CN107120087B - Coal bed supercritical carbon dioxide plugging device and method - Google Patents
Coal bed supercritical carbon dioxide plugging device and method Download PDFInfo
- Publication number
- CN107120087B CN107120087B CN201710243106.8A CN201710243106A CN107120087B CN 107120087 B CN107120087 B CN 107120087B CN 201710243106 A CN201710243106 A CN 201710243106A CN 107120087 B CN107120087 B CN 107120087B
- Authority
- CN
- China
- Prior art keywords
- end hole
- carbon dioxide
- supercritical carbon
- sealing device
- sealer
- 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.)
- Active
Links
Images
Classifications
-
- 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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
Abstract
The invention discloses a coal seam supercritical carbon dioxide plugging device and a method, wherein the device comprises a front-end hole sealer, a rear-end hole sealer, a grouting pipe, a supercritical carbon dioxide injection pipe and a temperature controller, wherein the front-end hole sealer consists of a metal end head of the front-end hole sealer, a front-end hole sealer heating device, a front-end hole sealer capsule and a front-end hole sealer water injection pipe; the rear end hole sealing device consists of a rear end hole sealing device capsule and a rear end hole sealing device water injection pipe; the front end hole sealing device and the rear end hole sealing device are connected with a supercritical carbon dioxide injection pipe through a quick sealing joint, and the supercritical carbon dioxide injection pipe is connected with a supercritical carbon dioxide gas source; a grouting pipe is arranged between the front end hole sealing device capsule and the rear end hole sealing device capsule; the water injection pipe is connected with a high-pressure water source. The plugging method has high reliability and good plugging effect; the high-efficiency plugging of the supercritical carbon dioxide in the coal bed is realized, the carbon dioxide injected into the drill hole is ensured to be in a supercritical state, and the popularization and the application of the supercritical carbon dioxide in the yield increase of the coal bed gas are facilitated.
Description
Technical Field
The invention relates to a device and a method for plugging supercritical carbon dioxide in a coal bed, and belongs to the technical field of high-efficiency exploitation of coal bed methane.
Background
Coal bed gas is an unconventional natural gas and also a 'first killer' in the coal development process. The development and utilization of the coal bed gas belong to the important components of the national clean, efficient, safe and sustainable modern energy system. However, the geological conditions of coal beds in China are very complex, and the coal bed gas is difficult to extract due to the characteristics of microporosity, low permeability and high adsorption of most coal beds, so that the utilization efficiency of the coal bed gas resources is low. In recent years, with the increasing mining depth, the frequency and intensity of gas disasters are further increased due to the high ground stress and high gas gradient of deep coal seams. The high-efficiency extraction of the coal bed gas has important significance in the future coal and gas co-extraction in China. At present, gas injection displacement is carried out on a coal seam, and the method is also an effective method for increasing the yield of the coal seam gas. While such methods have good cost and adaptability advantages, the selection, use and installation of gaseous media is not complete. In various gases, because supercritical carbon dioxide has the characteristics of density close to liquid, viscosity close to gas and diffusion coefficient far greater than that of liquid, the use of supercritical carbon dioxide for permeability increase and displacement becomes a hotspot of high-efficiency coal bed gas exploitation research in recent years. However, the supercritical state of the gas is difficult to maintain, and an effective plugging device and method are lacked in the application of a coal mine site, so that the development of the supercritical carbon dioxide plugging device and method for the coal bed has important significance for popularization and application of the technology in yield increase of the coal bed gas.
Disclosure of Invention
The invention aims to provide a device and a method for plugging supercritical carbon dioxide in a coal bed, which have the advantages of simple structure, convenience in operation, low cost and strong practicability.
The invention provides a coal seam supercritical carbon dioxide plugging device which comprises a front-end hole sealer, a rear-end hole sealer, a grouting pipe, a supercritical carbon dioxide injection pipe and a temperature controller, wherein the front-end hole sealer consists of a metal end of the front-end hole sealer, a front-end hole sealer heating device, a front-end hole sealer capsule and a front-end hole sealer water injection pipe; the rear end hole sealing device consists of a rear end hole sealing device capsule and a rear end hole sealing device water injection pipe; the front end hole sealing device and the rear end hole sealing device are connected with a supercritical carbon dioxide injection pipe through a quick sealing joint, and the supercritical carbon dioxide injection pipe is connected with a supercritical carbon dioxide gas source; a grouting pipe is arranged between the front end hole sealing device capsule and the rear end hole sealing device capsule and is connected with a grouting pump; the front end hole packer water injection pipe and the rear end hole packer water injection pipe are respectively connected with a high-pressure water source.
