A new leakage sealing device for underground coal gasification mining process
A technology of mining process and plugging device, which is applied in earthwork drilling, sealing/isolation, wellbore/well components, etc. It can solve problems such as delay in construction period and economic loss, and prevent the loss of drilling fluid and the leakage of coalbed methane , design reasonable effect
Active Publication Date: 2021-06-25
CHINA UNIV OF MINING & TECH
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Problems solved by technology
The conventional method of cementing to seal well wall cracks is carried out under the condition of shutdown and production, which will not only delay the construction period, but also seriously cause huge economic losses
Method used
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[0028] In order to enhance the understanding of the present invention, the present invention will be described in detail below in conjunction with the embodiments and accompanying drawings. The embodiments are only used to explain the present invention and do not limit the protection scope of the present invention.
[0029] Such as Figure 1-11 As shown, the present invention is a novel underground coal gasification mining process leakage plugging device, including a drill string and a drill bit assembly 3 extending into the well of formation 1, a plugging system 7 passing through the drill string, and a gas pipeline 6 passing through a strand The disk 5 is fixedly connected with the air pump 4 and the vent hole 7031 of the sealing system 7 respectively, and the air pump 4 inflates several sealing air bags 701 on the sealing system 7 connected through the air pipe 720, so that the sealing air bags 701 expand and contact the inner wall of the well , the sealing airbag 701 is fi...
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The invention discloses a novel underground coal gasification mining process leak plugging device, which includes a drill string and a drill bit assembly extending into the formation well, the plugging system passes through the drill string, and the gas transmission pipeline is respectively connected to the gas pump and the sealing device through a twisted coil. The air hole of the plugging system is fixedly connected, and the air pump inflates several sealing airbags connected by the trachea on the sealing system, so that the sealing airbags expand and contact the inner wall of the well, and the sealing airbags are fixed on the connecting ring or the bottom connecting ring. A sealing shell is arranged between the two connecting rings or between the connecting ring and the bottom connecting ring, and a mileage wheel is arranged at the lower end of the bottom connecting ring to locate the descending depth of the blocking system. The invention has simple structure and reasonable design, can quickly seal the leak without affecting the mining operation, and prevent the loss of drilling fluid and the leakage of coal bed gas.
Description
technical field [0001] The invention relates to the technical field of underground coal gasification mining, in particular to a novel leakage sealing device for underground coal gasification mining. Background technique [0002] Underground coal gasification is to burn and gasify the underground coal in the coal seam into coal gas, and transport it to the ground as energy or chemical raw materials. Second recovery. The main products of underground coal gasification are carbon monoxide, hydrogen, carbon dioxide, hydrogen sulfide, methane, and organic sulfur. If there are cracks in the well wall during the mining process, coalbed methane will enter the formation through the cracks, and harmful gases such as hydrogen sulfide and carbon monoxide will cause serious pollution to the formation after entering the formation, so it must be blocked. The conventional method of injecting cement to seal the cracks in the shaft wall is carried out under the condition of shutdown and prod...
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IPC IPC(8): E21B33/12
CPCE21B33/1208
Inventor 吴财芳杜明洋周贺张莎莎周丹高彬胡新宇
Owner CHINA UNIV OF MINING & TECH