单齿高频扭转冲击切削的破岩及提速机理

发布时间：2018-01-10 00:19

本文关键词：单齿高频扭转冲击切削的破岩及提速机理　出处：《石油学报》2017年05期 　论文类型：期刊论文

【摘要】：高频扭转冲击钻井作为一种新兴钻井技术,由于其在硬地层钻进中具有显著的提速效果以及能够较好抑制黏滑振动的发生而得到极大关注。但由于对其破岩机理以及提速机理认识不够清楚,使得高频扭转冲击钻井技术在推广应用时尚未发挥其最佳性能。基于有限元法建立了单齿扭转冲击切削岩石的拟三维数值仿真模型,研究了扭转冲击作用下钻齿切削岩石过程中的裂纹扩展、岩屑形成、损伤演化以及破岩比功等问题。研究结果表明:扭转冲击切削作用下岩石相比常规切削更易发生脆性破碎(体积破碎)形成大块岩屑;扭转冲击切削作用下的破岩比功要明显小于常规切削,且岩石单元从损伤萌生到刚度完全退化的时间同样要小于常规切削作用;在软地层中扭转冲击切削几乎没有提速效果。研究结果可为扭转冲击器及钻头设计、钻井参数优选提供依据。
[Abstract]:High frequency torsional impact drilling is a new drilling technology. Due to its remarkable speed raising effect in hard formation drilling and its ability to restrain the occurrence of viscous slip vibration, great attention has been paid to it, but it is not clear about the mechanism of rock breaking and increasing speed. The high frequency torsional impact drilling technology has not played its best performance when it is popularized and applied. Based on the finite element method, the pseudo-three-dimensional numerical simulation model of single tooth torsional impact cutting rock is established. The crack propagation and cuttings formation in the process of cutting rock by drilling teeth under torsional impact are studied. The results show that the brittle breakage (volume breakage) of rock is more likely to occur in torsional impact cutting than that in conventional cutting. The specific work of rock breaking under torsional impact cutting is obviously smaller than that of conventional cutting, and the time from damage initiation to complete stiffness degradation of rock element is also smaller than that of conventional cutting. The research results can provide basis for the design of torsional percussors and bit and the optimum selection of drilling parameters.
【作者单位】：西南石油大学机电工程学院;
【基金】：国家自然科学基金项目(No.51674214) 四川省科技计划国际合作计划项目(2016HH0008) 四川省青年科技创新研究团队项目(2017TD0014)资助
【分类号】：TE21
【正文快照】： 引用:祝效华,刘伟吉.单齿高频扭转冲击切削的破岩及提速机理[J].石油学报,2017,38(5):578-586.Cite:ZHU Xiaohua,LIU Weiji.The rock breaking and ROP rising mechanism for single-tooth high-frequency torsional impact cut-ting[J].Acta Petrolei Sinica,2017,38(5):578-

【相似文献】