In the device, the heating device of the front end hole sealing device comprises a temperature sensor and an electric heating wire, and the electric heating wire is connected with a temperature controller through a control line of the front end hole sealing device.
The invention provides a coal bed supercritical carbon dioxide plugging method, which comprises the following steps:
a. drilling according to a coal mine site design scheme, and drilling in a coal seam; different coal seam conditions cause different drill hole depths in the design scheme;
b. after the drilling construction is completed, assembling the coal bed supercritical carbon dioxide plugging device: connecting a front-end hole sealer and a rear-end hole sealer with a supercritical carbon dioxide injection pipe through quick sealing joints, installing a grouting pipe between a front-end hole sealer capsule and a rear-end hole sealer capsule, connecting a front-end hole sealer control line with a temperature controller, respectively connecting the front-end hole sealer water injection pipe and the rear-end hole sealer water injection pipe with a high-pressure water source, connecting the supercritical carbon dioxide injection pipe with a supercritical carbon dioxide gas source, and connecting the grouting pipe with a grouting pump;
c. closing the first valve, the second valve, the third valve and the fourth valve, and conveying the assembled coal bed supercritical carbon dioxide plugging device into a designed position in a drill hole;
d. opening a first valve and a second valve, respectively injecting high-pressure water into the front end hole sealing device capsule and the rear end hole sealing device capsule, and respectively closing the first valve and the second valve when the first pressure gauge and the second pressure gauge display that the pressure is 4.0-6.0 MPa;
e. opening a fourth valve, sending the plugging slurry into a space between a front-end hole sealing device capsule and a rear-end hole sealing device capsule through a grouting pipe, and closing the fourth valve when a fourth pressure gauge displays that the pressure is 0.5-2.0 MPa;
f. starting a temperature controller to enable a heating wire in a heating device of the front end hole sealing device to heat a metal end of the front end hole sealing device, and adjusting the temperature controller to maintain the temperature constant when the temperature displayed by the temperature controller is higher than 35 ℃ to enable the temperature in the drill hole to reach the temperature required by supercritical carbon dioxide;
g. opening a third valve, injecting supercritical carbon dioxide into the drill hole through a supercritical carbon dioxide injection pipe, and monitoring a third pressure gauge in real time to ensure that the injection pressure of the supercritical carbon dioxide is not less than 7.5 MPa;
h. step g lasts for a period of time set according to the actual requirements. Different coal seams have different pore structures in the coal seams due to different occurrence characteristics, so that the injection amount of the supercritical carbon dioxide is different, the time is different, and the setting is needed according to actual requirements.
In the method, the drilling is the drilling or the through-layer drilling of the coal seam. The drilling hole is not only limited to the coal seam drilling hole, but also is suitable for plugging the supercritical carbon dioxide in the cross-layer drilling hole.
The invention has the beneficial effects that:
the plugging device provided by the invention can realize the efficient plugging of the supercritical carbon dioxide in the coal bed, and simultaneously ensure that the carbon dioxide injected into the drill hole is maintained in a supercritical state; the capsule hole packer injected with the pressure water can generate stronger friction force with the wall of a drill hole, and effectively resist the thrust generated by injecting the supercritical carbon dioxide to the hole packer; pressure slurry injected between the hole packers can permeate into the wall surface of the drilled hole, so that a fracture network around the drilled hole can be efficiently sealed, active sealing of solid sealing liquid and liquid sealing gas is realized, and the loss of supercritical carbon dioxide is effectively prevented; the electric heating wire in the heating device of the front end hole sealing device can heat the metal end of the front end hole sealing device to increase the temperature in the drill hole; a temperature controller in the apparatus can monitor and regulate the temperature in the borehole, maintain the carbon dioxide in the borehole at a constant temperature of greater than 35 ℃, and maintain the carbon dioxide in a supercritical state. The plugging method provided by the invention is easy to operate, high in reliability and good in plugging effect, and has wide practicability in the field of supercritical carbon dioxide plugging of coal seams in coal mines.
Drawings
Fig. 1 is a schematic structural diagram of a supercritical carbon dioxide plugging device for a coal seam.
