CN114810197A - Gas permeability increasing method for coal roadway driving face dynamic and static combined action - Google Patents
Gas permeability increasing method for coal roadway driving face dynamic and static combined action Download PDFInfo
- Publication number
- CN114810197A CN114810197A CN202210553065.3A CN202210553065A CN114810197A CN 114810197 A CN114810197 A CN 114810197A CN 202210553065 A CN202210553065 A CN 202210553065A CN 114810197 A CN114810197 A CN 114810197A
- Authority
- CN
- China
- Prior art keywords
- liquid nitrogen
- coal
- coal seam
- gas
- hole
- 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.)
- Granted
Links
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH 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 DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
- E21B43/2605—Methods for stimulating production by forming crevices or fractures using gas or liquefied gas
Abstract
The invention discloses a gas permeability increasing method with a coal roadway driving face dynamic and static combined action, which relates to the technical field of coal seam gas extraction control, wherein a horizontal seam cutting face is pre-cut on a coal seam close to the bottom of the coal seam by utilizing a protective layer mining principle and a hydraulic seam cutting technology, and a coal seam pressure relief moving space is artificially pre-created; liquid nitrogen cold impact cracking is carried out in the direction parallel to the joint cutting direction at the middle upper part of the coal seam to provide dynamic load, structural damage is carried out on the coal seam by utilizing frost heaving force and gasification expansive force to generate expansion deformation, a migration free surface compensation space is reserved at the bottom, the coal body moves down integrally, dynamic and static combination acts as a gas migration expansion crack channel, and finally the integral cracking effect of the coal body is achieved. According to the invention, the liquid nitrogen fracturing technology and the hydraulic slotting technology are combined for use, so that the coal seam fracture initiation pressure is reduced, fracture expansion and extension are realized, and the gas extraction efficiency is improved.
Description
Technical Field
The invention relates to the technical field of coal seam gas extraction control, in particular to a gas permeability increasing method with a coal roadway driving face dynamic and static combined action.
Background
In order to improve the air permeability of the coal bed, students at home and abroad propose a plurality of technical means, which mainly comprise intensive drilling, cross drilling, coal bed water injection, hydraulic loosening, hydraulic fracturing, hydraulic cutting, water jet reaming, hydraulic punching, high-energy gas fracturing, deep hole loosening blasting and the like. However, coal and gas occurrence in China is complicated and changeable, and coal mine roadway arrangement forms are various.
The existing coal bed permeability increasing technology has a single form. Blasting and cracking; the coal seam is diffused to the periphery by taking the hole as the center to crack, the inherent stress of the coal body is ignored, particularly, a protective layer mining principle is not used in a coal roadway, a horizontal space is not created and utilized as a movement compensation space of the coal body in a larger range, so that the expansion of cracks in the coal seam is small, and the gas extraction effect is poor. Hydraulic technical aspects; due to the high adsorption capacity of the coal bed, the coal bed pore blocking and matrix expansion can be caused after the fracturing fluid is adsorbed, so that the fracture porosity and permeability are reduced, the fracture front edge is easily blocked by aggregation, the direction of the fracture is changed, a resistance barrier is formed at the fracture front edge, and the smoothness of a gas production channel and the gas production rate are influenced. Therefore, the existing coal seam permeability increasing technology still has more problems in practical engineering application, and the permeability increasing effect of the coal seam is not ideal.
Disclosure of Invention
The invention aims to provide a gas permeability increasing method with a coal roadway driving face dynamic and static combined action, and aims to solve the problems in the prior art.
