping pipe；
5) the advanced pre-pressure break roof of method of water-jet staged fracturing is utilized；
6) by gas pumping pipe extraction fissure zone gas while coal mining activity.
A kind of L-type borehole fracturing the most according to claim 1 weakens the gas pumping method in top board parallel cloth hole, and its feature exists
In, described step 1) in, the boring of described L-type pressure break and L-type mash gas pumping drilling include the straight hole section towards roof and and coal
The horizontal segment that layer top board is parallel, described straight hole section connects transition, the boring of L-type pressure break and L-type gas with horizontal segment by inclination section
The horizontal segment of extraction borehole is all disposed within the potential fissure zone above coal seam, preparation face
In height；
Wherein, hminFor fissure zone height lower limit, hmaxFor fissure zone height upper limit value.
A kind of L-type borehole fracturing the most according to claim 1 weakens the gas pumping method in top board parallel cloth hole, its feature
It is, described step 1) in, described L-type mash gas pumping drilling is paralleled with the boring of L-type pressure break, and adjacent two borings are at roof
On projection pitch be l, number n=L/l of holing, wherein, L is the length of working face of coal seam, and l is numerical simulation or test obtains
Reference value.
A kind of L-type borehole fracturing the most according to any one of claim 1 to 3 weakens the gas pumping in top board parallel cloth hole
Method, it is characterised in that described step 2) in, there is a L-type pressure break boring between adjacent two L-type mash gas pumping drillings.
A kind of L-type borehole fracturing the most according to claim 4 weakens the gas pumping method in top board parallel cloth hole, its feature
It is, described step 5) in, using water-jet staged fracturing method, L-type mash gas pumping drilling is along the opposite direction of drilling construction
Along the fracturing string of drag fracturing equipment, being spaced a pressure break spacing and implement a pressure break, pressure break roof is each pre-successively
If pressure break place.
A kind of L-type borehole fracturing the most according to claim 5 weakens the gas pumping method in top board parallel cloth hole, its feature
It is, described step 5) in, hydraulic jetting fracturing spacing value is the distance of face roof under control, and the crossover distance of advanced pre-pressure break roof sets
It is set to 2 times of distance of face roof under controls.
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106761406A (en) * | 2016-12-02 | 2017-05-31 | 淮北矿业（集团）有限责任公司 | A kind of ground L-type mash gas pumping drilling |
| 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 |
| CN108894784A (en) * | 2018-07-20 | 2018-11-27 | 中铁十九局集团矿业投资有限公司 | A kind of tight roof orientation acid fracturing control top pressure relief method |
| CN109236354A (en) * | 2018-10-23 | 2019-01-18 | 煤科集团沈阳研究院有限公司 | A kind of face formula pumping method based on gob side entry retaining gas control |
| CN109539920A (en) * | 2018-12-27 | 2019-03-29 | 西安通源石油科技股份有限公司 | A kind of top plate fracturing method and device of coal mining |
| CN109667562A (en) * | 2018-12-19 | 2019-04-23 | 中煤科工集团重庆研究院有限公司 | Mining body gas well up-down combined universe extraction method |
| CN110173240A (en) * | 2019-06-19 | 2019-08-27 | 陕西浩兴坤达新能源科技有限公司 | A kind of coal mine gas drainage method |
| CN110242256A (en) * | 2019-06-19 | 2019-09-17 | 河南理工大学 | A kind of efficient mash gas extraction device of drilling subsection |
| CN110454134A (en) * | 2019-09-05 | 2019-11-15 | 湖南科技大学 | A kind of method of underground raw coal gasification |
| CN111322048A (en) * | 2020-02-21 | 2020-06-23 | 中煤科工集团西安研究院有限公司 | Hard roof rock burst subsection direction-control fracturing treatment technology |
| CN112012783A (en) * | 2020-08-07 | 2020-12-01 | 太原理工大学 | Anti-damage ground drilling gas extraction method |
| CN113217099A (en) * | 2021-06-08 | 2021-08-06 | 国能神东煤炭集团有限责任公司 | Hydraulic directional roof cutting device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106761406A (en) * | 2016-12-02 | 2017-05-31 | 淮北矿业（集团）有限责任公司 | A kind of ground L-type mash gas pumping drilling |
| 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 |
| CN108894784A (en) * | 2018-07-20 | 2018-11-27 | 中铁十九局集团矿业投资有限公司 | A kind of tight roof orientation acid fracturing control top pressure relief method |
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| CN109539920B (en) * | 2018-12-27 | 2023-08-25 | 通源石油科技集团股份有限公司 | Top plate fracturing method and device for coal exploitation |
| CN110242256A (en) * | 2019-06-19 | 2019-09-17 | 河南理工大学 | A kind of efficient mash gas extraction device of drilling subsection |
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| CN110454134A (en) * | 2019-09-05 | 2019-11-15 | 湖南科技大学 | A kind of method of underground raw coal gasification |
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| CN111322048B (en) * | 2020-02-21 | 2021-11-09 | 中煤科工集团西安研究院有限公司 | Hard roof rock burst subsection direction-control fracturing treatment method |
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Application publication date: 20160907 |