WO2018161470A1 - Method sequentially employing acetone erosion and hydraulic fracturing techniques in borehole to increase permeability of coal seam - Google Patents
Method sequentially employing acetone erosion and hydraulic fracturing techniques in borehole to increase permeability of coal seam Download PDFInfo
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- WO2018161470A1 WO2018161470A1 PCT/CN2017/089969 CN2017089969W WO2018161470A1 WO 2018161470 A1 WO2018161470 A1 WO 2018161470A1 CN 2017089969 W CN2017089969 W CN 2017089969W WO 2018161470 A1 WO2018161470 A1 WO 2018161470A1
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- solvent
- coal seam
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- 239000003245 coal Substances 0.000 title claims abstract description 58
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 title claims abstract description 52
- 230000035699 permeability Effects 0.000 title abstract description 11
- 238000000034 method Methods 0.000 title abstract description 9
- 230000003628 erosive effect Effects 0.000 title abstract 4
- 239000002904 solvent Substances 0.000 claims abstract description 59
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 34
- 238000005086 pumping Methods 0.000 claims description 7
- 238000001028 reflection method Methods 0.000 claims description 7
- 238000007789 sealing Methods 0.000 claims description 7
- 239000007788 liquid Substances 0.000 claims description 6
- 239000002699 waste material Substances 0.000 claims description 6
- 238000010276 construction Methods 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims description 3
- 230000009545 invasion Effects 0.000 claims 1
- 239000011148 porous material Substances 0.000 abstract description 6
- 238000003795 desorption Methods 0.000 abstract description 5
- 230000015572 biosynthetic process Effects 0.000 abstract 1
- 230000005012 migration Effects 0.000 abstract 1
- 238000013508 migration Methods 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 7
- 238000005553 drilling Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000000605 extraction Methods 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 238000005065 mining Methods 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
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Classifications
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- 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
- E21B43/27—Methods for stimulating production by forming crevices or fractures by use of eroding chemicals, e.g. acids
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- 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
- E21B43/006—Production of coal-bed methane
Definitions
- the invention relates to an alternating coal seam anti-filtration method combined with drilling acetone attack and hydraulic fracturing, and belongs to the technical field of coal mine underground coal seam anti-penetration, and is particularly suitable for a soft high gas low permeability coal seam.
- the pore fracture structure of the coal seam can be improved, the permeability of the coal body can be improved, and the gas desorption flow can be promoted, and an efficient coal layer anti-reflection purpose can be achieved.
- the acetone solvent has obvious invasive effect on the coal body, and the acetone is easily soluble in water.
- the effect of removing acetone can be achieved at the same time, and the effect of one-water use can be achieved.
- the alternate coal seam anti-reflection method combined with the acetone attack and hydraulic fracturing can achieve the desired effect.
- the object of the present invention is to overcome the deficiencies in the prior art, and to provide an alternate coal seam anti-reflection method which combines drilling acetone attack and hydraulic fracturing which is simple in method and can greatly improve the effect of coal seam penetration enhancement. .
- An alternate coal seam anti-filtration method combining the acetone attack and hydraulic fracturing of the present invention comprises constructing a fracture hole in the coal seam and two drainage holes disposed on both sides of the fracture hole, It is characterized in that it further comprises the following steps:
- the solvent valve is opened, so that the acetone solvent in the solvent tank is injected into the coal seam through the solvent pump, the three-way and the solvent tube to perform the invasive operation;
- the exposed end of the solvent tube is located 0.1 to 0.15 m from the orifice.
- the exposed end of the drainage tube is located 0.1 to 0.15 m from the orifice.
- the present invention combines acetone attack with hydraulic fracturing, and can greatly improve the effect of coal seam enhancement.
- the coal body is attacked, new cracks are generated, and then the hydraulic fracturing is used to fracturing the media, promoting the growth and development of coal pores and fissures, increasing the permeability of coal, and desorbing the gas in the coal.
- the creation of good conditions, improved coal seam pore fissure structure, improved coal permeability, and promoted gas desorption flow thus creating favorable conditions for improving coal seam gas drainage efficiency, and has wide practicality in the technical field.
- FIG. 1 is a schematic view showing an alternate coal seam anti-reflection method in combination with a borehole attack and hydraulic fracturing of the present invention.