In order to achieve the purpose, the invention provides the following scheme: the invention provides a gas permeability increasing method with a coal roadway driving face dynamic and static combined action, which specifically comprises the following steps:
step one, determining a high gas occurrence area; according to coal mine geological survey, combining a geophysical prospecting technology to avoid a coal seam region with complex geology, completing the detection of the occurrence condition of coal seam gas on a working face to be tunneled, and further determining the range of a high gas occurrence region;
step two, constructing a coal seam pressure relief moving space; horizontally cutting the coal seam by using a horizontal joint cutting technology at a position close to the bottom plate of the coal seam, wherein the formed horizontal slot opening space is used as a pressure relief moving space of the coal seam;
step three, arranging liquid nitrogen conveying holes; adopting a parallel punching method to construct continuous transverse holes in the coal seam with low air permeability from the middle upper part of the coal seam;
step four, liquid nitrogen cold impact; after sealing the hole opening of the liquid nitrogen conveying hole, injecting high-pressure liquid nitrogen into the liquid nitrogen conveying hole by using a cold circulation impact device, and standing for 2-3 hours;
and fifthly, gas extraction.
Preferably, in the second step, the ratio of the distance between the coal seam pressure relief moving space and the coal seam floor to the height of the coal seam is 0.15-0.25: 1, and the ratio of the height of the coal seam pressure relief moving space to the height of the coal seam is 0.03-0.1: 1, the ratio of the horizontal width of the compensation space to the horizontal width of the coal roadway is 0.7-0.9: 1.
Preferably, in the third step, the ratio of the distance between the liquid nitrogen conveying hole and the coal seam roof to the height of the coal seam is 0.1-0.3: 1, and the distance between two adjacent liquid nitrogen conveying holes is 0.4-0.8 m.
Preferably, in the third step, after the construction of the liquid nitrogen conveying hole is completed, water vapor is injected into the liquid nitrogen conveying hole, and the amount of the injected water vapor is controlled to be 0.6-0.8L/min.
Preferably, in the third step, the steam injected into the liquid nitrogen conveying hole is high-pressure steam with the temperature of 120-150 ℃, and the steam injection is stopped when the temperature of the coal seam around the liquid nitrogen conveying hole reaches 120 ℃ to be detected.
Preferably, in the fourth step, the hole sealing mode is to use a hole sealing device to seal the liquid nitrogen conveying hole.
Preferably, in the fourth step, the volume of the high-pressure liquid nitrogen injected into the liquid nitrogen delivery hole accounts for 60% -85% of the total volume of the liquid nitrogen delivery hole.
Preferably, in the fourth step, the cold circulation impact device comprises a liquid nitrogen tank, a conveying pipeline, a pulse pump and a vent valve, the vent valve is installed on the conveying pipeline between the liquid nitrogen tank and the pulse pump, and the conveying pipeline at the outlet end of the pulse pump is fixed in the liquid nitrogen conveying hole through a hole packer.
Preferably, in the fifth step, a plurality of gas extraction holes are drilled at equal intervals along the circumferential direction of the liquid nitrogen conveying hole, the pressure-relief moving space of the coal seam, the liquid nitrogen conveying hole and the gas extraction holes are sealed by adopting a high-pressure grouting method, gas extraction pipes are respectively arranged, and the desorbed gas is extracted by using a gas extraction device; and after the designed extraction time is reached, the extraction effect is checked.
