CN111472832B - Coal bed gas self-circulation gas injection yield increasing method - Google Patents

Coal bed gas self-circulation gas injection yield increasing method Download PDF

Info

Publication number
CN111472832B
CN111472832B CN202010273790.6A CN202010273790A CN111472832B CN 111472832 B CN111472832 B CN 111472832B CN 202010273790 A CN202010273790 A CN 202010273790A CN 111472832 B CN111472832 B CN 111472832B
Authority
CN
China
Prior art keywords
gas
extraction
valve
pipe
coal seam
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
Application number
CN202010273790.6A
Other languages
Chinese (zh)
Other versions
CN111472832A (en
Inventor
刘厅
林柏泉
赵洋
朱传杰
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
China University of Mining and Technology CUMT
Original Assignee
China University of Mining and Technology CUMT
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by China University of Mining and Technology CUMT filed Critical China University of Mining and Technology CUMT
Priority to CN202010273790.6A priority Critical patent/CN111472832B/en
Publication of CN111472832A publication Critical patent/CN111472832A/en
Application granted granted Critical
Publication of CN111472832B publication Critical patent/CN111472832B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • 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
    • E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
    • E21B43/166—Injecting a gaseous medium; Injecting a gaseous medium and a liquid medium
    • E21B43/168—Injecting a gaseous medium

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Solid Fuels And Fuel-Associated Substances (AREA)

Abstract

The invention discloses a coal seam gas self-circulation gas injection yield-increasing method which is suitable for underground coal mine gas extraction.A gas injection drill hole and a gas extraction drill hole are constructed in a coal seam at first, then a gas extraction pipe and a gas injection pipe are respectively placed into the gas extraction drill hole and the gas injection drill hole and then sealed, and a coal seam gas self-circulation gas injection yield-increasing system is formed through the serial work of a gas extraction pump, a filtering device, a gas storage tank, a gas mixing chamber, a gas booster pump and a valve; the alternating reinforced gas extraction method is formed by combining the gas extraction systems connected in parallel, and is simple to operate, low in cost, high in safety, good in extraction effect and wide in application range.