- the alternate coal seam anti-reflection method combining the drilling acetone attack and the hydraulic fracturing of the present invention has the following steps:
- a fracture hole 3 and two drainage holes 2 provided on both sides of the fracture hole 3 are constructed in the coal seam 1, and then the solvent pipe 4 is fed into the fracture hole 3 after completion of construction until the solvent pipe 4
- the front end of the solvent tube 4 reaches the top of the fracture hole 3; the exposed end of the solvent tube 4 is 0.1-0.15 m away from the orifice;
- the drainage hole 2 and the fracture hole 3 are sealed by the sealing device 14; the distance of the sealing end face outside the hole is 1-1.5 m from the orifice;
- the solvent valve 8 is opened, so that the acetone solvent in the solvent tank 7 is injected into the coal seam through the solvent pump 6, the three-way 5 and the solvent tube 4 to invade the operation, and the coal body is attacked by the action of acetone. , creating new cracks;
- the solvent valve 8 is closed, and the water pump valve 10 is opened, so that the water in the water tank 12 is hydraulically fractured by the high pressure water pump 11, the high pressure hose 9, the tee 5 and the solvent tube 4 to promote the coal body.
- the growth and development of pores and fissures increase the permeability of coal, and create favorable conditions for the gas desorption flow in the coal.
- the acetone solvent dissolves in water to form a dilute acetone solution, which is transported to the waste liquid treatment system through the suction pipe 13;
Abstract
Disclosed is a method sequentially employing acetone erosion and hydraulic fracturing techniques in a borehole to increase permeability of a coal seam. The method employs an acetone solvent to perform an erosion operation on a coal seam, and new cracks are formed at the coal seam eroded by acetone. Next, a hydraulic fracturing operation is performed on the coal seam to facilitate formation of pores and cracks at the coal seam, thereby increasing permeability of the coal seam, and facilitating desorption and flow of gas in the coal seam. The method combines acetone erosion and hydraulic fracturing techniques to improve pore and crack structures of a coal seam, increase permeability of the coal seam and facilitate desorption and migration of gas, thereby enabling gas to be extracted from a coal seam effectively.
Description
本发明涉及一种钻孔丙酮侵袭与水力压裂相结合的交替式煤层增透方法，属于煤矿井下煤层增透相关技术领域，尤其适用于松软高瓦斯低透气性煤层。The invention relates to an alternating coal seam anti-filtration method combined with drilling acetone attack and hydraulic fracturing, and belongs to the technical field of coal mine underground coal seam anti-penetration, and is particularly suitable for a soft high gas low permeability coal seam.
目前，我国的瓦斯抽采手段主要是钻孔抽采，对煤层透气性有着较高的要求，而且随着我国煤矿开采深度的不断加深，煤层透气性对瓦斯抽采的制约越来越严重，良好的煤层增透技术成为了煤矿深层开采的必备技术。为了解决这一难题，已有诸多学者对此进行了大量的研究，水力压裂是一种常用的煤层增透手段，但是现有的水力压裂技术效果不稳定，在地应力作用下，压裂裂隙会快速闭合，存在卸压不充分等现象。而利用有机溶剂对煤体进行侵袭，可使煤体受到侵袭，产生新的裂隙。如果先对煤体利用溶剂侵袭，再进行水力压裂作业，可改善煤层孔隙裂隙结构、提升煤体渗透率、促进瓦斯解吸流动，定能达到一种高效的煤层增透目的。经过实验研究，丙酮溶剂对煤体的侵袭作用明显，且丙酮易溶于水，在侵袭作业之后进行水力压裂作业的同时，可以同时达到清除丙酮的效果，达到一水两用的效果。这种钻孔丙酮侵袭与水力压裂相结合的交替式煤层增透方法定能取得理想的效果。At present, China's gas extraction methods are mainly borehole extraction, which has high requirements on coal seam permeability. With the deepening of coal mining depth in China, the coal seam permeability is more and more restrictive to gas drainage. Good coal seam anti-reflection technology has become an indispensable technology for deep mining in coal mines. In order to solve this problem, many scholars have done a lot of research on this. Hydraulic fracturing is a commonly used coal seam anti-reflection method, but the existing hydraulic fracturing technology is unstable. Under the action of ground stress, pressure The cracks will close quickly and there will be insufficient pressure relief. The use of organic solvents to invade the coal body can cause the coal body to be attacked and create new cracks. If the coal body is first invaded by solvent and then hydraulic fracturing operation, the pore fracture structure of the coal seam can be improved, the permeability of the coal body can be improved, and the gas desorption flow can be promoted, and an efficient coal layer anti-reflection purpose can be achieved. After experimental research, the acetone solvent has obvious invasive effect on the coal body, and the acetone is easily soluble in water. At the same time as the hydraulic fracturing operation after the invasive operation, the effect of removing acetone can be achieved at the same time, and the effect of one-water use can be achieved. The alternate coal seam anti-reflection method combined with the acetone attack and hydraulic fracturing can achieve the desired effect.