The invention discloses the following technical effects: according to the invention, a horizontal seam cutting surface is pre-cut on a coal seam close to the bottom of the coal seam by utilizing a protective layer mining principle and a hydraulic seam cutting technology, and a coal seam pressure relief moving space is artificially pre-built; liquid nitrogen cold impact cracking is carried out in the direction parallel to the joint cutting direction at the middle upper part of the coal seam to provide dynamic load, structural damage is carried out on the coal seam by utilizing frost heaving force and gasification expansive force to generate expansion deformation, a migration free surface compensation space is reserved at the bottom, the coal body moves down integrally, dynamic and static combination acts as a gas migration expansion crack channel, and finally the integral cracking effect of the coal body is achieved. According to the invention, the liquid nitrogen fracturing technology and the hydraulic slotting technology are combined for use, so that the coal seam fracture initiation pressure is reduced, fracture expansion and extension are realized, and the gas extraction efficiency is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic view of the present invention illustrating drilling and hole distribution;
FIG. 2 is a schematic diagram of the liquid nitrogen injection of coal bodies according to the present invention;
FIG. 3 is a schematic diagram of the liquid nitrogen cold shock cracking mechanism of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
The invention provides a gas permeability increasing method with a coal roadway driving face dynamic and static combined action, which specifically comprises the following steps:
step one, determining a high gas occurrence area; according to coal mine geological survey, combining a geophysical prospecting technology to avoid a coal seam region with complex geology, completing the detection of the occurrence condition of coal seam gas on a working face to be tunneled, and further determining the range of a high gas occurrence region;
step two, constructing a coal seam pressure relief moving space; a horizontal joint cutting technology is utilized near a coal seam floor, a 60-80MPa super-pressure pump is selected to horizontally scour and cut coal seams on two sides of a spray head through a self-propelled rotary water jet drill bit, a horizontal joint cutting space with a certain width and depth is formed, and the formed horizontal joint cutting space is used as a coal seam pressure relief moving space. The influence radius of hydraulic slotting pressure relief can reach 2.0-2.5 m, which is 2 times of the influence radius of ordinary drilling pressure relief, and the permeability can be improved by 5 times. The ratio of the distance between the coal seam pressure relief moving space and the coal seam floor to the height of the coal seam is 0.15-0.25: 1, and the ratio of the height of the coal seam pressure relief moving space to the height of the coal seam is 0.03-0.1: 1, the ratio of the horizontal width of the compensation space to the horizontal width of the coal roadway is 0.7-0.9: 1;
step three, arranging liquid nitrogen conveying holes; adopting a parallel punching method to construct continuous transverse holes in the coal seam with low air permeability from the middle upper part of the coal seam; the ratio of the distance between the liquid nitrogen conveying holes and the coal seam roof to the height of the coal seam is 0.1-0.3: 1, and the distance between every two adjacent liquid nitrogen conveying holes is 0.4-0.8 m;
step four, liquid nitrogen cold impact; after sealing the hole opening of the liquid nitrogen conveying hole, injecting high-pressure liquid nitrogen into the liquid nitrogen conveying hole by using a cold circulation impact device, wherein the volume of the injected high-pressure liquid nitrogen in the liquid nitrogen conveying hole accounts for 60-85% of the total volume of the liquid nitrogen conveying hole, and standing for 2-3 h; the hole sealing mode is that a hole sealing device is adopted to seal a liquid nitrogen conveying hole, the cold circulation impact device comprises a liquid nitrogen tank, a conveying pipeline, a pulse pump and a vent valve, the vent valve is installed on the conveying pipeline between the liquid nitrogen tank and the pulse pump, and the conveying pipeline at the outlet end of the pulse pump is fixed in the liquid nitrogen conveying hole through the hole sealing device;
in the process, the water-containing coal body is frozen and spalled under the action of liquid nitrogen, and the liquid nitrogen is gasified to generate nitrogen gas, so that gas fracturing is continuously performed on the coal body, and the process of impacting and cold fracturing the coal body is completed. The coal body pore crack water is rapidly frozen in the process of liquid nitrogen heat absorption vaporization, and 9% volume expansion and the frost heaving force of 207Mpa are generated in the process of water ice phase change. The high-pressure gasification expansion force and the frost heaving force generate expansion deformation on the coal body, provide power load for desorption gas and promote the coal body to move downwards. The middle upper part of the coal body provides power load through liquid nitrogen cold impact, a channel crack is formed under the action of destructive energy, an in-layer horizontal space is formed in advance by utilizing a horizontal cutting seam, due to the pressure difference in the coal body, the coal body is loosened under the dual actions of ground stress and dynamic load, the coal body expands and deforms, and moves oppositely between a top plate and a bottom plate, the desorbed gas is pressed by power to accelerate desorption and migration, so that a gas migration compensation space is formed, and the coal body layer crack effect is achieved.
