CN108086901A - Cross-layer drilling mesh slot permeability increasing method - Google Patents
Cross-layer drilling mesh slot permeability increasing method Download PDFInfo
- Publication number
- CN108086901A CN108086901A CN201711319244.6A CN201711319244A CN108086901A CN 108086901 A CN108086901 A CN 108086901A CN 201711319244 A CN201711319244 A CN 201711319244A CN 108086901 A CN108086901 A CN 108086901A
- Authority
- CN
- China
- Prior art keywords
- drilling
- layer
- nozzle
- self
- pressure hose
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000005553 drilling Methods 0.000 title claims abstract description 99
- 238000000034 method Methods 0.000 title claims abstract description 14
- 230000035699 permeability Effects 0.000 title abstract description 7
- 239000003245 coal Substances 0.000 claims abstract description 49
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 16
- 238000010276 construction Methods 0.000 claims abstract description 10
- 238000001028 reflection method Methods 0.000 claims description 13
- 238000005065 mining Methods 0.000 claims description 5
- 239000007921 spray Substances 0.000 claims description 4
- 238000005452 bending Methods 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 5
- 239000010410 layer Substances 0.000 description 4
- 239000011241 protective layer Substances 0.000 description 3
- 238000000605 extraction Methods 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 239000010454 slate Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 230000005641 tunneling Effects 0.000 description 1
Classifications
-
- 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
- E21B7/00—Special methods or apparatus for drilling
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C37/00—Other methods or devices for dislodging with or without loading
- E21C37/06—Other methods or devices for dislodging with or without loading by making use of hydraulic or pneumatic pressure in a borehole
- E21C37/12—Other methods or devices for dislodging with or without loading by making use of hydraulic or pneumatic pressure in a borehole by injecting into the borehole a liquid, either initially at high pressure or subsequently subjected to high pressure, e.g. by pulses, by explosive cartridges acting on the liquid
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C41/00—Methods of underground or surface mining; Layouts therefor
- E21C41/16—Methods of underground mining; Layouts therefor
- E21C41/18—Methods of underground mining; Layouts therefor for brown or hard coal
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Remote Sensing (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Earth Drilling (AREA)
Abstract
The invention relates to a cross-layer drilling mesh slotting permeability-increasing method, which comprises the following steps: s1: constructing a layer-through drilling hole on a working face to be dug or mined to a designed depth by using a drilling machine; s2: withdrawing the drill rod, loading a self-advancing high-pressure hose into the drill hole, introducing medium-pressure water into the self-advancing high-pressure hose, advancing to the specified position of the cross-layer drill hole by using the self-advancing high-pressure hose, bending the self-advancing high-pressure hose by 90 degrees, and constructing the drill holes distributed along the radial direction of the cross-layer drill hole around the cross-layer drill hole; s3: after the drilling construction along the coal seam is completed, in the process of retreating the self-advancing high-pressure hose, introducing high-pressure water into the self-advancing high-pressure hose to cut coal bodies around the drilled hole along the coal seam, and generating a radial crack; s4: and repeating the steps S2 and S3 to finish the through-layer drilling mesh slotting permeability improvement. The method is simple and convenient, is convenient to operate, increases the effective influence range of the cross-layer drilling, improves the gas drainage rate, greatly reduces the number of the cross-layer drilling, improves the economic benefit, and has wide popularization and application values.
Description
Technical field
The present invention relates to coal mine gas drainage technical field more particularly to a kind of netted slot anti-reflection methods of layer-through drilling.
