Carbon dioxide phase change coal seam fracturing device and utilization method

Abstract

The invention relates to a carbon dioxide phase change coal seam fracturing device and a utilization method. A barrel is in threaded connection with a valve. The carbon dioxide phase change coal seam fracturing device is characterized in that the two ends of the barrel are in threaded connection with connectors with explosion venting holes, the connectors are provided with cable passing holes, and cable grooves for containing a cable are formed in one sides of the barrel and the two connectors. Due to the fact that the cable is placed in the cable grooves, or one pole of the cable is placed in the barrel, and the barrel is placed on the other pole of the cable, or the whole cable is placed in the barrel, and meanwhile the utilization method is provided, when conveyed into a coal seam drilled hole, the carbon dioxide phase change coal seam fracturing device can be rotated or directly pushed into the drilled hole through a drilling machine, and the situation that the cable is broken during external connecting is avoided; no other special equipment is needed, the depth of the part conveyed in the drilled hole is not limited, and high work efficiency and reliability are achieved; and a screw structure is adopted and directly screwed in a coal body, drilling links are reduced, the screw structure is beneficial to powder discharge and meanwhile is closely embedded with the coal body, gas acting force is improved, the fly stop problem is thoroughly solved, and high reliability is achieved.

Description

technical field [0001] The invention relates to coal cracking, anti-permeability and outburst prevention technologies and devices, in particular to a carbon dioxide phase change coal seam cracker and a utilization method. Background technique [0002] At present, the domestic method of using carbon dioxide extractors to enhance the permeability of coal seams has been partially applied. This method improves the efficiency of coal seam gas drainage and is an innovative technology to solve the current problem of coal mine gas drainage. The previous underground industrial experiment data show that the use of carbon dioxide After the extractor performs fracturing and anti-permeability enhancement, the coal seam gas drainage flow rate increases by about 5 times at most, and the gas concentration of the extracted gas increases by about 15 times, which can effectively shorten the extraction time, make the coal gas release quickly, and reduce the occurrence of gas accidents Therefore...

AI Technical Summary

Problems solved by technology

[0003] At present, the common carbon dioxide extractors in China are all modified by using the carbon dioxide extractors of the British company Cardox. The single carbon dioxide extractors are connected in series through the connectors, and the cables are connected outside. Due to the connection line, only manual or tools can be used. Push the carbon dioxide extractor into the hole. Due to the fact that the downhole drilling is not a straight line, and there are cinders, collapsed holes, etc., the current carbon dioxide extractor cannot be installed in the fracturing hole for more than 50m, and cable disconnection accidents often occur , low efficiency and many faults

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