Step five, gas extraction; drilling a plurality of gas extraction holes at equal intervals along the circumferential direction of the liquid nitrogen conveying hole, sealing the pressure-relief moving space of the coal seam, the liquid nitrogen conveying hole and the gas extraction holes by adopting a high-pressure grouting method, respectively arranging gas extraction pipes, and extracting desorbed gas by using a gas extraction device; and after the designed extraction time is reached, the extraction effect is checked.
Further, in the third step, in order to improve the frost heaving effect of the liquid nitrogen on the coal body, after the liquid nitrogen conveying hole is constructed, water vapor is injected into the liquid nitrogen conveying hole, and the amount of the injected water vapor is controlled to be 0.6-0.8L/min; and (3) injecting water vapor into the liquid nitrogen conveying hole, wherein the water vapor is high-pressure water vapor at 120-150 ℃, and stopping injecting the water vapor when the temperature of the coal bed around the liquid nitrogen conveying hole reaches 120 ℃ is detected. By injecting water vapor into the liquid nitrogen conveying hole, the water vapor can enter micro cracks on the hole wall of the liquid nitrogen conveying hole and is condensed into liquid water, and the micro cracks can be effectively widened by volume expansion generated in the water ice phase change process under the action of the liquid nitrogen; moreover, after the coal body is heated by utilizing the vapor, the liquid nitrogen is injected rapidly, on one hand, the coal body can help to form a channel crack in the coal body in the short-term expansion and contraction process, and when the liquid nitrogen meets the coal body with higher temperature, the liquid nitrogen is rapidly gasified into the nitrogen gas, so that the pressure in a liquid nitrogen conveying hole is rapidly increased in the process, the explosion effect can be achieved, and the process is safer.
According to the method, a horizontal kerf surface is pre-cut on a coal seam close to the bottom of the coal seam by utilizing a protective layer mining principle and a hydraulic kerf technology, and a static horizontal groove surface is artificially pre-manufactured; the dynamic and static combination is cooperatively acted on a coal roadway tunneling working face, liquid nitrogen cold impact cracking is carried out in the direction parallel to a joint cutting direction at the middle upper part of a coal seam to provide dynamic load, structural damage is carried out on coal bodies around a hole wall by utilizing frost heaving force and gasification expansion force to generate expansion deformation, the coal bodies are disorderly cracked under the action of damage stress, gas is desorbed seriously, a migration free face compensation space is reserved at the bottom of the coal bodies, the coal bodies move down integrally to promote the deformation of the coal bodies to exceed the inspection requirement that the maximum expansion deformation of a protective layer during mining is larger than 3/1000, the dynamic and static combination acts as a gas migration expansion crack channel, and finally the integral cracking effect of the coal bodies is achieved. According to the invention, the liquid nitrogen fracturing technology and the hydraulic slotting technology are combined for use, so that the coal seam fracture initiation pressure is reduced, fracture expansion and extension are realized, and the gas extraction efficiency is improved.
In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, are merely for convenience of description of the present invention, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.
Claims (9)
1. A gas permeability increasing method under the action of dynamic and static combination of a coal roadway driving face is characterized by comprising the following steps:
step one, determining a high gas occurrence area; according to coal mine geological survey, combining a geophysical prospecting technology to avoid a coal seam region with complex geology, completing the detection of the occurrence condition of coal seam gas on a working face to be tunneled, and further determining the range of a high gas occurrence region;
step two, constructing a coal seam pressure relief moving space; horizontally cutting the coal seam by using a horizontal joint cutting technology at a position close to the bottom plate of the coal seam, wherein the formed horizontal slot opening space is used as a pressure relief moving space of the coal seam;
step three, arranging liquid nitrogen conveying holes; adopting a parallel punching method to construct continuous transverse holes in the coal seam with low air permeability from the middle upper part of the coal seam;
step four, liquid nitrogen cold impact; after sealing the hole opening of the liquid nitrogen conveying hole, injecting high-pressure liquid nitrogen into the liquid nitrogen conveying hole by using a cold circulation impact device, and standing for 2-3 hours;
and fifthly, gas extraction.