In the figure: 1-coal bed; 2, drilling; 3-front end hole sealing machine metal end; 4-front end hole sealing device heating device; 5-front end hole sealing machine capsule; 6-front end hole sealing device control line; 7-water injection pipe of front end hole packer; 8-grouting pipe; 9-rear end hole sealing machine capsule; 10-a water injection pipe of a rear end hole packer; 11-a first valve; 12-a first pressure gauge; 13-a second valve; 14-a second pressure gauge; 15-a third pressure gauge; 16-a third valve; 17-a supercritical carbon dioxide injection tube; 18-a fourth pressure gauge; 19-a fourth valve; 20-temperature controller.
Detailed Description
The present invention is further illustrated by, but is not limited to, the following examples.
Example 1:
as shown in fig. 1, the coal seam supercritical carbon dioxide plugging device of the present invention mainly includes a front end hole sealing device, a rear end hole sealing device, a grouting pipe 8, a supercritical carbon dioxide injection pipe 17, and a temperature controller 20. The front-end hole sealer is used for plugging a drill hole 2 and keeping the temperature in the drill hole 2 and consists of a metal end head 3 of the front-end hole sealer, a heating device 4 of the front-end hole sealer, a capsule 5 of the front-end hole sealer and a water injection pipe 7 of the front-end hole sealer; the front end hole sealing device heating device 4 comprises a temperature sensor and an electric heating wire, is connected with a temperature controller 20 through a front end hole sealing device control line 6 and is used for monitoring, generating and adjusting the temperature of the drill hole 2; the front end hole sealer capsule 5 is connected with a high-pressure water source through a front end hole sealer water injection pipe 7, and a second valve 13 and a second pressure gauge 14 are sequentially installed on the front end hole sealer water injection pipe 7. The rear end hole sealing device is used for sealing the drill hole 2 and consists of a rear end hole sealing device capsule 9 and a rear end hole sealing device water injection pipe 10; the rear end hole packer capsule 9 is connected with a high-pressure water source through a rear end hole packer water injection pipe 10, and a first valve 11 and a first pressure gauge 12 are sequentially installed on the rear end hole packer water injection pipe 10. The front end hole sealing device and the rear end hole sealing device are connected with the supercritical carbon dioxide injection pipe 17 through a quick sealing joint; and a third valve 16 and a third pressure gauge 15 are sequentially arranged on the supercritical carbon dioxide injection pipe 17 and used for adjusting and monitoring the injection pressure of the supercritical carbon dioxide. A grouting pipe 8 is arranged between the front end hole sealing device capsule 5 and the rear end hole sealing device capsule 9 and is used for injecting liquid into the drill hole 2; and a fourth valve 19 and a fourth pressure gauge 18 are sequentially arranged on the grouting pipe 8 and used for adjusting and monitoring the grouting pressure of the grout.
The method for plugging the supercritical carbon dioxide in the coal bed by adopting the device comprises the following steps:
a. drilling is carried out according to a coal mine site design scheme, and by taking the coal seam drilling as an example, a drilling hole 2 is arranged in a coal seam 1 perpendicular to a coal wall;
b. after the construction of the drilling hole 2 is completed, assembling the supercritical carbon dioxide plugging device of the coal bed: connecting a front-end hole sealer and a rear-end hole sealer together with a supercritical carbon dioxide injection pipe 17 by using quick sealing joints, installing a grouting pipe 8 between a front-end hole sealer capsule 5 and a rear-end hole sealer capsule 9, connecting a front-end hole sealer control line 6 with a temperature controller 20, connecting a front-end hole sealer water injection pipe 7 and a rear-end hole sealer water injection pipe 10 with a high-pressure water source respectively, connecting the supercritical carbon dioxide injection pipe 17 with a supercritical carbon dioxide gas source, and connecting the grouting pipe 8 with a grouting pump;
c. closing the first valve 11, the second valve 13, the third valve 16 and the fourth valve 19, and feeding the assembled coal bed supercritical carbon dioxide plugging device into the designed position in the drill hole 2;
d. opening a first valve 11 and a second valve 13, respectively injecting high-pressure water into the front end hole sealing device capsule 5 and the rear end hole sealing device capsule 9, and respectively closing the first valve 11 and the second valve 13 when the first pressure gauge 12 and the second pressure gauge 14 show that the pressure is 4.0-6.0 MPa;
e. opening a fourth valve 19, sending the plugging slurry into a space between the front-end hole sealing device capsule 5 and the rear-end hole sealing device capsule 9 through a grouting pipe 8, and closing the fourth valve 19 when a fourth pressure gauge 18 displays that the pressure is 0.5-2.0 MPa;
f. starting the temperature controller 20 to enable the electric heating wire in the heating device 4 of the front end hole sealing device to heat the metal end 3 of the front end hole sealing device, and adjusting the temperature controller 20 to maintain the temperature constant when the temperature displayed by the temperature controller 20 is higher than 35 ℃ to enable the temperature in the drill hole to reach the temperature required by the supercritical carbon dioxide;
g. opening a third valve 16, injecting supercritical carbon dioxide into the drill hole 2 through a supercritical carbon dioxide injection pipe 17, monitoring a third pressure gauge 15 in real time, and ensuring that the injection pressure of the supercritical carbon dioxide is not less than 7.5 MPa;
h. step g lasts for a certain time, which is set according to actual requirements.
