Application and development of numerical simulation for underground horizontal directional drilling

摘要

In coalmines of China,horizontal directional drilling (HDD) is an increasingly popular method for underground in-seam gas drainage.Numerical simulation,especially fmite element analysis,is often used as an effective method to improve HDD operation.These improvements focus on rock-breaking efficiency,directional precision,stability of the borehole wall,and reliability of the drill equipment.On the basis of underground drilling characteristics,typical numerical simulation examples in drilling techniques and equipment are summarized and analyzed.In the end,the future development trends of numerical simulation in underground in-seam drilling are proposed.