2. The gas permeability increasing method with the combined action of the moving part and the static part of the coal roadway driving face according to claim 1, wherein in the second step, the ratio of the distance between the pressure relief moving space of the coal seam and the bottom plate of the coal seam to the height of the coal seam is 0.15-0.25: 1, and the ratio of the height of the pressure relief moving space of the coal seam to the height of the coal seam is 0.03-0.1: 1, the ratio of the horizontal width of the compensation space to the horizontal width of the coal roadway is 0.7-0.9: 1.
3. The gas permeability increasing method of the coal roadway heading face dynamic-static combined action according to claim 1, wherein in the third step, the ratio of the distance from the liquid nitrogen conveying hole to the coal seam roof to the height of the coal seam is 0.1-0.3: 1, and the distance between two adjacent liquid nitrogen conveying holes is 0.4-0.8 m.
4. The gas permeability increasing method of the coal roadway heading face dynamic-static combined action according to claim 3, characterized in that in the third step, after the construction of the liquid nitrogen conveying hole is completed, steam is injected into the liquid nitrogen conveying hole, and the amount of the injected steam is controlled to be 0.6-0.8L/min.
5. The gas permeability increasing method under the combined action of dynamic and static of the coal roadway driving face according to claim 4, wherein in the third step, the steam injected into the liquid nitrogen conveying hole is high-pressure steam with the temperature of 120-150 ℃, and the steam injection is stopped when the temperature of the coal seam around the liquid nitrogen conveying hole reaches 120 ℃.
6. The gas permeability increasing method of the coal roadway heading face dynamic-static combined action according to claim 1, wherein in the fourth step, the hole sealing mode is to use a hole sealing machine to seal the liquid nitrogen conveying hole.
7. The gas permeability increasing method of the coal roadway heading face dynamic-static combined action according to claim 6, wherein in the fourth step, the volume of high-pressure liquid nitrogen injected into the liquid nitrogen conveying holes accounts for 60-85% of the total volume of the liquid nitrogen conveying holes.
8. The method for increasing the gas permeability of the coal roadway heading face under the action of the combination of static and dynamic gas components according to claim 7, wherein in the fourth step, the cold circulation impact device comprises a liquid nitrogen tank, a conveying pipeline, a pulse pump and a vent valve, the vent valve is installed on the conveying pipeline between the liquid nitrogen tank and the pulse pump, and the conveying pipeline at the outlet end of the pulse pump is fixed in a liquid nitrogen conveying hole through a hole packer.