The attached drawing of the invention is to take the coal seam drilling as an example, but the invention is not limited by the drilling construction mode, and the invention is obviously also suitable for plugging the supercritical carbon dioxide in the cross-layer drilling.
Claims (3)
1. The utility model provides a coal seam supercritical carbon dioxide plugging device which characterized in that: the device comprises a front-end hole sealer, a rear-end hole sealer, a grouting pipe (8), a supercritical carbon dioxide injection pipe (17) and a temperature controller (20), wherein the front-end hole sealer consists of a front-end hole sealer metal end (3), a front-end hole sealer heating device (4), a front-end hole sealer capsule (5) and a front-end hole sealer water injection pipe (7); the rear end hole sealing device consists of a rear end hole sealing device capsule (9) and a rear end hole sealing device water injection pipe (10); the front end hole sealing device and the rear end hole sealing device are connected with a supercritical carbon dioxide injection pipe (17) through a quick sealing joint, and the supercritical carbon dioxide injection pipe is connected with a supercritical carbon dioxide gas source; a grouting pipe (8) is arranged between the front-end hole sealing device capsule (5) and the rear-end hole sealing device capsule (9), and the grouting pipe is connected with a grouting pump; the front end hole packer water injection pipe (7) and the rear end hole packer water injection pipe (10) are respectively connected with a high-pressure water source;
the heating device (4) of the front end hole sealing device comprises a temperature sensor and an electric heating wire, and the electric heating wire is connected with a temperature controller (20) through a control line (6) of the front end hole sealing device; the electric heating wire in the heating device of the front end hole sealing device can heat the metal end of the front end hole sealing device and increase the temperature in the drill hole; the temperature controller can monitor and adjust the temperature in the drill hole, the electric heating wire in the heating device (4) of the front end hole sealing device heats the metal end head (3) of the front end hole sealing device, and when the temperature displayed by the temperature controller (20) is higher than 35 ℃, the temperature controller (20) is adjusted to maintain the temperature constant, so that the temperature required by the supercritical carbon dioxide in the drill hole is reached; the temperature controller (20) maintains the carbon dioxide in the borehole at a constant temperature greater than 35 ℃ and in a supercritical state.
2. A coal bed supercritical carbon dioxide plugging method adopts the coal bed supercritical carbon dioxide plugging device of claim 1, and is characterized in that: the method comprises the following steps:
a. drilling according to a coal mine site design scheme, and constructing a drill hole (2) in a coal seam (1);
b. after the construction of the drilling hole (2) is completed, assembling the coal bed supercritical carbon dioxide plugging device: connecting a front-end hole sealer and a rear-end hole sealer together with a supercritical carbon dioxide injection pipe (17) by using quick sealing joints, installing a grouting pipe (8) between a front-end hole sealer capsule (5) and a rear-end hole sealer capsule (9), connecting a front-end hole sealer control line (6) with a temperature controller (20), respectively connecting a front-end hole sealer water injection pipe (7) and a rear-end hole sealer water injection pipe (10) with a high-pressure water source, connecting the supercritical carbon dioxide injection pipe (17) with a supercritical carbon dioxide gas source, and connecting the grouting pipe (8) with a grouting pump;
c. closing the first valve (11), the second valve (13), the third valve (16) and the fourth valve (19), and conveying the assembled coal bed supercritical carbon dioxide plugging device to a designed position in the drill hole (2);
d. opening a first valve (11) and a second valve (13), respectively injecting high-pressure water into the front-end hole sealing device capsule (5) and the rear-end hole sealing device capsule (9), and respectively closing the first valve (11) and the second valve (13) when the first pressure gauge (12) and the second pressure gauge (14) display that the pressure is 4.0-6.0 MPa;
e. opening a fourth valve (19), sending the plugging slurry into a space between a front end hole sealing device capsule (5) and a rear end hole sealing device capsule (9) through a grouting pipe (8), and closing the fourth valve (19) when a fourth pressure gauge (18) displays that the pressure is 0.5-2.0 MPa;
f. starting the temperature controller (20) to enable the electric heating wire in the heating device (4) of the front end hole sealing device to heat the metal end head (3) of the front end hole sealing device, and adjusting the temperature controller (20) to maintain the temperature constant when the temperature displayed by the temperature controller (20) is higher than 35 ℃ to enable the temperature in the drill hole to reach the temperature required by the supercritical carbon dioxide;
g. opening a third valve (16), injecting supercritical carbon dioxide into the drill hole (2) through a supercritical carbon dioxide injection pipe (17), monitoring a third pressure gauge (15) in real time, and ensuring that the injection pressure of the supercritical carbon dioxide is not less than 7.5 MPa;
h. step g lasts for a period of time set according to the actual requirements.
