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Microwave and ultrasonic synergistic enhanced coalbed methane recovery method

An ultrasonic and coalbed methane technology, applied in mining fluids, mining equipment, earthwork drilling and mining, etc., can solve problems such as water lock effect, achieve the effects of improving safety, increasing gas pressure, and wide practicability

Active Publication Date: 2017-03-15
CHINA UNIV OF MINING & TECH
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Problems solved by technology

Hydraulic measures are an effective method for gas control. However, the intrusion of external water can easily cause the water lock effect, which is an adverse factor that inhibits gas drainage. How to quickly and effectively remove the water lock effect has become an important issue for realizing the improvement of gas drainage in coal mines. Therefore, it is urgent to develop a new coalbed methane enhanced mining method that combines microwave and ultrasonic to solve the bottleneck of the application of this technology

Method used

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  • Microwave and ultrasonic synergistic enhanced coalbed methane recovery method

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Embodiment Construction

[0018] An embodiment of the present invention will be further described below in conjunction with accompanying drawing:

[0019] The coalbed methane enhanced mining method with microwave and ultrasonic waves of the present invention: first, construct a surface well 2 in the coal seam 1, and send casing pipe 3 and extraction pipe 4 into the surface well 2 after construction is completed, so that the casing pipe 3 and the front end of the extraction pipe 4 reach the middle of the coal seam 1; then connect the microwave antenna 5 to the front end of the coaxial waveguide 6, and then send it into the casing 3 from outside to inside until the microwave antenna 5 reaches the inner end of the casing 3; then The exposed end of the coaxial waveguide 6 is connected to the waveguide converter 7, and the waveguide converter 7 is connected to the rectangular waveguide 8 and the microwave generator 9 in turn, the operating frequency of the microwave generator 9 is 2.45GHz, and the power is 2...

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Abstract

The invention discloses a microwave and ultrasonic synergistic enhanced coalbed methane recovery method. The microwave and ultrasonic synergistic enhanced coalbed methane recovery method is especially suitable for a spongy high gas coalbed. The microwave and ultrasonic synergistic enhanced coalbed methane recovery method comprises the following steps: feeding a microwave antenna and an ultrasonic transducer into a ground well; enabling the microwave antenna and the ultrasonic transducer to be respectively connected with a microwave generator and an ultrasonic generator; turning on the microwave generator and the ultrasonic generator, and disturbing a coal body by elastic waves; meanwhile, using microwave heating to promote desorption of coalbed methane and hastening pores and fissures in the coalbed; migrating the coalbed methane to the ground well under the microwave and ultrasonic synergic action; finally, recovering the coalbed methane. The microwave and ultrasonic synergistic enhanced coalbed methane recovery method disclosed by the invention has important significance for improving the recovery of the coalbed methane and improving the safety of coal mining.

Description

technical field [0001] The invention relates to a method for intensified mining of coalbed methane in cooperation with microwaves and ultrasonic waves, which belongs to the related technical field of underground gas desorption in coal mines, and is especially suitable for soft and high-gassy coal seams. Background technique [0002] Most of the coal seams in my country are high gas pressure, high geostress and low permeability coal seams. During the coal seam mining process, the gas dynamic phenomenon is serious. At the same time, the coal seam has poor air permeability, which makes the extraction of most coal seams difficult and seriously affects the utilization rate of gas extraction coal. How to improve the permeability of coal body and promote the desorption and exploitation of coalbed methane are the key theoretical and technical issues in mine gas control and coalbed methane exploitation. With the in-depth development of research work on coal seam gas control, many sch...

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Application Information

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IPC IPC(8): E21B43/00E21B43/24E21B43/26E21F7/00
CPCE21B43/00E21B43/003E21B43/006E21B43/24E21B43/26E21F7/00
Inventor 李贺林柏泉王一涵路洁心王正洪溢都
Owner CHINA UNIV OF MINING & TECH
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