Description

Coal bed gas self-circulation gas injection yield increasing method
Technical Field
The invention relates to the field of coal seam gas extraction, in particular to a coal seam gas self-circulation gas injection yield-increasing method.
Background
With the gradual exhaustion of shallow coal resources, the coal resource exploitation will gradually enter deep coal resources in the future. And the deep coal seam has the characteristics of high gas content, high pressure and the like, and seriously threatens the safe mining and generation of coal mines. Because coal bed gas is not only a clean energy source but also a strong greenhouse gas. According to statistics, the coal bed gas resource amount buried deep between 1000-2000 m in China accounts for 61.2% of the total coal bed gas resource amount in China, and the coal bed gas resource mining method has extremely high mining value. Therefore, the realization of the efficient exploitation of the coal bed gas has important significance for improving the coal mine safety exploitation, realizing the resource utilization and protecting the environment.
Most coal bed gas extraction modes in China at present mainly comprise: (1) directly connecting the coal ash into an extraction system for extraction through an extraction pump; (2) firstly, performing fracturing and permeability increasing on a coal seam through measures such as hydraulic fracturing, hydraulic slotting, loosening blasting and the like, and then pumping in a pumping system; (3) and injecting gases such as nitrogen, carbon dioxide and the like through a high-pressure pump to perform displacement extraction on the coal seam gas. However, the measures have the defects of high cost, low extraction efficiency, high construction risk and the like. Therefore, in order to improve the efficient extraction effect and the extraction concentration of the coal seam gas, a brand new extraction mode and method are urgently needed to meet the requirement of efficient extraction of the coal mine underground gas.
Disclosure of Invention
Aiming at the technical defects, the invention aims to provide a coal bed gas self-circulation gas injection yield increasing method which is simple to operate, low in cost, high in safety and good in extraction effect.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention provides a coal bed gas self-circulation gas injection production increasing method, which specifically comprises the following steps:
s1: firstly, respectively constructing two gas extraction drill holes and one gas injection drill hole from a roadway drill site to a coal seam, then respectively placing a gas extraction pipe I, a gas extraction pipe II and a gas injection pipe into the gas extraction drill holes and the gas injection drill holes, and then sealing the holes;
s2: connecting the first gas extraction pipe and the second gas extraction pipe with a gas suction port of a gas extraction pump through pipelines, and connecting a gas injection pipe with a gas outlet of a gas booster pump through a pipeline;
s3: the gas outlet of the gas extraction pump is divided into two paths, one path is connected with the gas extraction system, the other path is connected with the filtering device, a fourth valve and a first valve are respectively arranged on pipelines among the gas extraction system, the filtering device and the gas extraction pump, the gas outlet of the filtering device is sequentially connected with the gas storage tank, the gas mixing chamber and the gas booster pump through pipelines, and a second valve and a third valve are respectively arranged on pipelines among the gas storage tank, the gas booster pump and the gas mixing chamber;
s4: closing a valve IV, opening a gas extraction pump and a valve I, starting gas extraction of the coal seam, filtering waste residues and waste water generated in the extraction process of the extracted gas through a filtering device, then entering a gas storage tank, and then opening a valve II and controlling the opening degree of the valve II to enable the gas to enter a gas mixing chamber according to a certain flow;
s5: the method comprises the following steps of firstly detecting the concentration of gas flowing in a gas mixing chamber through the gas concentration detection function of the gas mixing chamber, and reducing the gas concentration to be outside an explosion limit range through injecting dry air for mixing if the gas concentration is within the gas explosion limit; then opening a valve III and a gas booster pump, and injecting the mixed gas into the coal bed through a gas injection pipe for displacement operation after the mixed gas is boosted to a set critical value through the gas booster pump;
s6: after the displacement is carried out for a certain time, closing the valve I, the valve II, the valve III and the gas booster pump;
s7: opening the valve IV, and connecting the gas extraction pipe I and the gas extraction pipe II into a gas extraction system through a gas extraction pump to perform extraction operation;