3. The coal seam supercritical carbon dioxide plugging method according to claim 2, characterized in that: the drilling holes refer to the coal seam drilling holes or through-layer drilling holes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710243106.8A CN107120087B (en) | 2017-04-14 | 2017-04-14 | Coal bed supercritical carbon dioxide plugging device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710243106.8A CN107120087B (en) | 2017-04-14 | 2017-04-14 | Coal bed supercritical carbon dioxide plugging device and method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107120087A CN107120087A (en) | 2017-09-01 |
| CN107120087B true CN107120087B (en) | 2020-04-21 |
Family
ID=59724696
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710243106.8A Active CN107120087B (en) | 2017-04-14 | 2017-04-14 | Coal bed supercritical carbon dioxide plugging device and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107120087B (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108798669B (en) * | 2018-05-04 | 2020-09-04 | 中国矿业大学 | Deep hole loosening hydraulic pressure relief integrated blasting method and device |
| CN110172966A (en) * | 2019-05-23 | 2019-08-27 | 上海长凯岩土工程有限公司 | A kind of oblique steel pipe composite structure forms the construction method of beaer |
| CN110219615B (en) * | 2019-05-31 | 2021-11-05 | 山东科技大学 | Coal seam pulsating water injection drilling hole sealing device and hole sealing method |
| CN111058839B (en) * | 2019-12-13 | 2022-06-28 | 太原理工大学 | Working face goaf fractured zone drilling air permeability segmented testing device and testing method |
| CN111155960B (en) * | 2020-01-08 | 2022-11-01 | 太原理工大学 | Coal seam gas extraction drilling and sealing method based on MICP technology |
| CN111561291B (en) * | 2020-05-06 | 2022-04-08 | 太原理工大学 | Double-layer extrusion type hole sealing device and method for gas extraction drill hole |
| CN113216837B (en) * | 2021-05-17 | 2022-01-14 | 河海大学 | Supercritical fluid drilling and blasting integrated double-arm rock drilling trolley and control method thereof |
| CN115387755B (en) * | 2022-08-09 | 2023-06-30 | 中国石油大学(华东) | CO (carbon monoxide) 2 Temporary plugging method for leakage along fault during geological storage |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4615389A (en) * | 1984-10-25 | 1986-10-07 | Shell Oil Company | Method of producing supercritical carbon dioxide from wells |
| WO2011146082A2 (en) * | 2010-05-21 | 2011-11-24 | Univeristy Of Utah Research Foundation | Methods and systems for co2 sequestration |
| CN103867166A (en) * | 2014-04-01 | 2014-06-18 | 中国石油大学(华东) | Device and method for supercritical carbon dioxide high-pressure jet flow plug removal seepage enhancement |
| CN104295276A (en) * | 2014-07-29 | 2015-01-21 | 太原理工大学 | Method for improving coalbed methane collection rate |
| CN104632174A (en) * | 2014-12-29 | 2015-05-20 | 西安科技大学 | Coal seam liquid carbon dioxide fracturing device and method |
| CN104777269A (en) * | 2015-03-24 | 2015-07-15 | 中国矿业大学 | Supercritical CO2 injection and coalbed methane enhanced displacement simulation test method |
| CN205225179U (en) * | 2015-12-23 | 2016-05-11 | 淮北科奥工程建设有限公司 | Multilayer bag pocket type hole packer |
| CN205330611U (en) * | 2016-01-21 | 2016-06-22 | 淮南久辉工贸有限责任公司 | Mining hole packer |
| CN106285604A (en) * | 2016-11-01 | 2017-01-04 | 中国矿业大学 | A kind of microwave-assisted supercritical carbon dioxide circulation frac system and method |
-
2017
- 2017-04-14 CN CN201710243106.8A patent/CN107120087B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4615389A (en) * | 1984-10-25 | 1986-10-07 | Shell Oil Company | Method of producing supercritical carbon dioxide from wells |
| WO2011146082A2 (en) * | 2010-05-21 | 2011-11-24 | Univeristy Of Utah Research Foundation | Methods and systems for co2 sequestration |