Background technology
Protective layer, large area are mainly exploited for projecting coal bed region outburst prevention measures take out coal-bed gas etc. in advance both at home and abroad, one
A little serious projecting mines even exploit soft rock and make protective layer progress region protrusion-dispelling, are greatly lowered or eliminate outburst danger.For
Protective layer is projecting coal bed coal roadway tunneling during single projecting coal bed or coal seam group mining, using concordant drilling or bottom (top) slate
Lane construction layer-through drilling takes out the region outburst prevention measures of coal roadway stripe region gas to be dug in advance, and bottom (top) slate lane is generally away from coal seam method
Away from 15~30m, interior wrong or outer wrong 15~30m arrangement.Layer gas pre-drainage drilling is worn for coal roadway stripe to have the following problems：Release
Scope is small, and effective radius of influence is generally less than 2.5m；Borehole engineering amount is big, efficiency is low, and each crossheading to be dug generally requires thousands of
A drilling, as Huainan Mining Group regulation coal roadway stripe wears layer gas pre-drainage drilling as gas pressure ＜ 2MPa and gas bearing capacity ＜
8m3/ t's, by arrangement (axis direction × axis vertical line direction), gas pressure >=2MPa or gas in whole coal point 10m × 5m spacing
Content >=8m3/ t's, by arrangement in whole coal point 5m × 5m spacing.
China's coal-bearing series is complicated, various informative, and poor air permeability, coal seam permeability is low, and gas permeability of coal seam with watt
This outburst amount, drilling gas extraction amount correlation, only coal seam reservoirs release, increase gas permeability could improve gas pumping
Rate.To improve Gas pre-drainage effect, bottom plate lane layer-through drilling takes drilling and draws cave, deep-hole control presplit blasting, deep hole loosening
It is anti-reflection that explosion, high-pressure water jet reaming, hydraulic slotted liner technique, hydraulic fracturing and Compound Measure strengthen release.Though these measures are to improving
Low-permeable high gas layer extraction rate obtains certain effect；But there are apparent limitations, and drilling relief range is small, borehole engineering
Decrement is limited, and project benefit is not notable.
The content of the invention
The anti-reflection hole method of the netted slot of a kind of layer-through drilling provided by the invention, overcomes the deficiency in prior art, carries
It has supplied a kind of method easy, has greatly increased the anti-reflection scope of drilling release, reduce borehole engineering amount, improve wearing for gas pumping efficiency
The netted slot release anti-reflection method of layer drilling.
In order to achieve the above objectives, the present invention provides following technical solution：
A kind of netted slot anti-reflection method of layer-through drilling, includes the following steps：
S1：Using drilling machine to waiting to dig or treat that mining face constructs a layer-through drilling to projected depth；
S2：The drilling rod of drilling machine is exited, self-advancing type high-pressure hose is packed into drilling, middle pressure is passed through to self-advancing type high-pressure hose
Water advances to layer-through drilling designated position using self-advancing type high-pressure hose, and self-advancing type high-pressure hose is bent by guider
It 90 °, constructs in layer-through drilling surrounding medium along the radially-arranged suitable coal bed drilling of layer-through drilling；
S3：After the completion of coal bed drilling construction, by self-advancing type high-pressure hose fallback procedures, every 1~3m to self-advancing type
High-pressure hose is passed through high pressure water to being cut along coal bed drilling surrounding medium, is radially split being generated along coal bed drilling surrounding medium
Seam；
S4：Step S2, S3 is repeated, the construction of remaining concordant drilling and slot work is completed, forms a wide range of layer-through drilling
Netted slot is anti-reflection.
Further, the front end of the self-advancing type high-pressure hose is equipped with nozzle, and the nozzle includes front side to nozzle, radial direction
Nozzle and rear side are to nozzle.
Further, the front side to nozzle, radial nozzles and rear side to the quantity of nozzle be 2.
Further, the front side is 30 ° to the angle of nozzle and nozzle axial direction, and the angle of radial nozzles and nozzle axial direction is
90 °, the angle of rear side to nozzle and nozzle axial direction is 135 °.
Further, construct in step S2 suitable coal bed drilling radially-arranged along layer-through drilling when, front side is to nozzle and rear side
It is opened to nozzle, radial nozzles are closed；
When in step S3 to being cut along coal bed drilling surrounding medium, front side is closed to nozzle and rear side to nozzle, footpath
It is opened to nozzle.
Further, a diameter of 94~133mm of the layer-through drilling, a diameter of 15~35mm of self-advancing type high-pressure hose.
Further, the suitable coal bed drilling length is 5~15m.
