Novel leakage plugging device for underground coal gasification mining process

Abstract

The invention discloses a novel leakage plugging device for the underground coal gasification mining process. The novel leakage plugging device comprises a drill column and a drill bit assembly whichextend into a stratum well, a plugging system penetrates through the drill column, and a gas conveying pipeline is fixedly connected with a gas pump and a vent hole of the plugging system through a stranded wire disc; the gas pump inflates a plurality of sealing gas bags connected through gas pipes on the plugging system, so that the sealing gas bags expand and make contact with the inner wall ofthe well, the sealing gas bags are fixed to connecting rings or bottom end connecting rings, and each sealing shell is arranged between every two corresponding connecting rings or between the corresponding connecting ring and the corresponding bottom end connecting ring; and odometer wheels for positioning the descending depth of the plugging system are arranged at the lower ends of the bottom endconnecting rings. The novel leakage plugging device is simple in structure and reasonable in design, the leakage position can be quickly plugged under the condition that mining operation is not affected, and drilling fluid loss and coal bed gas leakage are prevented.

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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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

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