s8: and when the gas concentration in the gas extraction system is reduced to be below a set critical value, repeating the steps S4-S7 until the extraction operation is finished.
Preferably, in step S1, the gas injection borehole is located at a middle position between the two gas extraction boreholes.
Preferably, in step S8, the gas concentration critical value in the gas extraction system is set to 20%.
Preferably, in step S5, the critical value of the pressurization of the mixed gas by the gas booster pump is set to 10 Mpa.
Preferably, the displacement time is set to be hours in step S6.
The invention has the beneficial effects that: according to the self-displacement method for the coal bed gas, the self-displacement method for the coal bed gas is formed through the self-circulation system for the coal bed gas, so that a large amount of external gas is prevented from being mixed into the coal bed, the displacement cost is saved, and the displacement risk is reduced; meanwhile, the coal seam gas is circularly displaced by the extracted gas, so that the gas displacement effect is improved, and an alternating reinforced gas extraction method is formed by combining the gas extraction systems connected in parallel.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a diagram of a connection system of components in a coal bed gas self-circulation gas injection stimulation method according to an embodiment of the present invention.
Description of the drawings: 1-a drill site, 2-a gas injection pipe, 3-a gas extraction pipe I, 4-a gas extraction pipe II, 5-a coal bed, 6-a gas extraction pump, 7-a valve I, 8-a filtering device, 9-a gas storage tank, 10-a valve II, 11-a gas mixing chamber, 12-a valve III, 13-a gas booster pump, 14-a valve IV and 15-a gas extraction system.
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.
As shown in fig. 1, a coal bed gas self-circulation gas injection production increasing method specifically comprises the following steps:
s1: firstly, respectively constructing two gas extraction drill holes and a gas injection drill hole from a roadway drill site 1 to a coal seam 5, wherein the gas injection drill hole is positioned in the middle position between the two gas extraction drill holes, and then respectively placing a gas extraction pipe I3, a gas extraction pipe II 4 and a gas injection pipe 2 into the gas extraction drill hole and the gas injection drill hole, and then sealing the holes;
s2: connecting the first gas extraction pipe 3 and the second gas extraction pipe 4 with an air suction port of a gas extraction pump 6 through pipelines, and connecting the gas injection pipe 2 with a gas outlet of a gas booster pump 13 through a pipeline;
s3: the gas outlet of the gas extraction pump (6) is divided into two paths, one path is connected with the gas extraction system 15, the other path is connected with the filtering device 8, the pipelines among the gas extraction system 15, the filtering device 8 and the gas extraction pump 6 are respectively provided with a valve IV 14 and a valve I7, the gas outlet of the filtering device 8 is sequentially connected with the gas storage tank 9, the gas mixing chamber 11 and the gas booster pump 13 through pipelines, and the pipelines among the gas storage tank 9, the gas booster pump 13 and the gas mixing chamber 11 are respectively provided with a valve II 10 and a valve III 12;
s4: closing a fourth valve 14, opening a gas extraction pump 6 and a first valve 7, starting gas extraction of the coal seam 5, filtering waste residues and waste water generated in the extraction process by using an extracted gas through a filtering device 8, then entering a gas storage tank 9, and then opening a second valve 10 and controlling the opening degree of the second valve 10 to enable the gas to enter a gas mixing chamber 11 according to a certain flow rate;
s5: the concentration of the gas flowing in the gas mixing chamber 11 is detected through the gas concentration detection function of the gas mixing chamber, and if the concentration of the gas is within the gas explosion limit, the concentration of the gas is reduced to be outside the explosion limit range through injecting dry air for mixing; then opening a third valve 12 and a gas booster pump 13, boosting the mixed gas to 10Mpa by the gas booster pump 13, and injecting the gas into the coal seam 5 through a gas injection pipe 2 for displacement operation;
s6: after the displacement is carried out for 24 hours, closing the first valve 7, the second valve 10, the third valve 12 and the gas booster pump 13;
s7: opening a fourth valve 14, and connecting the first gas extraction pipe 3 and the second gas extraction pipe 4 into a gas extraction system 15 through a gas extraction pump 6 for extraction;
s8: and when the gas concentration in the gas extraction system 15 is reduced to be below 20%, repeating the steps S4-S7 until the extraction operation is finished.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (5)

