CN103899348A - Method for fast extracting gas on coalface - Google Patents

Method for fast extracting gas on coalface Download PDF

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Publication number
CN103899348A
CN103899348A CN201410165715.2A CN201410165715A CN103899348A CN 103899348 A CN103899348 A CN 103899348A CN 201410165715 A CN201410165715 A CN 201410165715A CN 103899348 A CN103899348 A CN 103899348A
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China
Prior art keywords
coal
pressure break
coal seam
extraction
gas
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Pending
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CN201410165715.2A
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Chinese (zh)
Inventor
郭臣业
李栋
覃乐
周东平
周俊杰
张尚斌
沈大富
徐涛
王联
何华
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Chongqing Energy Technology Investment Group Co Ltd
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Chongqing Energy Technology Investment Group Co Ltd
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Application filed by Chongqing Energy Technology Investment Group Co Ltd filed Critical Chongqing Energy Technology Investment Group Co Ltd
Priority to CN201410165715.2A priority Critical patent/CN103899348A/en
Publication of CN103899348A publication Critical patent/CN103899348A/en
Pending legal-status Critical Current

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Abstract

The invention discloses a method for fast extracting gas on a coalface. The method includes that a bottom extraction roadway with the distance to a coal seam no smaller than 5 m is tunneled on a coal seam floor; a plurality of fracture drill holes extending into the coal seam are formed in the bottom extraction roadway, the center distance between every two adjacent fracture drill holes in the position entering the coal seam is between 30 m and 50 m, and the depth of the fracture drill holes in the rock stratum is not smaller than 10 m; the fracture drill holes are sealed according to fracture sealing requirements, and the coal seam is hydraulically fractured; the fracture drill holes are connected with an underground gas extraction system of a coal mine, and then coal seam gas can be extracted; a plurality of extraction holes extending into the coal seam are formed in the bottom extraction roadway, and the center distance from any extraction hole to the adjacent extraction holes or the position for the corresponding fracture drill hole to enter the coal seam is between 5 m and 8 m; the extraction holes are sealed according to extraction sealing requirements; coal seam gas is extracted through the extraction holes till the coal seam gas content reaches the standard. The method for fast extracting gas on the coalface has the advantages of having fewer drill holes and being high in extraction efficiency and coal mining efficiency, and roadway tunneling and coal mining work can be performed safely.

