高频扭转冲击钻井PDC钻头切削齿瞬间碰撞破岩分析

Analysis of instantaneous impact rock breaking of PDC cutting tooth for high frequency torsional percussion drilling

杨先伦 何世明 王涛1

陕西延长石油（集团）有限责任公司研究院，陕西 西安 710075 西南石油大学石油与天然气工程学院，四川 成都 610500

Research Institute of Shaanxi Yanchang Petroleum(Group) CO., Ltd., Xi′an 710075, China School of Oil and Natural Gas Engineering, Southwest Petroleum University, Chengdu 610500, China

高频扭转冲击钻井技术在深部硬地层中的运用效果显著，提高了地层机械钻速，改善了PDC钻头的受力状态。文中通过建立高频扭转冲击PDC切削齿瞬间碰撞破岩模型，运用工程软件，进行了切削齿破岩瞬间碰撞动态模拟研究，得出了冲击频率对切削齿受力环境和破岩效果的影响规律。结果表明：高频扭转冲击钻井存在最优冲击频率，能有效改善切削齿受力环境，减轻切削齿交变应力，即切向力峰值降低，均值增加；切削齿垂向位移、岩石破碎体积和破碎比功在最优冲击频率时能有效提高破岩效率，提高机械钻速。研究结果可为高频扭转冲击钻井设计的参数优化提供依据。

The application of high frequency torsional impact drilling technology in deep hard formations is remarkable, which increases the rate of penetration (ROP) and improves the stress state of PDC bit. The paper establishes an instantaneous impact rock-breaking model of PDC cutting tooth for high frequency torsional percussion, carries out the dynamic simulation of the instantaneous impact rock-breaking for cutting tooth by engineering software, obtains influence rule of impact frequency on the mechanical environment of cutting tooth and the rock-breaking effect. The results show that the optimal impact frequency can reduce the alternating stress of cutting tooth, and the peak value of tangential force decreases and the mean value increases; the vertical displacement of cutting tooth, rock breaking volume and specific energy of crushing under optimal impact frequency can effectively break rocks and improve the ROP. The research result can provide the basis for drilling design parameter optimization of high frequency torsional impact drilling.

10.6056/dkyqt201806021