Huainan Mining (Group) Co., Ltd.
China Coal Technology and Engineering Group Xi’an Research Institute (Group) Co., Ltd.
China Coal Research Institute

针对煤矿井下钻孔时钻头穿层钻进过程中遇到坚硬岩层而发生黏滑振动的问题，借助离散元数值模拟技术开展了PDC齿在5种典型硬度地层中切削破岩性能及黏滑振动特性研究。结果表明：钻头黏滑现象随着地层硬度的增加愈发明显，PDC齿切削极硬岩层时在岩石表面滑移而无法有效钻进；提高钻头转速在一定程度上能够减弱黏滑振动，但对提高钻进性能无明显增益效果；增加钻压能够显著提高钻头钻进效率，但同时会导致更严重的黏滑振动；采用扭转冲击方法能够有效减弱甚至抑制钻头的黏滑振动且能够提高钻头的钻进性能，但过大的扭转冲击会导致钻头所受冲击载荷增加。

For the problem of stick-slip vibration caused by hard rock formation in the process of drill bit penetrating in coal mine, and the discrete element method (DEM) was employed to study the rock cutting performance and stick-slip vibration behavior of PDC bit drilling in five typical different hardness rock strata. The result shows that the stick-slip phenomenon of the bit is more obvious with the increasing of the formation hardness, and in the ultra-hard rock layer, it slips on the rock surface and cannot be effectively drilled. The approach of increasing the rotational speed of the bit can weaken the stick-slip behavior to an extent, but it has no obvious effect on improving the drilling efficiency. The drilling performance of the bit can be improved by increasing drilling pressure, but it will also lead to more serious stick-slip vibration. The torsional impact method can effectively weaken or even inhibit the stick-slip vibration of the bit and improve the drilling performance. However, excessive torsional impact force will lead to an increase in the impact load on the bit.

淮南矿业（集团）有限责任公司科研资助项目（202201007）；中煤科工西安研究院（集团）有限公司科技创新基金资助项目（100000000829）

陈建，王力，汪勇，等. 基于离散元法的PDC钻头切削复合地层黏滑振动特性研究[J]. 煤矿安全，2023，54（11）：210−217.

CHEN Jian, WANG Li, WANG Yong, et al. Stick-slip vibration characteristic of PDC bit cutting composite strata based on discrete element method[J]. Safety in Coal Mines, 2023, 54（11）: 210−217.