CN111810225A - Ground L-shaped well under-pressure blasting crack-making and gas drainage and mining method - Google Patents
Ground L-shaped well under-pressure blasting crack-making and gas drainage and mining method Download PDFInfo
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- CN111810225A CN111810225A CN202010887006.0A CN202010887006A CN111810225A CN 111810225 A CN111810225 A CN 111810225A CN 202010887006 A CN202010887006 A CN 202010887006A CN 111810225 A CN111810225 A CN 111810225A
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- 238000005422 blasting Methods 0.000 title claims abstract description 50
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000005065 mining Methods 0.000 title claims abstract description 12
- 239000002360 explosive Substances 0.000 claims abstract description 73
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 27
- 238000005336 cracking Methods 0.000 claims abstract description 11
- 238000004519 manufacturing process Methods 0.000 claims abstract description 6
- 230000015572 biosynthetic process Effects 0.000 claims description 15
- 239000004568 cement Substances 0.000 claims description 6
- 239000002002 slurry Substances 0.000 claims description 6
- 230000000903 blocking effect Effects 0.000 claims description 4
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 239000003245 coal Substances 0.000 abstract description 14
- 238000000605 extraction Methods 0.000 abstract description 12
- 230000000694 effects Effects 0.000 abstract description 6
- 238000007599 discharging Methods 0.000 abstract 2
- 238000009958 sewing Methods 0.000 abstract 1
- 239000011148 porous material Substances 0.000 description 6
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical group C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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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
-
- 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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- 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
- E21B43/263—Methods for stimulating production by forming crevices or fractures using explosives
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42D—BLASTING
- F42D1/00—Blasting methods or apparatus, e.g. loading or tamping
- F42D1/08—Tamping methods; Methods for loading boreholes with explosives; Apparatus therefor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42D—BLASTING
- F42D3/00—Particular applications of blasting techniques
- F42D3/04—Particular applications of blasting techniques for rock blasting
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- General Engineering & Computer Science (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 ground L-shaped well under-pressure blasting seam making and gas discharging and mining method, and belongs to the field of coal mine gas discharging and mining. Providing a ground L-shaped well type structure, wherein the ground L-shaped well comprises a vertical well section, an arc well section and a horizontal well section; the sewing method comprises the following steps: setting water gel explosive, and arranging the explosive along the extension direction of the horizontal well section; filling pressure water, and filling the pressure water into the horizontal well section; plugging, namely plugging the horizontal well section; blasting and cracking, namely detonating the water gel explosive in the horizontal well section, and blasting and seam-making the horizontal well section; and (3) hydraulic fracturing and crack building, wherein the hydraulic fracturing and crack building are carried out in a horizontal well section in a pulse mode. After the drainage and mining method is implemented, the production casing is put down, and drainage and pressure reduction drainage and mining are carried out. The method can improve the seam forming uniformity and the seam size, effectively increase the crack extension range and improve the gas extraction effect and the gas extraction efficiency.
Description
Technical Field
The invention belongs to the field of coal mine gas drainage and mining, and relates to a ground L-shaped well under-pressure blasting crack-making and gas drainage and mining method.
Background
Coal bed gas, commonly referred to as "gas," is a gas whose major component is methane, which is usually associated with coal and stored in the coal bed in an adsorbed state. The coal bed is good fuel, and when the coal bed is mined, a large amount of gas gushes out to cause gas accidents in a coal mine and cause energy waste. The method for extracting and exploiting the gas by adopting the ground L-shaped well is a common method for solving the gas problem. However, because the air permeability of the coal seam is poor, the gas extraction efficiency and the gas extraction effect of the existing L-shaped well are poor, and the gas extraction requirement cannot be met. The blasting and cracking have certain limitation in underground coal mine, the ground blasting is safe before the mining work, the explosive quantity can be increased by the ground well blasting to reach a larger crack expansion range, and the pressure water belt blasting can be used for better cracking and cracking, so that the gas discharge and recovery amount of the ground well and the gas safety during the coal mine production can be improved.
