A method for controlling the working cycle of a drainage pump of a coalbed methane well

Abstract

The invention discloses a method for controlling a working period of a drainage pump of a coal-bed methane well, and belongs to the field of coal-bed methane well development engineering. The method comprises the following steps that 1, the volume of a water seepage space of the coal-bed methane well is calculated according to the inner diameter of a production casing of the coal-bed methane well, the outer diameter of an oil pumping pipe and the distance between the bottom end of a coal bed and the plane where a suction port of the drainage pump is located, and the water seepage space is an annular space defined by the bottom end of the coal bed, the plane where the suction port of the drainage pump is located, the inner peripheral wall of the production sleeve and the outer peripheral wall of the oil pumping pipe; 2, the shutdown time of the drainage pump is calculated according to the volume of the water seepage space and the water seepage amount per hour of the coal-bed methane well; 3, the working time of the drainage pump is calculated according to the volume of the water seepage space, the theoretical water drainage amount per hour of the drainage pump and the actual water drainage efficiency of the drainage pump; and 4, the working period of the drainage pump is controlled according to the shutdown time of the drainage pump and the working time of the drainage pump. According to the method, the energy consumption of the drainage pump is reduced.

Description

technical field [0001] The invention belongs to the field of coal bed gas well development engineering, in particular to a method for controlling the working cycle of a drainage pump of a coal bed gas well. Background technique [0002] Coalbed methane wells are surface wells used to extract coalbed methane. During the mining process, a large amount of groundwater often seeps out of the coal seam. In order to prevent the seeping groundwater from affecting the exploitation of coalbed methane, a lifting system is usually used to drive the underground drainage pump to drain the groundwater. However, after the coalbed methane well is desorbed to produce gas, the groundwater seeping from the coal seam will gradually decrease, so that the groundwater will be drained quickly. , will undoubtedly cause the lifting system to do a lot of useless work, resulting in a waste of resources, so now there is a need for a method that can periodically control the work of the drainage pump, so ...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem that the drainage pump does useless work, the embodiment of the present invention provides a method for controlling the working cycle of the drainage pump of the coalbed methane well

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