1.一种煤层瓦斯自循环注气增产方法，其特征在于，具体包括以下步骤：1. a coalbed gas self-circulation gas injection method for increasing production, is characterized in that, specifically comprises the following steps: S1：首先从巷道钻场（1）向煤层（5）中分别施工两个瓦斯抽采钻孔和一个注气钻孔，然后再将瓦斯抽采管一（3）、瓦斯抽采管二（4）和注气管（2）分别放入瓦斯抽采钻孔和注气钻孔后并封孔；S1: First, construct two gas drainage holes and one gas injection hole respectively from the roadway drilling field (1) into the coal seam (5), and then install the first gas drainage pipe (3) and the second gas drainage pipe ( 4) Put the gas injection pipe (2) into the gas drainage hole and the gas injection hole respectively and seal the hole; S2：将瓦斯抽采管一（3）和瓦斯抽采管二（4）通过管路与瓦斯抽采泵（6）吸气口相连接，注气管（2）通过管路与气体增压泵（13）出气口相连接；S2: Connect the gas extraction pipe 1 (3) and the gas extraction pipe 2 (4) to the suction port of the gas extraction pump (6) through the pipeline, and the gas injection pipe (2) to the gas booster pump through the pipeline (13) The air outlet is connected; S3：瓦斯抽采泵（6）出气口分两路，一路连接瓦斯抽采系统（15），另一路连接过滤装置（8），瓦斯抽采系统（15）、过滤装置（8）与瓦斯抽采泵（6）之间的管路上分别设置阀门四（14）和阀门一（7），过滤装置（8）出气口通过管路依次连接储气罐（9）、气体混配室（11）和气体增压泵（13），储气罐（9）、气体增压泵（13）与气体混配室（11）之间的管路分别设置阀门二（10）和阀门三（12）；S3: The gas outlet of the gas extraction pump (6) is divided into two channels, one is connected to the gas extraction system (15), and the other is connected to the filter device (8), the gas extraction system (15), the filter device (8) and the gas extraction system (15). Valve four (14) and valve one (7) are respectively set on the pipeline between the extraction pump (6), and the air outlet of the filter device (8) is connected to the gas storage tank (9) and the gas mixing chamber (11) in turn through the pipeline The pipelines between the gas booster pump (13), the gas storage tank (9), the gas booster pump (13) and the gas mixing chamber (11) are respectively provided with valve two (10) and valve three (12); S4：关闭阀门四（14），打开瓦斯抽采泵（6）和阀门一（7），开始进行煤层（5）的瓦斯抽采，抽采的瓦斯先经过过滤装置（8）过滤掉抽采过程产生的废渣和废水，然后进入到储气罐（9），之后打开阀门二（10）并控制阀门二（10）的开度使瓦斯气体按照一定流量进入到气体混配室（11）内；S4: Close valve four (14), open gas extraction pump (6) and valve one (7), and start gas extraction in coal seam (5). The extracted gas is filtered out by the filter device (8) first. The waste residue and waste water generated in the process then enter the gas storage tank (9), then open the second valve (10) and control the opening of the second valve (10) so that the gas gas enters the gas mixing chamber (11) according to a certain flow rate ; S5：在气体混配室（11）内首先通过其自带的气体浓度检测功能检测流入的瓦斯浓度，若瓦斯浓度处于瓦斯爆炸界限内，则通过注入干空气混配将瓦斯浓度降低到爆炸界限范围外；然后打开阀门三（12）和气体增压泵（13），混配后的瓦斯气体通过气体增压泵（13）增压到设定的临界值后，通过注气管（2）注入到煤层（5）中进行驱替作业；S5: In the gas mixing chamber (11), the inflowing gas concentration is first detected by its own gas concentration detection function. If the gas concentration is within the gas explosion limit, the gas concentration is reduced to the explosion limit by injecting dry air and mixing. Then open the valve three (12) and the gas booster pump (13), the mixed gas is boosted by the gas booster pump (13) to the set critical value, and then injected through the gas injection pipe (2). Go to the coal seam (5) to carry out the displacement operation; S6：待驱替一定时间后，关闭阀门一（7）、阀门二（10）、阀门三（12）和气体增压泵（13）；S6: After a certain time of displacement, close valve one (7), valve two (10), valve three (12) and gas booster pump (13); S7：打开阀门四（14），将瓦斯抽采管一（3）和瓦斯抽采管二（4）通过瓦斯抽采泵（6）连入瓦斯抽采系统（15）进行抽采作业；S7: Open the fourth valve (14), and connect the first gas extraction pipe (3) and the second gas extraction pipe (4) to the gas extraction system (15) through the gas extraction pump (6) for extraction operation; S8：待瓦斯抽采系统（15）中的瓦斯浓度降低到设定临界值以下时，重复步骤S4～步骤S7，直至抽采作业结束。S8: When the gas concentration in the gas extraction system (15) falls below the set threshold, repeat steps S4 to S7 until the extraction operation ends. 2.如权利要求1所述的一种煤层瓦斯自循环注气增产方法，其特征在于，步骤S1中，注气钻孔位于两个瓦斯抽采钻孔之间的中部位置。2 . The method for increasing production by gas self-circulation gas injection in coal seam as claimed in claim 1 , wherein, in step S1 , the gas injection hole is located in the middle position between two gas drainage holes. 3 . 3.如权利要求1所述的一种煤层瓦斯自循环注气增产方法，其特征在于，步骤S8中，设定瓦斯抽采系统（15）中的瓦斯浓度临界值为20%。3 . The method for increasing production by gas self-circulation gas injection in coal seam according to claim 1 , wherein in step S8 , the critical value of gas concentration in the gas extraction system ( 15 ) is set to 20%. 4 . 4.如权利要求1所述的一种煤层瓦斯自循环注气增产方法，其特征在于，步骤S5中，设定混配后的瓦斯气体通过气体增压泵（13）增压的临界值为10Mpa。4 . The method for increasing production by self-circulating gas injection of coal seam gas according to claim 1 , wherein in step S5 , the critical value of the mixed gas gas being pressurized by the gas booster pump ( 13 ) is set as a critical value. 5 . 10Mpa. 5.如权利要求1所述的一种煤层瓦斯自循环注气增产方法，其特征在于，步骤S6中设定驱替时间为24小时。5 . The method of claim 1 , wherein the displacement time is set to 24 hours in step S6 . 6 .
CN202010273790.6A 2020-04-09 2020-04-09 Coal bed gas self-circulation gas injection yield increasing method Active CN111472832B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010273790.6A CN111472832B (en) 2020-04-09 2020-04-09 Coal bed gas self-circulation gas injection yield increasing method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010273790.6A CN111472832B (en) 2020-04-09 2020-04-09 Coal bed gas self-circulation gas injection yield increasing method