Further, the pressure limit of medium pressure water is 10~30MPa, the pressure limit of the high pressure water for 30~
100MPa。
The beneficial effects of the present invention are：The netted slot anti-reflection method of layer-through drilling of the present invention, layer-through drilling have been constructed
After coal, drilling, offer thrust and deslagging effect construction length 5 are cut using self-advancing type high-pressure hose spray nozzle in drilling surrounding
The suitable coal bed drilling of~15m vertical transverses drilling, is passed through high pressure water in high-pressure hose fallback procedures and surrounding medium is cut,
Increase coal body exposed area, form the effective a wide range of netted anti-reflection space of release.The method of the present invention is easy, easy to operate, increasing
The effective coverage of big layer-through drilling, improves gas drainage efficiency, greatly reduces layer-through drilling quantity, improve economic effect
Benefit has and is widely popularized applying value.
Description of the drawings
In order to make the purpose of the present invention, technical solution and advantageous effect clearer, the present invention provides drawings described below and carries out
Explanation：
Fig. 1 implements layout drawing for layer-through drilling self-advancing type high-pressure hose of the present invention；
Fig. 2 is self-advancing type high-pressure hose spray nozzle structure chart of the present invention；
Fig. 3 is schematic diagram after the netted slot of layer-through drilling of the present invention；
Reference sign：1-coal body；2-layer-through drilling；3-along coal bed drilling；4-radial fissure；5-self-advancing type
High-pressure hose；6-nozzle；The front side in 6-1-left side is to nozzle；The front side on 6-2-right side is to nozzle；The radial direction in 6-3-left side
Nozzle；The radial nozzles on 6-4-right side；The rear side in 6-5-left side is to nozzle；The rear side on 6-6-right side is to nozzle.
Specific embodiment
Below in conjunction with attached drawing, the preferred embodiment of the present invention is described in detail.
1. first with drilling machine to waiting to dig or treat that mining face coal body 1 constructs a layer-through drilling 2 to projected depth, such as Fig. 1
It is shown；
2. layer-through drilling 2 construction after the completion of, exit drilling rod, be passed through pressure be 10~30MPa middle pressure water conservancy use from into
Formula high-pressure hose 5 advances to coal seam centre position, enters coal seam by guider 90-degree bent, in 2 surrounding medium of layer-through drilling
Length of constructing is the suitable coal bed drilling 3 of 5~15m vertical transverses drilling；
3. after the completion of constructing along coal bed drilling 3, in 5 fallback procedures of self-advancing type high-pressure hose, it is every 1~3m input pressures
The high pressure water of 30~100MPa generates radially to being cut along 3 surrounding medium of coal bed drilling along 3 surrounding medium of coal bed drilling
Crack 4 forms the anti-reflection space of release, improves gas permeability of coal seam；
4. repeating the above steps, the construction of remaining concordant drilling 3 and slot work are completed, forms a wide range of layer-through drilling net
Shape slot is anti-reflection, as shown in figure 3, increasing effective coverage, reduces layer-through drilling quantity.
In the present embodiment, 5 leading portion of self-advancing type high-pressure hose installation nozzle 6, as shown in Fig. 2, being divided into front side to nozzle, radial direction
Nozzle and rear side are to nozzle, wherein in all nozzles, the front side of left and right two is to the axial angle of nozzle 6-1,6-2 and nozzle 6
30 °, two radial nozzles 6-3,6-4 of left and right and the axial angle of nozzle 6 are 90 °, the rear side of left and right two to nozzle 6-5,6-6 with
The axial angle of nozzle 6 is 135 °, wherein left and right front side act as cutting coal, drilling, left and right radial nozzles 6- to nozzle 6-1,6-2
3rd, 6-4 act as in fallback procedures cutting surrounding medium, and left and right rear side act as self-advancing type high-pressure hose to nozzle 6-5,6-6
5, which advance, provides thrust and deslagging.When input high pressure water along 3 surrounding medium of coal bed drilling to cutting, left and right front side in nozzle 6
It is closed to nozzle 6-1,6-2 and left and right rear side to nozzle 6-5,6-6, left and right radial nozzles 6-3,6-4 are opened；Middle pressure water is passed through to exist
During the suitable coal bed drilling 3 of 2 surrounding medium of layer-through drilling construction vertical transverse drilling, left and right radial nozzles 6-3,6-4 are closed in nozzle 6
It closes, left and right front side is opened to nozzle 6-1,6-2 and left and right rear side to nozzle 6-5,6-6.
