CN112796724A - Method for dynamically driving water, fracturing and permeability increasing of low-permeability coal rock mass by continuous air cannon - Google Patents
Method for dynamically driving water, fracturing and permeability increasing of low-permeability coal rock mass by continuous air cannon Download PDFInfo
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- CN112796724A CN112796724A CN202011597855.9A CN202011597855A CN112796724A CN 112796724 A CN112796724 A CN 112796724A CN 202011597855 A CN202011597855 A CN 202011597855A CN 112796724 A CN112796724 A CN 112796724A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 52
- 239000003245 coal Substances 0.000 title claims abstract description 38
- 230000035699 permeability Effects 0.000 title claims abstract description 22
- 230000001965 increasing effect Effects 0.000 title claims abstract description 19
- 238000000034 method Methods 0.000 title claims abstract description 19
- 239000011435 rock Substances 0.000 title claims abstract description 10
- 238000002347 injection Methods 0.000 claims abstract description 39
- 239000007924 injection Substances 0.000 claims abstract description 39
- 238000007789 sealing Methods 0.000 claims abstract description 27
- 239000002775 capsule Substances 0.000 claims abstract description 18
- 238000005516 engineering process Methods 0.000 claims description 8
- 238000000605 extraction Methods 0.000 claims description 7
- 229910000831 Steel Inorganic materials 0.000 claims description 4
- 239000010959 steel Substances 0.000 claims description 4
- 238000005422 blasting Methods 0.000 description 6
- 239000000243 solution Substances 0.000 description 5
- 230000008569 process Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000005336 cracking Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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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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- 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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- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- 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 provides a method for dynamically driving water, fracturing and permeability increasing of a low-permeability coal rock mass continuous air cannon, and relates to a coal bed permeability increasing method, which is characterized in that hole sealing capsules are adopted to seal hole openings of drill holes, a water injection pump is used for injecting water into the drill holes, the water pressure is ensured to be 0.2-0.5MPa, and then a gas injection pump is used for continuously injecting gas into a gas storage tank through a gas injection pipe; when the air pressure reaches 30MPa, the pressure relief valve is automatically opened, and the high-pressure air of the air storage tank is instantly released through the pressure relief port and drives the water in the drill hole to impact the coal body; when the pressure of the barometer is reduced to 0.5MPa, the pressure relief valve is automatically closed, the water injection pump and the gas injection pump are closed after 10 times of repeated operation at the specified position in the drill hole, and the hole sealing capsule is detached. The method can be used for performing repeated permeability increasing operation on the coal seam for many times.
Description
Technical Field
The invention relates to a coal seam permeability increasing method, in particular to a method for dynamically driving water, cracking and increasing permeability of a low permeability coal rock mass by continuous air cannons.
Background
Most coal mines in China enter deep parts, the gas content of deep coal seams is increased, the gas pressure of the coal seams is higher, and therefore the mining activity faces larger coal and gas outburst threats. In order to eliminate the outburst danger of the coal seam, gas extraction is inevitable and necessary for the coal seam.
The coal and gas outburst coal seam in China generally has the characteristics of small air permeability and low gas extraction efficiency, and the gas extraction efficiency is extremely low. In order to efficiently extract coal seam gas, necessary permeability-increasing measures are indispensable. However, the existing permeability-increasing technology adopted in coal mines in China generally has the problem that the permeability-increasing technology can only be applied once, for example, the deep-hole presplitting blasting technology can only be blasted once in a blasting drill hole, and permeability-increasing operation is realized once. At the moment, the blast hole is destroyed, and subsequent multiple blasting anti-reflection operations cannot be carried out.
For a low permeability coal seam (rock stratum), the permeability increasing effect is difficult to achieve through one permeability increasing operation, and the permeability increasing needs to be performed on the coal seam repeatedly. Moreover, the technological process of field anti-reflection operation should be as simple as possible, and the adopted substances are not dangerous.
Therefore, it is necessary to invent a method for permeability increasing of a coal seam for multiple times.
Disclosure of Invention
Aiming at the problems, the invention provides a method for dynamically driving water, fracturing and permeability increasing of a low-permeability coal rock mass by using a continuous air cannon, which can continuously fracture a coal bed for multiple times and achieve the purpose of improving the gas extraction efficiency.
