关键词: 井下煤矿, 定向钻进技术, 复合钻进技术, 复合定向钻进技术

Abstract: At present，sliding directional drilling technology of underground coal mine is already a mature drilling technology.With the continuous expansion of the technology applications，the problems of low drilling efficiency，poor drilling safety and not conducive to realize deep hole drilling are gradually exposed.The characteristics of sliding directional drilling technology and compound directional drilling technology (i.e：directional drilling method that combines sliding directional drilling technology with compound directional drilling technology) are introduced in this paper.The advantages of compound directional drilling technology are analyzed from the three aspects of safety，efficiency and deep hole drilling.Practice has proved that compound directional drilling technology can effectively improve drilling efficiency，prevent accidents and achieve deep hole drilling，and can be tested and promoted as a safe，effective new technology for deep hole directional drilling.Finally，for the lack of the view that the improvement of compound directional drilling rate is only due to the improvement of bit absolute speed，comprehensive research of the relationship between rotational speed，torque，crushed rock power and drilling efficiency should be conducted.

Key words: Underground coal mine, Directional drilling technology, Compound drilling technology, Compound directional drilling technology