发明内容Summary of the invention
技术问题：本发明的目的是克服已有技术中存在的不足之处，提供一种方法简单、能够大幅提高煤层增透效果的钻孔丙酮侵袭与水力压裂相结合的交替式煤层增透方法。Technical Problem: The object of the present invention is to overcome the deficiencies in the prior art, and to provide an alternate coal seam anti-reflection method which combines drilling acetone attack and hydraulic fracturing which is simple in method and can greatly improve the effect of coal seam penetration enhancement. .
技术方案：本发明的一种钻孔丙酮侵袭与水力压裂相结合的交替式煤层增透方法，包括在煤层中施工一个压裂孔和设在压裂孔两侧的两个抽放孔，其特征在于，还包括以下步骤：Technical Solution: An alternate coal seam anti-filtration method combining the acetone attack and hydraulic fracturing of the present invention comprises constructing a fracture hole in the coal seam and two drainage holes disposed on both sides of the fracture hole, It is characterized in that it further comprises the following steps:
a、在施工完成后的压裂孔内送入溶剂管，直至溶剂管的前端到达压裂孔的顶部；a. Feed the solvent tube into the fracture hole after the completion of the construction until the front end of the solvent tube reaches the top of the fracture hole;
b、在溶剂管的外露端连接三通，三通的一端连接溶剂泵，溶剂泵连接溶剂箱，溶剂泵前端安装溶剂阀门；三通另一端连接高压胶管，高压胶管依次连接高压水泵和水箱，高压水泵前端安装水泵阀门,水泵阀门前端安装压力表；b. Connect the tee at the exposed end of the solvent tube. One end of the three-way is connected to the solvent pump, the solvent pump is connected to the solvent tank, and the solvent valve is installed at the front end of the solvent pump; the other end of the three-way is connected with the high-pressure hose, and the high-pressure hose is connected to the high-pressure water pump and the water tank in turn. The water pump valve is installed at the front end of the high pressure water pump
c、在压裂孔两侧的抽放孔内分别送入抽放管，直至抽放管的前端到达抽放孔顶部，将抽放管的外露端与废液处理系统相连接；c. Feeding the drainage pipe into the drainage holes on both sides of the fracture hole until the front end of the drainage pipe reaches the top of the drainage hole, and the exposed end of the drainage pipe is connected with the waste liquid processing system;
d、管路布置完成之后，用封孔器对抽放孔和压裂孔进行封孔；d. After the pipeline arrangement is completed, the drainage hole and the fracture hole are sealed by a sealing device;
e、封孔作业完成后，打开溶剂阀门，使溶剂箱中的丙酮溶剂经过溶剂泵、三通和溶剂管注入到煤层中进行侵袭作业；e. After the sealing operation is completed, the solvent valve is opened, so that the acetone solvent in the solvent tank is injected into the coal seam through the solvent pump, the three-way and the solvent tube to perform the invasive operation;
f、侵袭作业完成后，关闭溶剂阀门，打开水泵阀门，使水箱中的水经过高压水泵、高压
胶管、三通和溶剂管对煤层实施水力压裂，同时，丙酮溶剂溶于水后形成稀丙酮溶液，经抽放管输送至废液处理系统；f. After the invasive operation is completed, close the solvent valve and open the water pump valve so that the water in the water tank passes through the high pressure water pump and the high pressure.
The hose, the tee and the solvent tube perform hydraulic fracturing on the coal seam, and at the same time, the acetone solvent dissolves in water to form a dilute acetone solution, and is transported to the waste liquid treatment system through the suction pipe;
g、当压力表显示压力明显上升时，关闭水泵阀门，将抽放管与井下瓦斯管网连接，进行瓦斯抽采。g. When the pressure gauge shows a significant increase in pressure, close the pump valve and connect the pumping pipe to the underground gas pipe network for gas drainage.