Disclosure of Invention
In view of the above, the invention aims to provide a method for blasting, crack formation and gas drainage and extraction of a ground L-shaped well under pressure, which can increase the crack formation range and the uniformity of cracks in a horizontal well section of the ground L-shaped well, effectively increase the crack extension range, and improve the gas extraction efficiency and the gas extraction effect.
In order to achieve the purpose, the invention provides the following technical scheme:
a ground L-shaped well pressurized blasting seam-making method provides a ground L-shaped well, wherein the ground L-shaped well comprises a vertical well section, an arc-shaped well section and a horizontal well section, and comprises the following steps: setting explosive, and arranging the explosive along the extending direction of the horizontal well section; filling pressure water, and filling the pressure water into the horizontal well section; plugging, namely plugging the horizontal well section; blasting and cracking, detonating explosive in the horizontal well section, and blasting and crack forming are carried out on the horizontal well section.
Optionally, the method further comprises the following steps: and (3) hydraulic fracturing and crack building, wherein the hydraulic fracturing and crack building are carried out in a horizontal well section in a pulse mode.
Optionally, a plurality of explosive boxes are coaxially arranged in the horizontal well section, and the explosive boxes are sequentially arranged along the extending direction of the horizontal well section; the explosive is uniformly arranged on the inner wall of the explosive box, and the explosive is arranged in the horizontal well section through the explosive box.
Optionally, the explosive box is tubular, a plurality of sieve pores are arranged on the pipe wall of the explosive box in a penetrating mode, a short connecting pipe is arranged between every two adjacent explosive boxes, a spring centering device is arranged between the short connecting pipe and the inner wall of the horizontal well section, and the explosive box is arranged on the axis of the horizontal well section through the short connecting pipe and the spring centering device.
Optionally, the difference between the diameter of the cartridge and the diameter of the horizontal well section is 30-40mm, and the radius of the screen holes on the cartridge is 10-15 mm.
Optionally, in the step of 'filling pressure water', the water pressure of the pressure water is 1-2 MPa; in the step of blocking, cement slurry is adopted to block the horizontal well section in the arc well section, the blocking length is 3-5m, a waterproof detonator for detonating explosive is embedded in the cement slurry, and the waiting time is 48 hours.
Alternatively, the "hydraulic fracturing and crack making" step is performed within 1 hour after the "blasting and cracking" step is finished.
Optionally, the explosive is a water gel explosive, and in the step of 'blasting and fracturing', the explosive is detonated in a simultaneous manner.
Optionally, in the step of 'hydraulic fracturing and crack formation', sand-carrying hydraulic fracturing and crack formation is adopted, and the fracturing pressure is 20-35 MPa.
Optionally, after the ground L-shaped well under-pressure blasting seam making method according to any one of claims 1-9 is carried out, a production casing is lowered, and drainage and pressure reduction drainage and production are carried out.
Optionally, the length of the horizontal well section is more than or equal to 500m, the diameter of the horizontal well section is 130-200mm, the horizontal well section is arranged in an inclined mode at an angle of 1-2 degrees, and the tail end of the horizontal well section is lower, so that the horizontal well section is filled with pressure water in the step of filling pressure water.
Optionally, the explosive box adopts a plastic pipe with certain strength, the length of the explosive box is 1m, and the number of the sieve holes on the explosive box is 50.
Alternatively, the junction tube may be 100mm in length and a spring centralizer may be provided on the junction tube to center the cartridge.
The invention has the beneficial effects that:
(1) in the step of setting the explosive, the explosive is arranged along the extending direction of the horizontal well section, and the blasting under pressure is more beneficial to the uniform expansion of cracks and the increase of the air permeability of the coal bed. After the blasting under pressure, the cracks are distributed along the extending direction of the horizontal well section, so that the distribution range of the cracks is increased, and the gas extraction effect and the gas extraction efficiency are improved.
