Method for coalbed gas draining and colleting of water and gas producing of oil pipe

Abstract

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.

Description

technical field [0001] The invention relates to the technical field of coal-bed methane development, in particular to a coal-bed methane extraction method in which oil pipes produce water and gas. Background technique [0002] Coalbed methane drainage is to use mechanical lifting equipment to lift the water in the wellbore to the ground, and gradually reduce the bottom flow pressure. As the bottom hole flow pressure decreases, a pressure drop funnel gradually forms and gradually expands outward, thereby gradually reducing the reservoir pressure of the coal seam, forcing the coalbed gas adsorbed on the inner surface of the coal matrix pores to be desorbed, and then seepage through the non-Darcy matrix pores and spread to natural fractures, and then the coalbed methane seeps from the fractures into the wellbore and is extracted. [0003] Shanxi Jincheng Anthracite Mining Group Co., Ltd. State Key Laboratory of Coal and Coalbed Methane Co-mining Analysis The current domestic c...

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problems of gas leakage at the water outlet and frequent workover in the existing coalbed methane pumping technology, the present invention further provides a coalbed methane drainage method for producing water and gas through oil pipes

Images