Publications (2)

Publication Number Publication Date
CN111472832A CN111472832A (en) 2020-07-31
CN111472832B true CN111472832B (en) 2021-01-15

Family

ID=71751605

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010273790.6A Active CN111472832B (en) 2020-04-09 2020-04-09 Coal bed gas self-circulation gas injection yield increasing method

Country Status (1)

Country Link
CN (1) CN111472832B (en)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112696177B (en) * 2020-12-30 2022-04-01 太原理工大学 Application method of coal seam gas pressure exchange device based on compressed air system
CN112761586B (en) * 2021-01-22 2022-04-12 中国矿业大学 Drilling methane self-circulation blasting fracturing enhanced extraction method
CN113217079B (en) * 2021-03-01 2023-07-14 柴兆喜 Pressure equalizing circulation mine gas extraction coal hole
CN112780334A (en) * 2021-03-18 2021-05-11 柴兆喜 Shaft for extracting pure gas
CN113565470A (en) * 2021-06-18 2021-10-29 煤炭科学技术研究院有限公司 Gas injection displacement pneumatic pressurization system and method for promoting coal seam gas extraction
CN113404471A (en) * 2021-07-06 2021-09-17 煤炭科学技术研究院有限公司 Gas injection displacement coal seam gas extraction promoting coal seam gas drilling arrangement method
CN114320259B (en) * 2021-12-28 2024-12-24 徐州工程学院 A system and method for improving gas extraction effect by linking ground drilling groups
CN114320257B (en) * 2021-12-30 2023-11-03 中国矿业大学 Closed-loop system and method for enhanced drainage of coal seams by injecting heat after gas combustion in underground coal mines
CN115467703B (en) * 2022-09-23 2024-07-30 湖南科技大学 Auxiliary directional long borehole gas extraction method and system

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5085274A (en) * 1991-02-11 1992-02-04 Amoco Corporation Recovery of methane from solid carbonaceous subterranean of formations
CN104234740A (en) * 2014-09-03 2014-12-24 太原理工大学 Low-medium pressure air displacement high-pressure coalbed gas system and method thereof
CN104481575A (en) * 2014-11-06 2015-04-01 中国矿业大学 Hot steam displacement gas method for improving gas extraction efficiency
CN105443081A (en) * 2016-01-08 2016-03-30 中国矿业大学(北京) Gas extraction equipment and method based on alternation thought
CN205677660U (en) * 2016-06-12 2016-11-09 河南理工大学 System that a kind of hypotonic coal seam supercritical carbon dioxide is anti-reflection
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
CN107420126A (en) * 2017-07-26 2017-12-01 柴兆喜 Pressure circulation mine gas extraction system
CN109026128A (en) * 2018-06-22 2018-12-18 中国矿业大学 Multistage combustion shock wave fracturing coal body and heat injection alternation strengthen gas pumping method
CN109356640A (en) * 2018-10-25 2019-02-19 四川大学 A system for enhanced gas drainage by alternating hot and cold coal breaking and permeability enhancement
CN109505565A (en) * 2018-12-18 2019-03-22 中国矿业大学 A method of water filling and gas injection alternation displacement draining coal seam gas
CN110792468A (en) * 2019-09-06 2020-02-14 西安科技大学 A coal mine underground circulating pulse gas injection displacement gas extraction system

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6244338B1 (en) * 1998-06-23 2001-06-12 The University Of Wyoming Research Corp., System for improving coalbed gas production
CA2933622A1 (en) * 2013-12-13 2015-06-18 Chevron U.S.A. Inc. System and methods for controlled fracturing in formations