(2) After the step of 'blasting and fracturing', hydraulic fracturing and crack formation are carried out, 'the' blasting and fracturing 'can enable the periphery of the horizontal well section to generate new cracks relatively uniformly,' the 'hydraulic fracturing and crack formation' can further form cracks along the new cracks, the crack formation uniformity, the crack size and the crack formation range are improved, and the crack formation range after the 'blasting and fracturing' and the 'hydraulic fracturing and crack formation' are carried out independently is far larger than the crack formation uniformity and the crack formation range.
(3) The explosive box is coaxial with the horizontal well section, the explosives are uniformly arranged on the inner wall of the explosive box, the explosives can uniformly act on the inner wall of the horizontal well section after being exploded, the explosion crack-causing and crack-making range is uniformly distributed, and a plurality of sieve pores are arranged on the inner wall of the explosive box, so that the transmission of the explosion force of the explosives is facilitated.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
Drawings
For the purposes of promoting a better understanding of the objects, aspects and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:
FIG. 1 is a schematic diagram of a gas drainage and mining method for blasting and crack-making under pressure in a ground L-shaped well;
FIG. 2 is an enlarged view of a portion of a horizontal well section.
Reference numerals: the horizontal well section 1, the arc well section 2, the vertical well section 3, the coal seam 4, the explosive box 5, the junction pipe 6, the spring centering device 7 and the explosive 8.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples may be combined with each other without conflict.
Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in the drawings in which there is no intention to limit the invention thereto; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not an indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes, and are not to be construed as limiting the present invention, and the specific meaning of the terms may be understood by those skilled in the art according to specific situations.
Referring to fig. 1-2, a ground L-shaped well is provided, which includes a vertical well section 3, an arc-shaped well section 2 and a horizontal well section 1. The length of the horizontal well section 1 is more than or equal to 500m, the diameter of the horizontal well section 1 is 130-200mm, the horizontal well section 1 is arranged in an inclined way at 1-2 degrees, and the tail end of the horizontal well section 1 is lower, so that the pressure water in the step of filling the pressure water is favorably filled in the horizontal well section 1.
A gas drainage and mining method for blasting and crack making under pressure for a ground L-shaped well comprises the following steps:
(1) explosive charges 8 are provided, and the explosive charges 8 are arranged along the extending direction of the horizontal well section 1. The explosive 8 is arranged along the extending direction of the horizontal well section 1, and after blasting and fracturing, the cracks are expanded along the horizontal direction of the horizontal well section 1, so that the distribution range of the cracks is enlarged, and the gas extraction effect and the gas extraction efficiency are improved.
In this embodiment, 8 explosives adopt the water gel explosive, and 8 explosives evenly set up on the inner wall of explosive box 5, and explosive box 5 is a plurality of, and a plurality of explosive boxes 5 set up in horizontal shaft section 1 between two parties in proper order along the extending direction of horizontal shaft section 1. The explosive 8 can uniformly act on the inner wall of the horizontal well section 1 after blasting, so that the blasting, cracking and crack-making range is uniformly distributed along the horizontal well section 1. Short connecting pipes 6 are arranged between the explosive boxes 5, the length of the short connecting pipes 6 is 100mm, and the diameter of the short connecting pipes is slightly smaller than the inner diameter of the horizontal well section 1. In this embodiment, a spring centering device 7 is disposed between the short connecting pipe 6 and the inner wall of the horizontal well section 1, and the explosive box 5 is centered on the axis of the horizontal well section 1 through the short connecting pipe 6 and the spring centering device 7.
The explosive box 5 adopts a plastic pipe with certain strength, the length of the explosive box 5 is 1m, and the diameter of the explosive box 5 is 30-40mm smaller than the inner diameter of the horizontal well section 1. The pipe wall of the explosive box 5 is provided with a plurality of sieve pores in a penetrating way, the number of the sieve pores is 50, the radius of the sieve pores is 10-15mm, and the sieve pores are beneficial to the transmission of the blasting force of the explosive 8.
(2) And (3) injecting pressure water, and injecting the pressure water into the horizontal well section 1, wherein the water pressure is 1-2 MPa.