Description

The quick pumping method of a kind of coal-face gas
Technical field
The present invention relates to a kind of coal-bed gas gas pumping method, the quick pumping method of especially a kind of coal-face gas.
Background technology
Coal-bed gas is a kind of clear energy sources, but for coal production a kind of disaster source especially.The coal of China is composed and is deposited complex geologic conditions, mainly relies on underground mining, and along with the increase of mining depth, coal seam gas-bearing capacity increases gradually, and coal-bed gas pressure increases, and outstanding danger increases, and protrusion-dispelling difficulty is increasing.Existing coal-face gas pumping is to carry out extraction by playing concordant boring in transport lane and inherent this coal seam of return airway respectively.Because boring in soft outstanding coal road driving tends to occur collapse hole, spray orifice, stick of tool and crown drill phenomenon even can cause coal and Gas Outburst, cause hole spacing short, the hole of boring is shapeless, extraction and release coverage little, driving speed is slow.Particularly under Chongqing region, coal seam, colliery is mostly weak seam, have the advantages that seam hardness is low, gas bearing capacity is high, gas permeability is poor, its adjacent drilling hole distance is conventionally at 2~5 meters, boring layout density is large, drilling hole amount is many, to be connected workload large with extraction in boring, and it is particularly outstanding that its defect and deficiency seem.For this reason, need to improve existing coal bed gas extraction mode.
Summary of the invention
The object of the invention is the deficiency for existing drainage from coal seam technology, provide a kind of coal-face gas quick pumping method, to reduce drilling hole amount, improve extraction rate, guarantee the safety of coal work.
For achieving the above object, the present invention adopts following technical scheme:
The quick pumping method of a kind of coal-face gas, comprises the following steps:
A, in seat earth along bearing driving Yi Dichou lane, Di Chou lane wall is more than or equal to 10 meters apart from coal seam distance;
In b, Gai Dichou lane, form multiple pressure break boring of stretching into coal seam, multiple pressure break borings Yan Dichou lane depth direction distributes, and adjacent pressure break boring is 30~50 meters in the center to center distance that enters coal seam place;
C, enter pressure break pipe group at pressure break embedded in hole, and form in the lithosphere hole wall section of pressure break boring the sealing of hole section that meets pressure break seal request, and this sealing of hole segment length is more than or equal to 10 meters;
D, pressure break pipe group is connected with fracturing pump group by pipe fitting, and by fracturing pump group and pressure break pipe group, fracturing is carried out in described coal seam;
The connecting tube of e, dismounting pressure break Guan Zuyu fracturing pump group, is connected pressure break boring with coal mine gas extraction system, carry out coal bed gas extraction;
In g, Gai Dichou lane, form multiple drainage holes that stretch into coal seam, the top in multiple drainage holes Yan Dichou lane circumferentially and depth direction distribute, it is 5~8 meters in the center to center distance that enters coal seam place that arbitrary drainage holes and adjacent drainage holes or pressure break are holed;
G, in drainage holes is put, enter drainage tube, and drainage holes is carried out to sealing of hole by extraction seal request;
H, whole drainage holes are connected with coal mine gas extraction system, continue to carry out coal bed gas extraction, until coal seam gas-bearing capacity meets safe driving standard.
Adopt the present invention of technique scheme, by being set in seat earth, Di Chou Xiang Hedui coal seam carries out pressure break boring and gas pumping hole, its drilling hole amount is far fewer than the drilling hole amount in concordant hole, its workload is little, and pressure break boring and gas pumping hole are worn as coal seam by rock stratum, its bit freezing probability is much smaller than boring concordant hole, and drilling efficiency is high.Meanwhile, multiple layer-through drillings form dot matrix and arrange in coal seam, can effectively improve the permeability in coal seam, thereby effectively improve extraction rate by fracturing, guarantee coal work safety.Meanwhile, gas pumping and fracturing pipeline are all laid by Di Chou lane, the device in Gas of tunnelling can be taken out in advance with coal bed gas extraction work and unite two into one, and save internal layer exploitation time, improve coal mining efficiency.