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5085274A (en) * 1991-02-11 1992-02-04 Amoco Corporation Recovery of methane from solid carbonaceous subterranean of formations
CN104234740A (en) * 2014-09-03 2014-12-24 太原理工大学 Low-medium pressure air displacement high-pressure coalbed gas system and method thereof
CN104481575A (en) * 2014-11-06 2015-04-01 中国矿业大学 Hot steam displacement gas method for improving gas extraction efficiency
CN105443081A (en) * 2016-01-08 2016-03-30 中国矿业大学(北京) Gas extraction equipment and method based on alternation thought
CN205677660U (en) * 2016-06-12 2016-11-09 河南理工大学 System that a kind of hypotonic coal seam supercritical carbon dioxide is anti-reflection
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
CN107420126A (en) * 2017-07-26 2017-12-01 柴兆喜 Pressure circulation mine gas extraction system
CN109026128A (en) * 2018-06-22 2018-12-18 中国矿业大学 Multistage combustion shock wave fracturing coal body and heat injection alternation strengthen gas pumping method
CN109356640A (en) * 2018-10-25 2019-02-19 四川大学 A system for enhanced gas drainage by alternating hot and cold coal breaking and permeability enhancement
CN109505565A (en) * 2018-12-18 2019-03-22 中国矿业大学 A method of water filling and gas injection alternation displacement draining coal seam gas
CN110792468A (en) * 2019-09-06 2020-02-14 西安科技大学 A coal mine underground circulating pulse gas injection displacement gas extraction system

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
我国注气驱替煤层瓦斯技术应用现状与展望;郝定溢等;《中国矿业》;20160731;第25卷(第7期);第77-81页 *
混合气体驱替煤层气技术的可行性研究;方志明等;《岩土力学》;20101031;第31卷(第10期);第3223-3229页 *

Also Published As

Publication number Publication date
CN111472832A (en) 2020-07-31

Similar Documents

Publication Publication Date Title
CN111472832B (en) Coal bed gas self-circulation gas injection yield increasing method
AU2014336858A1 (en) Method for enhanced fuel gas extraction by coal mine underground gas-liquid dual-phase alternating phase-driven fracturing of coal body
CN105332684B (en) A kind of water under high pressure is quick-fried and CO2The coal bed gas displacement extraction technique that pressure break is combined
CN112761586B (en) Drilling methane self-circulation blasting fracturing enhanced extraction method
CN202064905U (en) Gas lift liquid drainage device of vehicle-mounted natural gas compressor
CN115539130B (en) Coal seam gas exploitation and CO (carbon monoxide) enhancement of non-shearable layer 2 Sealing method
CN105422164B (en) Hydrofracturing is anti-reflection to aid in coal seam efficient water injection method and apparatus
CN101915086B (en) Coal mine underground gas borehole fracturing method
CN109653787B (en) Coordinated extraction pressure relief method for high-pressure-bearing water and high-gas coal seam group
CN104989356A (en) Underground coal mine coal seam drilling high-pressure gas fracturing and permeability increasing method and system
CN116658140A (en) Method for extracting methane from coal seam by hot flue gas displacement blasting fracturing and closed-loop carbon fixation
CN203531877U (en) Underground coal mine fracturing connecting device
CN110485966A (en) A method of it solving coal dust and blocks coal seam fracture
CN114412419B (en) Efficient closed-loop extraction method for superposed coal bed gas reservoir
CN111075496B (en) Device and method for comprehensively eliminating outburst dust in coal seam by low-pressure injection of flue gas absorption liquid
CN110541697B (en) Expansion hose type hydraulic fracturing method for permeability increase of coal seam
CN115977603B (en) Gas-water mixed injection CO based on multistage fracturing2Hydrate sealing cover layer generation system and regulation and control method
CN114718535B (en) Method for reversely blocking coal-bed gas well by utilizing high-pressure gas
CN208040348U (en) Slip casting bag pocket type hole packer
CN105735958A (en) Method and system for increasing coal bed gas permeability based on water vapor injection
CN116906108A (en) A method for horizontal multi-directional closed-loop extraction of coal seam methane by hot flue gas displacing
CN115822535A (en) Method for calculating mineralization blocking stock under ultra-low permeability reservoir intermittent carbon dioxide injection system
CN105422067B (en) The method of active water displacement exploiting coal bed methane
CN207177857U (en) Pipe column
CN222376550U (en) System for displacement of coal seam gas by alternately injecting water and gas through sequential layer hole pulsation circulation

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