(3) And (3) plugging, namely plugging the horizontal well section 1, plugging the arc well section 2 by using cement slurry for 3-5m, embedding a waterproof detonator in the cement slurry, leading the waterproof detonator out to the ground surface, and waiting for setting for 48 hours. The waterproof detonator is used to detonate the explosive 8.
(4) Blasting and cracking, detonating explosive 8 in the horizontal well section 1, and blasting and crack-making are carried out on the horizontal well section 1.
The explosive 8 is detonated by the waterproof detonator, and the coal seam 4 is cracked and fractured once under the condition of pressurized water, the explosive 8 is detonated simultaneously, and the fracture radius is more than or equal to 50 m.
(5) And (3) hydraulic fracturing and crack building, wherein the hydraulic fracturing and crack building are carried out in the horizontal well section 1 in a pulse mode.
And (3) drilling through the arc well section 2 within 1 hour after the blasting fracturing is finished, and performing fracture making by hydraulic pulse hydraulic fracturing. Carrying out sand-carrying hydraulic fracturing and crack building through high-pressure water on the ground surface, and further crack building, wherein the fracturing pressure is 20-35MPa, and the crack building radius is more than or equal to 100 m. After the 'blasting fracturing' is finished, hydraulic fracturing fracture making is carried out, the 'blasting fracturing' can enable the periphery of the horizontal well section 1 to generate new fractures relatively uniformly, the 'hydraulic fracturing fracture making' can further make fractures along the new fractures, the size and the range of the fracture making are improved, and the range of the fracture making after the 'blasting fracturing' and the 'hydraulic fracturing fracture making' are combined is far larger than the uniformity and the range of the fracture making after the 'blasting fracturing' and the 'hydraulic fracturing fracture making' are independently implemented.
(6) And after the seam is formed, a production casing is put down for drainage and pressure reduction drainage.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.
Claims (10)
1. A ground L-shaped well pressurized blasting seam-making method provides a ground L-shaped well, and the ground L-shaped well comprises a vertical well section, an arc-shaped well section and a horizontal well section, and is characterized by comprising the following steps:
setting explosive, and arranging the explosive along the extending direction of the horizontal well section;
filling pressure water, and filling the pressure water into the horizontal well section;
plugging, namely plugging the horizontal well section;
blasting and cracking, detonating explosive in the horizontal well section, and blasting and crack forming are carried out on the horizontal well section.
2. The ground L-shaped well under-pressure blasting seam making method according to claim 1, characterized by further comprising the following steps:
and (3) hydraulic fracturing and crack building, wherein the hydraulic fracturing and crack building are carried out in a horizontal well section in a pulse mode.
3. The ground L-shaped well under-pressure blasting seam making method according to claim 1, characterized in that: a plurality of explosive boxes are coaxially arranged in the horizontal well section and are sequentially arranged along the extending direction of the horizontal well section; the explosive is uniformly arranged on the inner wall of the explosive box, and the explosive is arranged in the horizontal well section through the explosive box.
4. The ground L-shaped well under-pressure blasting seam making method according to claim 3, characterized in that: the explosive box is tubular, a plurality of sieve meshes are arranged on the pipe wall of the explosive box in a penetrating mode, a connecting short pipe is arranged between every two adjacent explosive boxes, a spring centering device is arranged between the connecting short pipe and the inner wall of the horizontal well section, and the explosive box is arranged on the axis of the horizontal well section through the connecting short pipe and the spring centering device.
5. The ground L-shaped well under-pressure blasting seam making method according to claim 3, characterized in that: the difference between the diameter of the explosive box and the diameter of the horizontal well section is 30-40mm, and the radius of the sieve holes on the explosive box is 10-15 mm.
6. The ground L-shaped well under-pressure blasting seam making method according to claim 1, characterized in that: in the step of filling pressure water, the water pressure of the pressure water is 1-2 MPa;
in the step of blocking, cement slurry is adopted to block the horizontal well section in the arc well section, the blocking length is 3-5m, a waterproof detonator for detonating explosive is embedded in the cement slurry, and the waiting time is 48 hours.