Finally illustrate, preferred embodiment above is only to illustrate the technical solution of invention and unrestricted, although passing through
Above preferred embodiment is described in detail the present invention, however, those skilled in the art should understand that, can be in shape
Various changes are made in formula and to it in details, without departing from claims of the present invention limited range.
Claims (8)
1. a kind of netted slot anti-reflection method of layer-through drilling, which is characterized in that include the following steps：
S1：Using drilling machine to waiting to dig or treat that mining face constructs a layer-through drilling to projected depth；
S2：The drilling rod of drilling machine is exited, self-advancing type high-pressure hose is packed into drilling, middle pressure water is passed through to self-advancing type high-pressure hose,
Layer-through drilling designated position is advanced to using self-advancing type high-pressure hose, by self-advancing type high-pressure hose by guider 90-degree bent,
It constructs in layer-through drilling surrounding medium along the radially-arranged suitable coal bed drilling of layer-through drilling；
S3：After the completion of coal bed drilling construction, in self-advancing type high-pressure hose fallback procedures, every 1~3m to self-advancing type high pressure
Hose is passed through high pressure water to being cut along coal bed drilling surrounding medium, and radial fissure is being generated along coal bed drilling surrounding medium；
S4：Step S2, S3 is repeated, the construction of remaining concordant drilling and slot work is completed, it is netted to form a wide range of layer-through drilling
Slot is anti-reflection.
2. a kind of netted slot anti-reflection method of layer-through drilling according to claim 1, it is characterised in that：The self-advancing type is high
The front end of pressure hose is equipped with nozzle, and the nozzle includes front side to nozzle, radial nozzles and rear side to nozzle.
3. a kind of netted slot anti-reflection method of layer-through drilling according to claim 2, it is characterised in that：The front side is to spray
Mouth, radial nozzles and rear side to the quantity of nozzle be 2.
4. a kind of netted slot anti-reflection method of layer-through drilling according to claim 3, it is characterised in that：The front side is to spray
The angle of mouth and nozzle axial direction is 30 °, and the angle of radial nozzles and nozzle axial direction is 90 °, and rear side is to nozzle and nozzle axial direction
Angle is 135 °.
5. a kind of netted slot anti-reflection method of layer-through drilling according to claim 4, it is characterised in that：It constructs in step S2
During suitable coal bed drilling radially-arranged along layer-through drilling, front side is opened to nozzle and rear side to nozzle, and radial nozzles are closed；
When in step S3 to being cut along coal bed drilling surrounding medium, front side is closed to nozzle and rear side to nozzle, is radially sprayed
Mouth is opened.
6. a kind of netted slot anti-reflection method of layer-through drilling according to claim 1, it is characterised in that：The layer-through drilling
A diameter of 94~133mm, a diameter of 15~35mm of self-advancing type high-pressure hose.
7. a kind of netted slot anti-reflection method of layer-through drilling according to claim 1, it is characterised in that：The suitable coal seam drilling
Hole length is 5~15m.