9. The gas permeability increasing method of the coal roadway heading face with the combined action of moving and static electricity according to claim 1, characterized in that in the fifth step, a plurality of gas extraction holes are drilled at equal intervals along the circumferential direction of the liquid nitrogen conveying hole, the pressure relief moving space of the coal seam, the liquid nitrogen conveying hole and the gas extraction holes are sealed by a high-pressure grouting method, gas extraction pipes are respectively arranged, and the desorbed gas is extracted by a gas extraction device; and after the designed extraction time is reached, the extraction effect is checked.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210553065.3A CN114810197B (en) | 2022-05-19 | 2022-05-19 | Gas permeability increasing method for coal roadway driving face dynamic and static combined action |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210553065.3A CN114810197B (en) | 2022-05-19 | 2022-05-19 | Gas permeability increasing method for coal roadway driving face dynamic and static combined action |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114810197A true CN114810197A (en) | 2022-07-29 |
| CN114810197B CN114810197B (en) | 2022-10-25 |
Family
ID=82517732
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210553065.3A Active CN114810197B (en) | 2022-05-19 | 2022-05-19 | Gas permeability increasing method for coal roadway driving face dynamic and static combined action |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114810197B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115573764A (en) * | 2022-11-23 | 2023-01-06 | 中国矿业大学(北京) | Ultrasonic secondary impact pressing and pumping integrated gas concentration device and method |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101614133A (en) * | 2009-07-14 | 2009-12-30 | 中国矿业大学 | High pressure jet drilling and slotting integration pressure-release anti-burst method |
| CN102635388A (en) * | 2012-02-24 | 2012-08-15 | 煤炭科学研究总院沈阳研究院 | Interaction permeability-increasing method of pre-splitting blasting and hydraulic cracking of coal seam |
| CA2840118A1 (en) * | 2011-06-24 | 2012-12-27 | Ian Gray | Mining method for gassy and low permeability coal seams |
| CN105971663A (en) * | 2016-07-19 | 2016-09-28 | 淮南宏昌科技有限责任公司 | Drill hole arrangement structure and permeability-increasing method for coal seam high-pressure waterpower slotted fracturing |
| CN108180002A (en) * | 2017-12-29 | 2018-06-19 | 中煤科工集团重庆研究院有限公司 | A kind of coal mine underground coal bed waterpower pressure-cut coupling anti-reflection method |
| CN111287702A (en) * | 2020-02-20 | 2020-06-16 | 中国矿业大学 | Coal bed permeability increasing method with ice particle abrasive jet flow slotting and microwave heat injection in cooperation |
| CN112901118A (en) * | 2021-03-18 | 2021-06-04 | 山东科技大学 | Method for hydraulic seam cutting, liquid nitrogen frost heaving and blasting combined permeability-increasing coal seam |
| CN112983418A (en) * | 2021-04-14 | 2021-06-18 | 中国矿业大学 | Method for hydraulic fracturing pressure relief of coal mine underground coal face withdrawal channel |
| CN113153296A (en) * | 2021-03-17 | 2021-07-23 | 徐州工程学院 | Method for rock cross-cut coal uncovering through linkage of hydraulic slotting and hot-cold cycle impact |
| CN113847082A (en) * | 2021-09-24 | 2021-12-28 | 贵州大学 | Method for enhancing coal seam fracturing and extraction effects by ultrasonic field |
-
2022
- 2022-05-19 CN CN202210553065.3A patent/CN114810197B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101614133A (en) * | 2009-07-14 | 2009-12-30 | 中国矿业大学 | High pressure jet drilling and slotting integration pressure-release anti-burst method |
| CA2840118A1 (en) * | 2011-06-24 | 2012-12-27 | Ian Gray | Mining method for gassy and low permeability coal seams |
| CN102635388A (en) * | 2012-02-24 | 2012-08-15 | 煤炭科学研究总院沈阳研究院 | Interaction permeability-increasing method of pre-splitting blasting and hydraulic cracking of coal seam |
| CN105971663A (en) * | 2016-07-19 | 2016-09-28 | 淮南宏昌科技有限责任公司 | Drill hole arrangement structure and permeability-increasing method for coal seam high-pressure waterpower slotted fracturing |
| CN108180002A (en) * | 2017-12-29 | 2018-06-19 | 中煤科工集团重庆研究院有限公司 | A kind of coal mine underground coal bed waterpower pressure-cut coupling anti-reflection method |