7. The ground L-shaped well under-pressure blasting seam making method according to claim 2, characterized in that: the step of hydraulic fracturing and crack formation is carried out within 1 hour after the step of blasting and cracking is finished.
8. The ground L-shaped well under-pressure blasting seam making method according to claim 1, characterized in that: the explosive adopts water gel explosive, and in the step of 'blasting and cracking', the explosive is detonated in a simultaneous manner.
9. The ground L-shaped well under-pressure blasting seam making method according to claim 2, characterized in that: in the step of hydraulic fracturing and crack formation, sand-carrying hydraulic fracturing and crack formation are adopted, and the fracturing pressure is 20-35 MPa.
10. The gas drainage and mining method for ground L-shaped well pressurized blasting crack making is characterized in that: after the ground L-shaped well under-pressure blasting crack-making method according to any one of claims 1-9 is carried out, a production casing is put down, and drainage and pressure reduction drainage are carried out.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010887006.0A CN111810225A (en) | 2020-08-28 | 2020-08-28 | Ground L-shaped well under-pressure blasting crack-making and gas drainage and mining method |
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| CN202010887006.0A CN111810225A (en) | 2020-08-28 | 2020-08-28 | Ground L-shaped well under-pressure blasting crack-making and gas drainage and mining method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112855110A (en) * | 2021-01-21 | 2021-05-28 | 石家庄铁道大学 | Permeation increasing method for sandstone-type uranium ore layer |
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| CN101644156A (en) * | 2009-07-17 | 2010-02-10 | 中国矿业大学 | Method for weakening coal-rock mass by hydraulic blasting and fracturing |
| CN102168575A (en) * | 2011-03-28 | 2011-08-31 | 河南理工大学 | Loose blasting gas extraction technology of horizontal branch well of coal seam floor |
| US20130032347A1 (en) * | 2011-08-03 | 2013-02-07 | Halliburton Energy Services, Inc. | Method for Generating Discrete Fracture Initiation Sites and Propagating Dominant Planar Fractures Therefrom |
| CN103195466A (en) * | 2013-03-30 | 2013-07-10 | 重庆大学 | Directional water pressure blasting method for improving coal bed gas permeability |
| CN104329113A (en) * | 2014-09-03 | 2015-02-04 | 安徽理工大学 | Gas drainage method by pressure relief of coal bed bottom plate through ground drilling and loosening blasting |
| CN110196003A (en) * | 2019-07-02 | 2019-09-03 | 河南理工大学 | A kind of deep hole blasting quick-burning charge device and loading method |
-
2020
- 2020-08-28 CN CN202010887006.0A patent/CN111810225A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101644156A (en) * | 2009-07-17 | 2010-02-10 | 中国矿业大学 | Method for weakening coal-rock mass by hydraulic blasting and fracturing |
| CN102168575A (en) * | 2011-03-28 | 2011-08-31 | 河南理工大学 | Loose blasting gas extraction technology of horizontal branch well of coal seam floor |
| US20130032347A1 (en) * | 2011-08-03 | 2013-02-07 | Halliburton Energy Services, Inc. | Method for Generating Discrete Fracture Initiation Sites and Propagating Dominant Planar Fractures Therefrom |
| CN103195466A (en) * | 2013-03-30 | 2013-07-10 | 重庆大学 | Directional water pressure blasting method for improving coal bed gas permeability |
| CN104329113A (en) * | 2014-09-03 | 2015-02-04 | 安徽理工大学 | Gas drainage method by pressure relief of coal bed bottom plate through ground drilling and loosening blasting |
| CN110196003A (en) * | 2019-07-02 | 2019-09-03 | 河南理工大学 | A kind of deep hole blasting quick-burning charge device and loading method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112855110A (en) * | 2021-01-21 | 2021-05-28 | 石家庄铁道大学 | Permeation increasing method for sandstone-type uranium ore layer |
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Application publication date: 20201023 |
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| RJ01 | Rejection of invention patent application after publication |