Key Technology of Directional Drilling for Water Prevention and Control of Bottom plate Limestone in Zhangji Coal Mine

Abstract

The coal of group A in Zhangji Coal Mine is seriously threatened by limestone water damage. we use the directional drilling equipment to construct along the strata long drilling and explore the limestone aquifer of the working face bottom plate. According to the characteristics of the formation, the directional drilling casing hole section, rotary drilling hole section, directional bevel hole section, and directional stability The construction methods and key technology of the inclined hole section are analyzed and researched, and the 1414A working face is selected for directional exploration drilling for practical verification. The results show that the directional long drilling technology realizes the full coverage exploration of the working face bottom plate. The target layer has a high drilling encounter rate. The one-time exploration distance is long, which effectively solves the safety risk caused by the bottom plate limestone water damage to the working face safety production. Realizing the promotion of directional drilling equipment in the field of water prevention and control in Huainan Coalfield.