Taiyuan University of Technology

Weichao Fan

Zhen Li

Chunwang Zhang

Haina Jiang

Wenpu Li

Peng Yang

Zhilong Fang

Xiaojun Yang

Jiapeng Zhao

A multi-level cross-district surface well pattern deployment method is provided. Firstly, a horizontal well is drilled from a location on a land surface corresponding to a junction Hof a district rise coal pillar of the first district Cin a first level and an upper mine field boundary coal pillar. A multilateral well is drilled from a location on the land surface corresponding to a junction Hof a level coal pillar between the first and second levels, and the district rise coal pillar of the first district Cin the first level. Liquid nitrogen is injected for permeability improvement after a gas drainage quantity decreases to 20% of an initial quantity. Gas drainage is repeated multiple times until the drainage quantity of coal bed methane through a gas drainage pipe of the horizontal pipe is reached 3 m/min.

Multi-level cross mining areas surface well pattern deployment method

Growing community of inventors

Shanxi, China

Weichao Fan