In the present invention, in the time that the pressure of the drill splits boring, be chosen in appropriate location, top, Di Chou lane and creep into, to guarantee that sealing of hole section is not only positioned on lithosphere, and its length is also not less than 10 meters.Arbitrary pressure break boring both can be located at any side on top, Di Chou lane, and two adjacent pressure break borings are preferably in the formation of top, Di Chou lane and are interspersed, to improve the antireflective effect of coal bed fracturing.
In the present invention, according to coal bed gas extraction needs, also can on the same cross section in described Di Chou lane, lay several in multiple layer-through drillings, further improve coal mining efficiency, shorten total extraction time of gas.
Preferably, described Di Chou lane has circular arc vault.Utilize the stability structure on arc of circle top to improve the safety of operation in Di Chou lane, meanwhile, convenient laying fracturing pump group, extraction system and personnel activity, to improve extraction efficiency.
Preferably, described pressure break bore diameter is 95mm~120mm.To facilitate the bit bore that adopts existing dimensions, and guarantee the convenience of pressure break and extraction to reduce extraction cost, improve extraction efficiency.
The present invention's beneficial effect is compared with prior art, drilling hole amount is few, extraction efficiency is high, tunnelling and coal work safety, and coal mining efficiency is high.
Brief description of the drawings
Fig. 1 is pressure break boring 4 and drainage holes 7 Yu Dichou lane 3 transverse cutting relation of plane schematic diagrames in the inventive method.
Fig. 2 be in the inventive method pressure break boring 4 and 3 longitudinal cross-sections, drainage holes 7 Yu Dichou lane be related to schematic diagram.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is further illustrated, but therefore do not limit the present invention among described practical range.
Referring to Fig. 1, Fig. 2, the quick pumping method of a kind of coal-face gas, comprises the following steps:
A, one have circular arc vault Di Chou lane 3 at the interior driving that moves towards along coal seam 2 of seat earth 1, Di Chou lane 3 walls are more than or equal to 10 meters apart from coal seam 2 distances;
B, the interior formation in Gai Dichou lane 3 be multiple stretches into the pressure break boring 4 that coal seam 2 and diameter are 95mm~120mm, multiple pressure breaks 4 Yan Dichou lanes 3 of holing longitudinally distribute, adjacent pressure break 3 both sides, top, 4 Di Chou lane of holing are laid staggeredly, and are 30~50 meters in the center to center distance that enters 2 places, coal seam;
C, in pressure break boring 4, insert pressure break pipe group 5, and form and meet pressure break seal request sealing of hole section 41 in the lithosphere hole wall section of this pressure break boring 4, and the length of this sealing of hole section 41 is not less than 10 meters;
D, pressure break pipe group 5 is connected with fracturing pump group 6 by pipe fitting, and by fracturing pump group 6 and pressure break pipe group 5, fracturing is carried out in described coal seam 2;
The connecting tube of e, dismounting pressure break pipe group 5 and fracturing pump group 6, is connected pressure break boring 4 with coal mine gas extraction system, carry out coal bed gas extraction;
F, the multiple drainage holes 7 that stretch into coal seam 2 of the interior formation in Gai Dichou lane 3, the depth direction in multiple drainage holes 7 Yan Dichou lanes 3 distributes, the top of the same degree of depth cross section in Di Chou lane 3 is circumferentially distributed with multiple drainage holes 7, and arbitrary drainage holes 7 is 5~8 meters with adjacent drainage holes 7 in the center to center distance that enters 2 places, coal seam; The drainage holes 7 that closes on pressure break boring 4 and pressure break 4 center to center distance of holing are entering 2 places, coal seam at a distance of 5~8 meters;
G, in drainage holes 7, insert drainage tube, and drainage holes 7 is carried out to sealing of hole by extraction seal request;
H, whole drainage holes 7 are connected with coal mine gas extraction system, continue to carry out coal bed gas extraction, until coal seam gas-bearing capacity meets safe driving standard.
In the present embodiment, the quantity of the drainage holes 7 forming on the same cross section in Di Chou lane 3, can determine according to coal seam width, soft or hard degree.
Although combine above accompanying drawing, embodiments of the present invention are described, but those of ordinary skill in the art also can recognize making various variations or amendment in the scope of claims, these modifications and variations are interpreted as within scope of the present invention and intention.