8. a kind of netted slot anti-reflection method of layer-through drilling according to claim 1, it is characterised in that：Medium pressure water
Pressure limit is 10~30MPa, and the pressure limit of the high pressure water is 30~100MPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711319244.6A CN108086901A (en) | 2017-12-12 | 2017-12-12 | Cross-layer drilling mesh slot permeability increasing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711319244.6A CN108086901A (en) | 2017-12-12 | 2017-12-12 | Cross-layer drilling mesh slot permeability increasing method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108086901A true CN108086901A (en) | 2018-05-29 |
Family
ID=62175298
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711319244.6A Pending CN108086901A (en) | 2017-12-12 | 2017-12-12 | Cross-layer drilling mesh slot permeability increasing method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108086901A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108868874A (en) * | 2018-06-27 | 2018-11-23 | 中煤科工集团重庆研究院有限公司 | Hydraulic slotting process method for downward bedding drilling |
| CN109653787A (en) * | 2019-01-25 | 2019-04-19 | 安徽理工大学 | A kind of high artesian high gas layer group coordination pumping and mining pressure relief method |
| CN109779610A (en) * | 2019-02-01 | 2019-05-21 | 西安闪光能源科技有限公司 | Anti-reflection drilling useful effect radius measuring method based on controllable shock wave technology |
| CN111119980A (en) * | 2019-12-18 | 2020-05-08 | 中煤科工集团重庆研究院有限公司 | Uniform self-pressure-relief anti-reflection drilling method |
| CN113187393A (en) * | 2021-03-16 | 2021-07-30 | 中煤科工集团重庆研究院有限公司 | Hydraulic cutting horizontal guiding device based on gravity guiding mechanism and using method |
| CN115355004A (en) * | 2022-09-20 | 2022-11-18 | 山东理工大学 | Method for modifying and strengthening pressure relief of red mud slurry for coal bed rock burst drilling |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101666240A (en) * | 2009-09-27 | 2010-03-10 | 西安美尼矿山设备科技有限公司 | High-pressure water jet anti-outburst permeable system for mine |
| CN102337840A (en) * | 2011-09-19 | 2012-02-01 | 中国矿业大学 | Self-guiding water pressure-switching cutting type broaching drill bit |
| CN104879159A (en) * | 2015-06-11 | 2015-09-02 | 河南理工大学 | Gas permeability-increase extraction device and method for soft coal seam stoping face |
| CN105156085A (en) * | 2015-09-11 | 2015-12-16 | 重庆大学 | Composite fracturing and uniform permeability-improving method for tree-like boreholes in coal seams of underground coal mine |
| CN205422591U (en) * | 2015-09-11 | 2016-08-03 | 平顶山天安煤业股份有限公司 | Hole flushing device of colliery gas drainage drilling in pit |
-
2017
- 2017-12-12 CN CN201711319244.6A patent/CN108086901A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101666240A (en) * | 2009-09-27 | 2010-03-10 | 西安美尼矿山设备科技有限公司 | High-pressure water jet anti-outburst permeable system for mine |
| CN102337840A (en) * | 2011-09-19 | 2012-02-01 | 中国矿业大学 | Self-guiding water pressure-switching cutting type broaching drill bit |
| CN104879159A (en) * | 2015-06-11 | 2015-09-02 | 河南理工大学 | Gas permeability-increase extraction device and method for soft coal seam stoping face |
| CN105156085A (en) * | 2015-09-11 | 2015-12-16 | 重庆大学 | Composite fracturing and uniform permeability-improving method for tree-like boreholes in coal seams of underground coal mine |
| CN205422591U (en) * | 2015-09-11 | 2016-08-03 | 平顶山天安煤业股份有限公司 | Hole flushing device of colliery gas drainage drilling in pit |
Non-Patent Citations (1)
| Title |
|---|
| 张永民等: "电脉冲可控冲击波煤储层增透原理与工程实践", 《煤炭科学技术》 * |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108868874A (en) * | 2018-06-27 | 2018-11-23 | 中煤科工集团重庆研究院有限公司 | Hydraulic slotting process method for downward bedding drilling |
| CN109653787A (en) * | 2019-01-25 | 2019-04-19 | 安徽理工大学 | A kind of high artesian high gas layer group coordination pumping and mining pressure relief method |
| WO2020151207A1 (en) * | 2019-01-25 | 2020-07-30 | 安徽理工大学 | Coordinative extraction and pressure relief method for high confined water high gas coal seam group |
| CN109653787B (en) * | 2019-01-25 | 2024-05-03 | 安徽理工大学 | Coordinated extraction pressure relief method for high-pressure-bearing water and high-gas coal seam group |