所述溶剂管的外露端距离孔口0.1-0.15m位置处。The exposed end of the solvent tube is located 0.1 to 0.15 m from the orifice.
所述抽放管的外露端距离孔口0.1-0.15m位置处。The exposed end of the drainage tube is located 0.1 to 0.15 m from the orifice.
有益效果：由于采用了上述技术方案，本发明将丙酮侵袭与水力压裂相结合，能够大幅提高煤层增透效果。在丙酮作用下，煤体受到侵袭，产生新的裂隙，然后利用水力压裂对媒体进行压裂作业，促进煤体孔隙和裂隙的生长发育，提高煤体渗透率，为煤体中瓦斯解吸流动创造良好条件，改善了煤层孔隙裂隙结构、提升了煤体渗透率、促进了瓦斯解吸流动，从而为提高煤层瓦斯抽采效率创造良好条件，在本技术领域内具有广泛的实用性。Advantageous Effects: Due to the adoption of the above technical solution, the present invention combines acetone attack with hydraulic fracturing, and can greatly improve the effect of coal seam enhancement. Under the action of acetone, the coal body is attacked, new cracks are generated, and then the hydraulic fracturing is used to fracturing the media, promoting the growth and development of coal pores and fissures, increasing the permeability of coal, and desorbing the gas in the coal. The creation of good conditions, improved coal seam pore fissure structure, improved coal permeability, and promoted gas desorption flow, thus creating favorable conditions for improving coal seam gas drainage efficiency, and has wide practicality in the technical field.
图1是本发明的钻孔丙酮侵袭与水力压裂相结合的交替式煤层增透方法示意图。BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic view showing an alternate coal seam anti-reflection method in combination with a borehole attack and hydraulic fracturing of the present invention.
图中：1-煤层，2-抽放孔，3-压裂孔，4-溶剂管，5-三通，6-溶剂泵，7-溶剂箱，8-溶剂阀门，9-高压胶管，10-水泵阀门，11-高压水泵，12-水箱，13-抽放管，14-封孔器，15-压力表。In the picture: 1-coal, 2-drain, 3-fracture, 4-solvent, 5-three-way, 6-solvent pump, 7-solvent tank, 8-solvent valve, 9-high pressure hose, 10 -Water pump valve, 11-high pressure water pump, 12-water tank, 13-drain tube, 14-seal, 15-pressure gauge.
下面结合附图对本发明的一个实施例作进一步的描述：An embodiment of the present invention will be further described below with reference to the accompanying drawings:
本发明的钻孔丙酮侵袭与水力压裂相结合的交替式煤层增透方法，步骤如下：The alternate coal seam anti-reflection method combining the drilling acetone attack and the hydraulic fracturing of the present invention has the following steps:
a、首先在煤层1中施工一个压裂孔3和设在压裂孔3两侧的两个抽放孔2，然后在施工完成的压裂孔3内送入溶剂管4，直至溶剂管4的前端到达压裂孔3的顶部；所述溶剂管4的外露端距离孔口0.1-0.15m位置处；a. First, a fracture hole 3 and two drainage holes 2 provided on both sides of the fracture hole 3 are constructed in the coal seam 1, and then the solvent pipe 4 is fed into the fracture hole 3 after completion of construction until the solvent pipe 4 The front end of the solvent tube 4 reaches the top of the fracture hole 3; the exposed end of the solvent tube 4 is 0.1-0.15 m away from the orifice;
b、在溶剂管4的外露端连接三通5，三通的一端连接溶剂泵6，溶剂泵6连接溶剂箱7，溶剂泵6前端安装溶剂阀门8；三通5另一端连接高压胶管9，高压胶管9依次连接高压水泵11和水箱12，高压水泵11前端安装水泵阀门10,水泵阀门10前端安装压力表15；b. Connect the three-way 5 at the exposed end of the solvent tube 4, one end of the three-way is connected to the solvent pump 6, the solvent pump 6 is connected to the solvent tank 7, the solvent pump 6 is equipped with a solvent valve 8 at the front end, and the other end of the three-way 5 is connected with the high-pressure hose 9, The high pressure hose 9 is connected to the high pressure water pump 11 and the water tank 12 in sequence, the water pump valve 10 is installed at the front end of the high pressure water pump 11, and the pressure gauge 15 is installed at the front end of the water pump valve 10;
