Application of ground well extraction technology in large dip and multiple coal group in Xinjiang mining area

In view of the surface strata movement and overburden failure characteristics of large dip and multiple coal group in Aiweiergou mining area of Xinjiang, the instability mechanism of ground well with large dip and multiple coal group is analyzed.The ground well position has been reasonably selected, the drilling process and well structure are optimized, and the applicability test is conducted.After the test working surface, the well structure is stable, and there is no abnormal deformation and damage of casing basically, and the gas extraction of ground well is continuously stable.It can provide technical support and demonstration function for high efficient gas extraction from ground well with large dip and multiple coal group in Xinjiang mining area.