Method for removing water in a curve-shaped gas extraction directional long borehole

Abstract

This invention belongs to the field of coal seam gas drainage technology in underground coal mines, and relates to a method for removing water accumulated in curved directional long boreholes for gas drainage. Based on the source of water accumulation in curved directional long boreholes for gas drainage, this invention divides the accumulated water into two main categories and provides corresponding drainage methods according to the type of water. It solves the problem of water accumulation in curved directional long boreholes for gas drainage by adding branch holes. Furthermore, in the removal of the second type of water, it avoids the impact of negative pressure on gas extraction in curved directional long boreholes for gas drainage. Simultaneously, it solves the problem of the influence of borehole water accumulation on gas extraction in curved directional long boreholes for gas drainage, improves gas extraction efficiency, and prevents borehole accidents such as blowouts caused by water accumulation at low points in curved directional long boreholes for gas drainage.

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