c、在压裂孔3两侧的抽放孔2内分别送入抽放管13，直至抽放管13的前端到达抽放孔2顶部，将抽放管13的外露端与废液处理系统相连接；所述抽放管13的外露端距离孔口0.1m位置处；c. Feeding the drainage pipe 13 into the drainage holes 2 on both sides of the fracture hole 3 until the front end of the drainage pipe 13 reaches the top of the drainage hole 2, and the exposed end of the drainage pipe 13 and the waste liquid treatment system Connected; the exposed end of the drainage tube 13 is 0.1m away from the orifice;
d、管路布置完成之后，用封孔器14对抽放孔2和压裂孔3进行封孔；孔外侧的封堵端面距孔口的距离为1-1.5m；d, after the pipeline arrangement is completed, the drainage hole 2 and the fracture hole 3 are sealed by the sealing device 14; the distance of the sealing end face outside the hole is 1-1.5 m from the orifice;
e、封孔作业完成后，打开溶剂阀门8，使溶剂箱7中的丙酮溶剂经过溶剂泵6、三通5和溶剂管4注入到煤层中进行侵袭作业，在丙酮作用下，煤体受到侵袭，产生新的裂隙；
e. After the sealing operation is completed, the solvent valve 8 is opened, so that the acetone solvent in the solvent tank 7 is injected into the coal seam through the solvent pump 6, the three-way 5 and the solvent tube 4 to invade the operation, and the coal body is attacked by the action of acetone. , creating new cracks;
f、侵袭作业完成后，关闭溶剂阀门8，打开水泵阀门10，使水箱12中的水经过高压水泵11、高压胶管9、三通5和溶剂管4对煤层1实施水力压裂，促进煤体孔隙和裂隙的生长发育，提高煤体渗透率，为煤体中瓦斯解吸流动创造良好条件，同时，丙酮溶剂溶于水后形成稀丙酮溶液，经抽放管13输送至废液处理系统；f. After the invasive operation is completed, the solvent valve 8 is closed, and the water pump valve 10 is opened, so that the water in the water tank 12 is hydraulically fractured by the high pressure water pump 11, the high pressure hose 9, the tee 5 and the solvent tube 4 to promote the coal body. The growth and development of pores and fissures increase the permeability of coal, and create favorable conditions for the gas desorption flow in the coal. At the same time, the acetone solvent dissolves in water to form a dilute acetone solution, which is transported to the waste liquid treatment system through the suction pipe 13;
g、当压力表15显示压力明显上升时，关闭水泵阀门10，将抽放管13与井下瓦斯管网连接，进行瓦斯抽采。
g. When the pressure gauge 15 indicates that the pressure is significantly increased, the water pump valve 10 is closed, and the drainage pipe 13 is connected to the underground gas pipe network for gas drainage.
Claims (3)
- 一种钻孔丙酮侵袭与水力压裂相结合的交替式煤层增透方法，包括在煤层(1)中施工一个压裂孔(3)和设在压裂孔(3)两侧的两个抽放孔(2)，其特征在于，还包括以下步骤：An alternate coal seam anti-filtration method combining a hole in acetone attack and hydraulic fracturing, comprising constructing a fracturing hole (3) in the coal seam (1) and two pumping on both sides of the fracturing hole (3) The hole (2) is characterized in that it further comprises the following steps:a、在施工完成后的压裂孔(3)内送入溶剂管(4)，直至溶剂管(4)的前端到达压裂孔(3)的顶部；a. Feed the solvent tube (4) into the fracturing hole (3) after the completion of the construction until the front end of the solvent tube (4) reaches the top of the fracturing hole (3);b、在溶剂管(4)的外露端连接三通(5)，三通的一端连接溶剂泵(6)，溶剂泵(6)连接溶剂箱(7)，溶剂泵(6)前端安装溶剂阀门(8)；三通(5)另一端连接高压胶管(9)，高压胶管(9)依次连接高压水泵(11)和水箱(12)，高压水泵(11)前端安装水泵阀门(10),水泵阀门(10)前端安装压力表(15)；b. Connect the tee (5) to the exposed end of the solvent tube (4). Connect one end of the three-way to the solvent pump (6), the solvent pump (6) to the solvent tank (7), and the solvent pump (6) to the solvent valve at the front end. (8); the other end of the three-way (5) is connected with a high-pressure hose (9), and the