In order to solve the above problems, the technical scheme provided by the invention is as follows:
a method for dynamically driving water, fracturing and permeability increasing of a low-permeability coal rock mass continuous air cannon comprises the following steps:
a. the gas storage tank (2) is conveyed to a designated position in the drill hole (3) by using the guide rod (1), and the gas injection pipe (4) penetrates through the guide rod (1) and is connected with a gas injection pump (5);
b. sleeving the hole sealing capsule (6) on the guide rod (1), and sealing between a steel cylinder (8) arranged in the hole sealing capsule (6) and the guide rod (1) by using three sealing rings (7);
c. the hole sealing capsule (6) is used for sealing the hole opening part of the drill hole (3), and the water injection pipe (9) passes through the hole sealing capsule (6) to be connected with the water pressure gauge (10) and the water injection pump (11);
d. injecting water into the drill hole (3) by using a water injection pump (11), and ensuring that the water pressure displayed by a water pressure gauge (10) is 0.2-0.5 MPa;
e. continuously filling gas into the gas storage tank (2) through a gas injection pipe (4) by using a gas injection pump (12); when the pressure of the barometer (13) is up to 30MPa, the pressure relief valve (14) is automatically opened, and high-pressure air of the air storage tank (2) is instantly released through the pressure relief port (15) and drives the water of the drill hole to impact coal; when the pressure gauge (13) shows that the pressure is reduced to 0.5MPa, the pressure relief valve (14) is automatically closed,
f. after repeating the operation of the step e for 10 times at the designated position in the drill hole (3), closing the water injection pump (11) and the gas injection pump (12), and unloading the hole sealing capsule (6);
g. and taking all the equipment out of the drill hole (3), and performing gas extraction on the drill hole (3) by adopting a conventional technology.
Compared with the prior art, the invention has the beneficial effects that:
(1) compared with high-pressure water, explosive and the like, the danger of adopting air as an anti-reflection medium is relatively low;
(2) the air cannon can continuously impact and crack the same place, and continuous repeated anti-reflection operation in a certain area is realized.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
in the figure, 1, a guide rod; 2. a gas storage tank; 3. drilling; 4. a gas injection pipe; 5. an air injection pump; 6. sealing the pores with capsules; 7. a seal ring; 8. a steel cylinder; 9. a water injection pipe; 10. a water pressure gauge; 11. a water injection pump; 12. an air injection pump; 13. a barometer; 14. a pressure relief valve; 15. pressure relief port
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
A method for dynamically driving water, fracturing and permeability increasing of a low-permeability coal rock mass continuous air cannon comprises the following steps:
1. constructing a plurality of drill holes 3 for anti-reflection operation in an area to be anti-reflection in a bottom plate roadway or an air return roadway of a coal mine, conveying an air storage tank 2 to a specified position in each drill hole 3 by using a guide rod 1, and connecting an air injection pipe 4 with an air injection pump 5 by penetrating through the guide rod 1;
2. sleeving a hole sealing capsule 6 on a guide rod 1, and sealing a steel cylinder 8 arranged in the hole sealing capsule 6 with the guide rod 1 by using three sealing rings 7;
3. sealing the hole opening part of the drill hole 3 by using the hole sealing capsule 6, and connecting a water injection pipe 9 with a water pressure gauge 10 and a water injection pump 11 by penetrating through the hole sealing capsule 6;
4. injecting water into the drill hole 3 by using a water injection pump 11, and ensuring that the water pressure displayed by a water pressure gauge 10 is always between 0.2 and 0.5 MPa;
5. continuously charging gas into the gas storage tank 2 through the gas injection pipe 4 by using the gas injection pump 12; when the pressure of the barometer 13 is up to 30MPa, the pressure relief valve 14 is automatically opened, and the high-pressure air of the air storage tank 2 is instantly released through the pressure relief port 15 and drives the water of the drill hole to impact coal; when the pressure gauge 13 shows that the pressure is reduced to 0.5MPa, the pressure relief valve 14 is automatically closed,
6. after repeating the operation of the step 4 for 10 times at the designated position in the borehole 3, closing the water injection pump 11 and the gas injection pump 12, and discharging the hole sealing capsule 6;
7. and taking all the equipment out of the drill hole 3, and performing gas extraction on the drill hole 3 by adopting a conventional technology.
In the coal mine underground permeability-increasing operation in China, the permeability-increasing technology can be applied only once, for example, the deep hole presplitting blasting technology can be blasted in a blasting drill hole only once, so that the permeability-increasing operation is realized once. At the moment, the blast hole is destroyed, and subsequent multiple blasting anti-reflection operations cannot be carried out. However, for a low permeability coal seam (rock stratum), the permeability increasing effect is difficult to achieve through one permeability increasing operation, and the permeability increasing of the coal seam needs to be performed for multiple times and repeatedly. If the coal bed is cracked by only adopting the air cannon, the high-pressure air can expand and reduce the pressure after coming out of the air storage tank due to the compressibility of the air, and the impact damage capability to the coal body is smaller. If water is used as a coupling medium of the air storage tank and the hole wall of the drill hole, the energy conduction capability of the air cannon can be greatly improved, high-pressure air expansion force can efficiently act on the coal body, and the cracking effect of the coal body is improved. The water is flushed into the cracks along with the high-pressure air driving the water to impact the coal body to generate the cracks. The water is continuously injected by the water injection pump outside the hole, and the water pressure is ensured to be between 0.2 and 0.5MPa, so that the space in the hole is continuously filled with water. When the pressure of the energy storage tank is reduced to 0.5MPa, the pressure relief valve can automatically close the pressure relief opening to prevent water in the hole from being filled. The gas injection pump is used for continuously injecting gas, so that continuous air cannon impact in the drill hole can be realized, and continuous and repeated anti-reflection operation in the drill hole is realized.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (1)
