The invention relates to the technical field of coalbed gas development and provides a method for coalbed gas draining and colleting of water and gas producing of an oil
pipe in order to solve the problems of air leakage and frequent
workover in an existing coalbed gas pumping and draining technology. The method comprises the following steps that when draining and collecting are conducted on a coalbed gas well, an annular space between an oil
pipe and a sleeve
pipe is closed, gas and water are discharged through the oil pipe, gas-water mixture discharged from the downhole oil pipe is separated through a gas-water separator arranged on the ground, and the separated
coal-
bed gas passes through a manifold and enters a gas collecting
station, and the separated water is discharged to a water draining
pool through the manifold. According to the method, by installing the gas-water separator on the ground, the gas and water are completely separated on the ground, the difficult problem of escaping of the gas of an water outlet through a conventional draining and collecting mode is solved, resource waste and environmental
pollution are avoided, meanwhile, an oil
pipe water and gas producing technology is used to be matched with a chemical detergent, a zone near a well and the periphery of a pump body can be flushed, and pulverized
coal is discharged back to the ground by using high speed fluid in the oil pipe.