| CN111287702A (en) * | 2020-02-20 | 2020-06-16 | 中国矿业大学 | Coal bed permeability increasing method with ice particle abrasive jet flow slotting and microwave heat injection in cooperation |
| CN113153296A (en) * | 2021-03-17 | 2021-07-23 | 徐州工程学院 | Method for rock cross-cut coal uncovering through linkage of hydraulic slotting and hot-cold cycle impact |
| CN112901118A (en) * | 2021-03-18 | 2021-06-04 | 山东科技大学 | Method for hydraulic seam cutting, liquid nitrogen frost heaving and blasting combined permeability-increasing coal seam |
| CN112983418A (en) * | 2021-04-14 | 2021-06-18 | 中国矿业大学 | Method for hydraulic fracturing pressure relief of coal mine underground coal face withdrawal channel |
| CN113847082A (en) * | 2021-09-24 | 2021-12-28 | 贵州大学 | Method for enhancing coal seam fracturing and extraction effects by ultrasonic field |
Non-Patent Citations (2)
| Title |
|---|
| 宋维源等: "水力割缝增透抽采煤层瓦斯原理及应用", 《中国安全科学学报》 * |
| 李普: "穿层钻孔预抽煤层瓦斯水力增透关键技术研究", 《能源技术与管理》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115573764A (en) * | 2022-11-23 | 2023-01-06 | 中国矿业大学(北京) | Ultrasonic secondary impact pressing and pumping integrated gas concentration device and method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114810197B (en) | 2022-10-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103953343B (en) | A kind of method coal seam tight roof being controlled to caving | |
| CN104879159B (en) | A kind of devices and methods therefor of weak seam stope anti-reflection mash gas extraction | |
| CN112593936B (en) | Advanced comprehensive control method for multi-disaster area of deep mine | |
| CN102322245B (en) | Gas hydrate exploitation device | |
| CN102383828A (en) | Refection reducing and outburst eliminating method for deep-hole hydraulic fracture driving gas shallow hole extraction | |
| CN106089291B (en) | A kind of method for cooperateing with extraction to be caving the old dead zone of formula and lower coal seam coal bed gas | |
| CN106869966B (en) | A kind of method for blocking of absciss layer water supply source | |
| CN105064967A (en) | Coal seam gas fracturing and mash gas driving method | |
| CN107120137B (en) | A kind of coal roadway tunneling is along seat earth Deephole pre-splitting blasting pumping method | |
| CN110173264A (en) | Lane bump method is stayed with conventional release prevention and treatment tight roof in disconnected top | |
| CN111441817B (en) | Method for reinforcing gas extraction by synergistic effect of coal seam drilling jet fracturing and mining pressure | |
| CN114810197B (en) | Gas permeability increasing method for coal roadway driving face dynamic and static combined action | |
| CN108301866A (en) | Mining of closed distance coal seam group adjacent layer gas pressure relief directional drilling stops pumping method | |
| CN114396244B (en) | Method for extracting gas by up-and-down combined permeability-increasing of deep coal seam group well | |
| CN102493831A (en) | Method for extracting coal seam gas through ground fracturing and underground horizontal drill holes | |
| CN110173238A (en) | The anti-reflection extraction of high seam three-dimensional roadway layout networking explosion thick gas method entirely | |
| CN112412417A (en) | The coal seam hydraulic power cave-making combined drilling heat injection permeability-increasing pumping-promoting method | |
| CN105927192B (en) | A kind of method for being caving the old dead zone of formula and lower coal seam coal bed gas unitized production | |
| CN105971563B (en) | A kind of lower part tool post method exploits the pumping method for the compound old dead zone coal bed gas to be formed | |
| CN103061732A (en) | Hydraulic fracturing method of 2-3 meter hard medium sandstone stratum of roof of coal seam | |
| CN114810005B (en) | Coal seam fracturing method under coal roadway horizontal joint cutting-carbon dioxide blasting synergistic effect | |
| CN111894528B (en) | Coal measure stratum multi-gas combined mining and capacity replacing method | |
| CN102797448B (en) | Retreating sectional type hydraulic cracking method | |
| US20230160305A1 (en) | Coal bump control method for sectional hydraulic fracturing regions of near vertical ultra thick coal seam | |
| CN112412422A (en) | Freezing fracturing cooperated coal seam hydraulic cavitation permeability increasing and pumping promoting method |
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 | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |