Construction Technology of Supplementary Coal Coring in Deep Hole of Coalmine

Abstract:

Coal seam is often lost in coalmine coring drilling, and supplementary coal coring is necessary to satisfy the geological design requirement and related geological specification. In the exploration drilling construction of Zhangde coalmine in Henan, the technology of supplementary coal coring in the deep hole was probed and developed, inclined hole was made with eccentric wedge to finish supplementary coal coring in the borehole of more than 1000m.