Claims (5)

1. the quick pumping method of coal-face gas, is characterized in that, comprises the following steps:
A, in seat earth (1) along coal seam (2) move towards driving Yi Dichou lane (3), Di Chou lane (3) wall apart from coal seam (2) distance be more than or equal to 10 meters;
In b, Gai Dichou lane (3), form multiple pressure break boring (4) of stretching into coal seam (2), multiple pressure break borings (4) Yan Dichou lane (3) depth direction distributes, and adjacent pressure break boring (4) is 30~50 meters entering the center to center distance of locating in coal seam (2);
C, in pressure break boring (4), insert pressure break pipe group (5), and form in the lithosphere hole wall section of this pressure break boring (4) the sealing of hole section (41) that meets pressure break seal request, and this sealing of hole section (41) length is more than or equal to 10 meters;
D, pressure break pipe group (5) is connected with fracturing pump group (6) by pipe fitting, and by fracturing pump group (6) and pressure break pipe group (5), described coal seam (2) is carried out to fracturing;
The connecting tube of e, dismounting pressure break pipe group (5) and fracturing pump group (6), is connected pressure break boring (4) with coal mine gas extraction system, carry out coal bed gas extraction;
In f, Gai Dichou lane (3), form multiple drainage holes (7) that stretch into coal seam (2), the top in multiple drainage holes (7) Yan Dichou lanes (3) circumferentially and depth direction distribute, arbitrary drainage holes (7) and adjacent drainage holes (7) or pressure break hole (4) be 5~8 meters entering the center to center distance of locating in coal seam (2);
G, in drainage holes (7), insert drainage tube, and drainage holes (7) is carried out to sealing of hole by extraction seal request;
H, whole drainage holes (7) are connected with coal mine gas extraction system, continue to carry out coal bed gas extraction, until coal seam gas-bearing capacity meets safe driving standard.
2. the quick pumping method of coal-face gas according to claim 1, is characterized in that, described Di Chou lane (3) has circular arc vault.
3. the quick pumping method of coal-face gas according to claim 1 and 2, is characterized in that, described pressure break boring (4) diameter is 95mm~120mm.
4. the quick pumping method of coal-face gas according to claim 1 and 2, is characterized in that, is formed with several in multiple pressure breaks borings (4) on the same cross section in described Di Chou lane (3).
5. the quick pumping method of coal-face gas according to claim 1 and 2, is characterized in that, the be interspersed both sides, top in Di Chou lane (3) of described adjacent two pressure breaks borings (4).
CN201410165715.2A 2014-04-23 2014-04-23 Method for fast extracting gas on coalface Pending CN103899348A (en)

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CN104314610A (en) * 2014-10-11 2015-01-28 中煤科工集团重庆研究院有限公司 Coal road stripe region burst-preventing method
CN104712358A (en) * 2015-02-05 2015-06-17 中国矿业大学 Coal seam group with high gas content pressure relief and co-mining method based on gob-side entry retaining of working face of first mining total rock pressure relief
CN104912588A (en) * 2015-05-18 2015-09-16 太原理工大学 Spalling permeability increasing method for rapid excavation of underground seam gateway
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CN109899105A (en) * 2017-12-07 2019-06-18 陇东学院 A kind of multistage crossing-hole gas extraction method of low level for coal petrography alternating layers coal seam
CN110925014A (en) * 2019-11-14 2020-03-27 刘云山 Method for quickly releasing gas by injecting pressure air into coal mine
CN111350535A (en) * 2018-12-05 2020-06-30 重庆大学 Optimization method for controlling mine gas based on fracturing
CN111350534A (en) * 2018-12-05 2020-06-30 重庆大学 Efficient extraction method for mine gas

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104314610A (en) * 2014-10-11 2015-01-28 中煤科工集团重庆研究院有限公司 Coal road stripe region burst-preventing method
CN104712358A (en) * 2015-02-05 2015-06-17 中国矿业大学 Coal seam group with high gas content pressure relief and co-mining method based on gob-side entry retaining of working face of first mining total rock pressure relief
CN104912588A (en) * 2015-05-18 2015-09-16 太原理工大学 Spalling permeability increasing method for rapid excavation of underground seam gateway
WO2018201706A1 (en) * 2017-05-02 2018-11-08 中国矿业大学 Method for efficient gas drainage in coal roadway strips and regional outburst elimination through staged fracturing with long borehole floor beddings
CN109899105A (en) * 2017-12-07 2019-06-18 陇东学院 A kind of multistage crossing-hole gas extraction method of low level for coal petrography alternating layers coal seam
CN111350535A (en) * 2018-12-05 2020-06-30 重庆大学 Optimization method for controlling mine gas based on fracturing
CN111350534A (en) * 2018-12-05 2020-06-30 重庆大学 Efficient extraction method for mine gas
CN110925014A (en) * 2019-11-14 2020-03-27 刘云山 Method for quickly releasing gas by injecting pressure air into coal mine

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Application publication date: 20140702