1. A method for dynamically driving water, fracturing and permeability increasing of a low-permeability coal rock mass continuous air cannon is characterized by comprising the following steps:
a. the gas storage tank (2) is conveyed to a designated position in the drill hole (3) by using the guide rod (1), and the gas injection pipe (4) penetrates through the guide rod (1) and is connected with a gas injection pump (5);
b. sleeving the hole sealing capsule (6) on the guide rod (1), and sealing between a steel cylinder (8) arranged in the hole sealing capsule (6) and the guide rod (1) by using three sealing rings (7);
c. the hole sealing capsule (6) is used for sealing the hole opening part of the drill hole (3), and the water injection pipe (9) passes through the hole sealing capsule (6) to be connected with the water pressure gauge (10) and the water injection pump (11);
d. injecting water into the drill hole (3) by using a water injection pump (11), and ensuring that the water pressure displayed by a water pressure gauge (10) is 0.2-0.5 MPa;
e. continuously filling gas into the gas storage tank (2) through a gas injection pipe (4) by using a gas injection pump (12); when the pressure of the barometer (13) is up to 30MPa, the pressure relief valve (14) is automatically opened, and high-pressure air of the air storage tank (2) is instantly released through the pressure relief port (15) and drives the water of the drill hole to impact coal; when the pressure gauge (13) displays that the pressure is reduced to 0.5MPa, the pressure relief valve (14) is automatically closed;
f. after repeating the operation of the step e for 10 times at the designated position in the drill hole (3), closing the water injection pump (11) and the gas injection pump (12), and unloading the hole sealing capsule (6);
g. and taking all the equipment out of the drill hole (3), and performing gas extraction on the drill hole (3) by adopting a conventional technology.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011597855.9A CN112796724A (en) | 2020-12-29 | 2020-12-29 | Method for dynamically driving water, fracturing and permeability increasing of low-permeability coal rock mass by continuous air cannon |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011597855.9A CN112796724A (en) | 2020-12-29 | 2020-12-29 | Method for dynamically driving water, fracturing and permeability increasing of low-permeability coal rock mass by continuous air cannon |
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| CN112796724A true CN112796724A (en) | 2021-05-14 |
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| CN202011597855.9A Pending CN112796724A (en) | 2020-12-29 | 2020-12-29 | Method for dynamically driving water, fracturing and permeability increasing of low-permeability coal rock mass by continuous air cannon |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114753820A (en) * | 2022-04-06 | 2022-07-15 | 重庆大学 | Ultrasonic-assisted coal seam permeability increasing method and system |
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| US20070199710A1 (en) * | 2006-02-27 | 2007-08-30 | Grant Hocking | Enhanced hydrocarbon recovery by convective heating of oil sand formations |
| CN102155254A (en) * | 2011-02-28 | 2011-08-17 | 中国矿业大学 | Method for extracting gas in low air permeability coal layer by pulse fracture anti-reflection |
| CN103726819A (en) * | 2013-12-27 | 2014-04-16 | 中国石油大学(华东) | Method of low-temperature gas-assisted coalbed methane fracturing technology |
| CN104832149A (en) * | 2015-05-16 | 2015-08-12 | 太原理工大学 | Electric pulse assisted hydrofracture unconventional gas reservoir permeability increasing method |
| CN105298462A (en) * | 2015-11-06 | 2016-02-03 | 中国矿业大学 | High-power electric knocking assisted hydrofracture coal seam permeability increase method for end-located drainage roadway |
| CN109252846A (en) * | 2018-11-13 | 2019-01-22 | 煤科集团沈阳研究院有限公司 | The high pressure air pulse ripples periodically hammering anti-reflection system and method for coal body |
| CN110792468A (en) * | 2019-09-06 | 2020-02-14 | 西安科技大学 | Underground coal mine cyclic pulse gas injection displacement gas extraction system |
-
2020
- 2020-12-29 CN CN202011597855.9A patent/CN112796724A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070199710A1 (en) * | 2006-02-27 | 2007-08-30 | Grant Hocking | Enhanced hydrocarbon recovery by convective heating of oil sand formations |
| CN102155254A (en) * | 2011-02-28 | 2011-08-17 | 中国矿业大学 | Method for extracting gas in low air permeability coal layer by pulse fracture anti-reflection |
| CN103726819A (en) * | 2013-12-27 | 2014-04-16 | 中国石油大学(华东) | Method of low-temperature gas-assisted coalbed methane fracturing technology |
| CN104832149A (en) * | 2015-05-16 | 2015-08-12 | 太原理工大学 | Electric pulse assisted hydrofracture unconventional gas reservoir permeability increasing method |
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| CN110792468A (en) * | 2019-09-06 | 2020-02-14 | 西安科技大学 | Underground coal mine cyclic pulse gas injection displacement gas extraction system |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114753820A (en) * | 2022-04-06 | 2022-07-15 | 重庆大学 | Ultrasonic-assisted coal seam permeability increasing method and system |
| CN114753820B (en) * | 2022-04-06 | 2023-12-05 | 重庆大学 | Ultrasonic-assisted coal seam permeability increasing method and system |
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Application publication date: 20210514 |