| CN109779610A (en) * | 2019-02-01 | 2019-05-21 | 西安闪光能源科技有限公司 | Anti-reflection drilling useful effect radius measuring method based on controllable shock wave technology |
| CN111119980A (en) * | 2019-12-18 | 2020-05-08 | 中煤科工集团重庆研究院有限公司 | Uniform self-pressure-relief anti-reflection drilling method |
| CN111119980B (en) * | 2019-12-18 | 2021-08-17 | 中煤科工集团重庆研究院有限公司 | Uniform self-pressure-relief anti-reflection drilling method |
| CN113187393A (en) * | 2021-03-16 | 2021-07-30 | 中煤科工集团重庆研究院有限公司 | Hydraulic cutting horizontal guiding device based on gravity guiding mechanism and using method |
| CN113187393B (en) * | 2021-03-16 | 2022-05-17 | 中煤科工集团重庆研究院有限公司 | Hydraulic cutting horizontal guiding device based on gravity guiding mechanism and using method |
| CN115355004A (en) * | 2022-09-20 | 2022-11-18 | 山东理工大学 | Method for modifying and strengthening pressure relief of red mud slurry for coal bed rock burst drilling |
| CN115355004B (en) * | 2022-09-20 | 2024-03-19 | 山东理工大学 | Modification and reinforcement pressure relief method for red mud slurry for rock burst drilling of coal seam |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108086901A (en) | Cross-layer drilling mesh slot permeability increasing method | |
| CN108643877B (en) | Coal mine underground coal seam long drilling staged fracturing permeability-increasing and gas extraction method | |
| CN102094668B (en) | High-pressure hydraulic tunneling, pressure releasing and protrusion removing method for upper drainage roadway | |
| CN101614135B (en) | Drilling-explosion-pumping triadic gas extraction method | |
| CN102383828B (en) | Refection reducing and outburst eliminating method for deep-hole hydraulic fracture driving gas shallow hole extraction | |
| CN105971663B (en) | A kind of the drilling arrangement and anti-reflection method of coal seam high-pressure hydraulic slot pressure break | |
| CN108331609B (en) | Bedding drilling, slotting, pressure relief and permeability increasing method | |
| CN102080519A (en) | Method for extracting coal bed gas by negative pressure on ground through gas-coal simultaneous extraction | |
| CN101614134B (en) | Drilling-explosion-pumping triadic pressure-relief outburst-prevention method | |
| CN107905834A (en) | A kind of hypotonic high prominent coal seam architecture gas production method | |
| CN102022133B (en) | Regional gas underground high-pressure jet hole digging, pressure relief and outburst prevention method | |
| CN103306714B (en) | Gas control method for drilling hole and hole three-purpose in close-range coal seam group bottom drainage roadway | |
| CN109209472A (en) | The coal seam pressure relief anti-burst method that a kind of punching, explosion, water filling intercouple | |
| CN101832149A (en) | Method for extracting coal seam gas by underground heat injection | |
| CN111441817B (en) | Method for reinforcing gas extraction by synergistic effect of coal seam drilling jet fracturing and mining pressure | |
| CN104763462A (en) | Method for extracting high-pressure hydraulic cave-manufacturing gas from rock roadway crossing hole | |
| CN104879159A (en) | Gas permeability-increase extraction device and method for soft coal seam stoping face | |
| CN103147734A (en) | Method for multi-section hydraulic fracture along coal layer of underground coal mine | |
| CN102777180A (en) | Method for actively and regionally preventing and controlling rock burst in coal mines | |
| CN102678092A (en) | Method for commonly extracting coal and coal bed gas by up-hole and down-hole joint construction | |
| CN102536240A (en) | Method for preventing rock burst by adopting high-pressure fracturing | |
| CN102678166B (en) | Method for increasing gas extraction rate by permeability increasing of single thick coal seam | |
| CN102086760B (en) | Method for mining coalbed methane through regional underground high-pressure hydraulic drilling and pressure relief | |
| CN102041966A (en) | In-seam or across-seam double-power quick drilling and chambering integrated device and method | |
| CN204627657U (en) | Coal mine gas ground extraction casing programme |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20180529 |