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METHOD OF REFORMING COAL-BED GAS WELL EMPLOYING CONTROLLABLE SHOCK WAVES IN COMBINATION WITH SURGE WATER INJECTION PRESSURIZATION
METHOD OF REFORMING COAL-BED GAS WELL EMPLOYING CONTROLLABLE SHOCK WAVES IN COMBINATION WITH SURGE WATER INJECTION PRESSURIZATION
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机译：与涌水注入压力相结合的重整煤层气并采用可控冲击波的方法
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摘要
Disclosed is a method of reforming a coal-bed gas well employing controllable shock waves in combination with surge water injection pressurization. The method comprises the following steps: 1) installing a wellhead four-way joint (1) and a cable blowout preventer (2), wherein a lower end of the wellhead four-way joint (1) is connected to a wellhead, an upper end thereof is connected to the cable blowout preventer (2), a first side opening thereof is connected to a high-pressure water injection pipeline, and a second side opening thereof is connected to a pressure gage (3); 2) passing a controllable shock wave generation apparatus through the cable blowout preventer (2) and lowering the same down into a well; 3) closing the cable blowout preventer (2), injecting water into a coal-bed gas well, and when the water injection pressure reaches the compressive strength of the coal bed, activating the controllable shock wave generating apparatus to perform a pressurization operation by means of shock waves in combination with surge water injection; 4) upon completion of the operation for all operation points, opening the wellhead four-way joint (1) and the wellhead cable blowout preventer (2), and pulling out the controllable shock wave generating apparatus; and 5) lowering a water pump, a water pipe and a water pumping rod down into the well, and performing drainage according to a drainage technology.
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