| CN103867166A (en) * | 2014-04-01 | 2014-06-18 | 中国石油大学(华东) | Device and method for supercritical carbon dioxide high-pressure jet flow plug removal seepage enhancement |
| CN104295276A (en) * | 2014-07-29 | 2015-01-21 | 太原理工大学 | Method for improving coalbed methane collection rate |
| CN104632174A (en) * | 2014-12-29 | 2015-05-20 | 西安科技大学 | Coal seam liquid carbon dioxide fracturing device and method |
| CN104777269A (en) * | 2015-03-24 | 2015-07-15 | 中国矿业大学 | Supercritical CO2 injection and coalbed methane enhanced displacement simulation test method |
| CN205225179U (en) * | 2015-12-23 | 2016-05-11 | 淮北科奥工程建设有限公司 | Multilayer bag pocket type hole packer |
| CN205330611U (en) * | 2016-01-21 | 2016-06-22 | 淮南久辉工贸有限责任公司 | Mining hole packer |
| CN106285604A (en) * | 2016-11-01 | 2017-01-04 | 中国矿业大学 | A kind of microwave-assisted supercritical carbon dioxide circulation frac system and method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107120087A (en) | 2017-09-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107120087B (en) | Coal bed supercritical carbon dioxide plugging device and method | |
| CN201687513U (en) | Underground borehole hydraulic fracturing system | |
| CN102996159B (en) | Multiphase medium plugging device and method for gas extraction drill hole | |
| CN108397182B (en) | Device and method for enhancing permeability of coal seam through electric pulse and liquid nitrogen freeze thawing | |
| CN105822341B (en) | A kind of hypotonic anti-reflection system and method for coal seam supercritical carbon dioxide | |
| CN106988719B (en) | Anti-reflection system and anti-reflection method for circularly injecting hot water and liquid nitrogen into coal seam | |
| CN103195390B (en) | The nearly horizontal mash gas pumping drilling encapsulating method in this coal seam a kind of | |
| CN101539011B (en) | Fire flood eclectic ignition device | |
| CN107816340B (en) | Process method for thermally extracting shale gas by combining high-power ultrasonic waves with branch horizontal well | |
| CN106285681A (en) | A kind of hard coal seam top board fracturing device and method | |
| CN105422164A (en) | Efficient water injection method and device of hydraulic fracture permeability increase auxiliary coal seam | |
| CN102937011A (en) | Secondary grouting and plugging device and method of regional crack field of gas extraction and drilling group | |
| CN104314607A (en) | Method for increasing coal seam drilling gas extraction concentration in multiple stages | |
| CN105370256A (en) | Method for increasing wetting radius of high-pressure water injection of low-air-permeability coal seams through sectioned pre-splitting | |
| CN101915086B (en) | Coal mine underground gas borehole fracturing method | |
| CN111236917A (en) | Complete equipment and method for coal rock water-acid high-pressure presplitting softening scour prevention and permeability increase | |
| CN104612640A (en) | Underground coal mine drilling, heat injection and hole sealing integration method | |
| CN111911225B (en) | Drilling and water injection integrated device and method for coal seam | |
| CN105201483A (en) | Environment-friendly downhole stratum fracturing method | |
| CN108756883A (en) | A kind of coal mine tight roof slip casting fracturing process and system | |
| CN115492557B (en) | Deep non-recoverable coal seam CO 2 Sealing and storing device and method for extracting coalbed methane under negative pressure | |
| CN104481452B (en) | A kind of frequency conversion pulsating inlet well method for sealing | |
| CN203271702U (en) | Fracturing pipe in down hole hydraulic fracturing high-pressure seal hole | |
| CN108533223A (en) | A kind of underground goaf residual coal bed gas methane drainage and utilization project system | |
| CN103541679A (en) | Method for sealing underground hydraulic fracture drilled hole of coal mine in combined manner |
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 |