high-pressure hose (9) is connected to the high-pressure water pump (11) and the water tank (12) in turn, and the water pump valve (10) is installed at the front end of the high-pressure water pump (11). Install a pressure gauge (15) on the front end of the valve (10);c、在压裂孔(3)两侧的抽放孔(2)内分别送入抽放管(13)，直至抽放管(13)的前端到达抽放孔(2)顶部，将抽放管(13)的外露端与废液处理系统相连接；c. Feed the pumping pipe (13) into the pumping holes (2) on both sides of the fracturing hole (3) until the front end of the pumping pipe (13) reaches the top of the pumping hole (2), and it will be drained. The exposed end of the tube (13) is connected to the waste liquid processing system;d、管路布置完成之后，用封孔器(14)对抽放孔(2)和压裂孔(3)进行封孔；d. After the pipeline arrangement is completed, the drainage hole (2) and the fracture hole (3) are sealed by a sealing device (14);e、封孔作业完成后，打开溶剂阀门(8)，使溶剂箱(7)中的丙酮溶剂经过溶剂泵(6)、三通(5)和溶剂管(4)注入到煤层中进行侵袭作业；e. After the sealing operation is completed, open the solvent valve (8), so that the acetone solvent in the solvent tank (7) is injected into the coal seam through the solvent pump (6), the three-way (5) and the solvent tube (4) for the invasion operation. ;f、侵袭作业完成后，关闭溶剂阀门(8)，打开水泵阀门(10)，使水箱(12)中的水经过高压水泵(11)、高压胶管(9)、三通(5)和溶剂管(4)对煤层(1)实施水力压裂，同时，丙酮溶剂溶于水后形成稀丙酮溶液，经抽放管(13)输送至废液处理系统；f. After the invasive operation is completed, close the solvent valve (8) and open the water pump valve (10) so that the water in the water tank (12) passes through the high pressure water pump (11), the high pressure hose (9), the tee (5) and the solvent tube. (4) Perform hydraulic fracturing on the coal seam (1), and at the same time, the acetone solvent is dissolved in water to form a dilute acetone solution, which is transported to the waste liquid treatment system through the suction pipe (13);g、当压力表显示压力明显上升时，关闭水泵阀门(10)，将抽放管(13)与井下瓦斯管网连接，进行瓦斯抽采。g. When the pressure gauge shows a significant increase in pressure, close the pump valve (10) and connect the pumping pipe (13) to the underground gas pipe network for gas drainage.
- 根据权利要求1所述的一种钻孔丙酮侵袭与水力压裂相结合的交替式煤层增透方法，其特征在于：所述溶剂管(4)的外露端距离孔口0.1-0.15m位置处。An alternate coal seam anti-reflection method according to claim 1, characterized in that: the exposed end of the solvent tube (4) is 0.1-0.15 m from the orifice .
- 根据权利要求1所述的一种钻孔丙酮侵袭与水力压裂相结合的交替式煤层增透方法，其特征在于：所述抽放管(13)的外露端距离孔口0.1-0.15m位置处。 An alternate coal seam anti-reflection method according to claim 1, characterized in that the exposed end of the drainage pipe (13) is 0.1-0.15 m from the orifice. At the office.
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| CN108266222A (en) * | 2018-01-10 | 2018-07-10 | 中国矿业大学 | A kind of solvent extraction, moistening reversion, pulsation pressure break Trinity coal body anti-reflection method |
| CN108708694B (en) * | 2018-05-28 | 2021-02-02 | 四川省煤炭产业集团有限责任公司 | High-pressure gas-liquid microbubble permeability increasing method for low-permeability coal seam |
| CN111828082B (en) * | 2020-07-21 | 2021-09-07 | 中国矿业大学 | Coal bed permeability increasing method with cooperation of chemical extraction and liquid explosive |
| CN115492563A (en) * | 2022-09-27 | 2022-12-20 | 中煤科工集团重庆研究院有限公司 | Multi-drill-hole through type fracturing, punching, permeation increasing and pressure relieving device and method for soft coal seam |
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