EXPLOITATION METHOD AND EXPLOITATION WELL PATTERN FOR COALBED METHANE IN LOW-PERMEABILITY COALBED

摘要

The present disclosure discloses an exploitation method and an exploitation well pattern for coalbed methane in a low-permeability coalbed. The method comprises: determining a maximum principal stress direction in a low-permeability coalbed (1); disposing at least two large-roadway horizontal wells (3) in the low-permeability coalbed (1); disposing a plurality of production wells (4) on two sides of a horizontal segment (31) of each of the at least two large-roadway horizontal wells (3), wherein a diameter of each of the production wells (4) is smaller than a diameter of the horizontal segment (31) of the large-roadway horizontal well (3); exploiting the coalbed methane in the low-permeability coalbed through the at least two large-roadway horizontal wells (3) and the plurality of production wells (4). Through the horizontal segments (31) of the large-roadway horizontal wells (3) perpendicular to the maximum principal stress direction, the present disclosure promotes the stress release in low-permeability coalbed forms more fracture channels, thereby achieving the exploitation of the coalbed methane through the at least two large-roadway horizontal wells and the plurality of production wells, and improving the exploitation efficiency of the coalbed methane in the low-permeability coalbed.