摘要
PDC钻头在深硬地层钻进时所受的黏滑振动是制约其高效利用的技术瓶颈。为了降低深硬地层钻进过程中钻头所承受的黏滑振动,引入了高频自激式扭力旋冲器。通过对旋冲器工作原理的分析,利用有限元软件(ANSYS/LS-DYNA)建立了PDC钻头非线性动力学三维模型。模拟了在有、无旋冲器作用下PDC钻头的磨损状况、运动特性以及岩石的失效情况,并在现场进行了多口井的试验。试验结果表明:旋冲器产生的高频扭转冲击力能有效提高PDC钻头和岩石受力的均匀性,抑制钻头所受的黏滑振动和切削齿的损坏。使用旋冲器能提高钻头的破岩效率,缩短钻井周期,为扭转冲击技术在深硬地层提速提供了重要的技术参考。
The stick-slip vibration is a technical bottleneck restricting for PDC bit in efficient drilling deep hard formation. To reduce the stick-slip vibration ol drill bit during drilling deep hard formations, a torkbuster has been introduced. Based on the analysis on the working principle of the torkbuster,a nonlinear dynamic 3D model of PDC bit has been established using the finite element software （ANSYS/LS-DYNA）. The wear and the motion characteristics of the PDC bit as well as the failure of the rock have been simulated with/without the action of the torkbuster,and been tested onsite in several wells. The results showed that the high frequency torsional impact force generated by the torkbuster can effectively improve the uniformity of the force on the PDC bit and rock, eliminate the stick-slip vibration and the cutter damage. The use of torkbuster can improve the rock breaking efficiency and shorten the drilling cycle, which provides an important technical reference for the torsional impact technology appli-cation in deep hard formations.
出处
《石油机械》
2017年第7期21-25,共5页
China Petroleum Machinery
基金
中国石油渤海钻探工程公司项目"钻井新工艺新工具实验与应用"(2012ZD17Y)的部分成果
长江大学博士启动基金项目(801110010136)
