摘要
现有复合冲击破岩效率的研究均未考虑轴向冲击和扭转冲击载荷相位差对于破岩效率的影响,为此,进行了复合冲击载荷相位差对破岩效率影响的研究。建立了轴-扭复合冲击钻具PDC钻头单齿破岩数值模型,分析了轴向和扭转冲击应力波不同相位差对钻齿侵彻深度、切削面下岩石损伤以及钻后形成岩屑形态及数量的影响规律。研究结果表明:在轴向和扭转冲击载荷等振幅条件下,当相位差为50%时,侵彻深度最佳,切削面以下岩石损伤的程度更为明显;当轴向振幅较大,相位差为75%时,对于岩体侵彻深度效果的提升最为明显,破岩效果最佳;相位差为100%时,侵彻深度较深,且钻齿波动较小,产生的岩屑颗粒较小。研究结论可为复合冲击钻具结构的优化和运动参数的调整提供理论基础。
Previous researches on rock-breaking efficiency under compound impact neglect the effects of the phase difference between axial and torsional impact loads.Therefor,such effects were discussed.The single-cutter rock-breaking numerical model of PDC bit with axial-torsional compound impact drilling tool was established.The influences of different phase differences of stress waves under axial-torsional impact on cutter penetration depth,rock damage below the cutting surface and morphology and quantity of cuttings formed after drilling were analyzed.The results show that with the same amplitudes of axial and torsional impact loads,when the phase difference is 50%,the penetration depth is optimal,and the damage of rock below the cutting surface is considerably higher.When the axial amplitude is large,the phase difference of 75%presents the highest improvement of the penetration depth,and the phase difference of 100%is found with relatively higher penetration depth,smaller cutter fluctuation and smaller cutting particles.The findings of this research provide a theoretical basis for the structure optimization and the motion parameter adjustment of the compound impact drilling tool.
作者
席岩
王皓宇
齐悦
田玉栋
李军
汪伟
Xi Yan;Wang Haoyu;Qi Yue;Tian Yudong;Li Jun;Wang Wei(Faculty of Architecture,Civil And Transportation Engineering,Beijing University of Technology;Drilling Engineering Technology Research Institute of Daqing Drilling Engineering Company;China University of Petroleum(Beijing))
出处
《石油机械》
北大核心
2023年第3期40-48,共9页
China Petroleum Machinery
基金
国家自然科学基金青年基金项目“基于压裂过程中四维地质力学的套管变形机理及控制方法研究”(52004013)。
关键词
冲击钻井工具
复合冲击
破岩效率
相位差
数值模型
侵彻深度
impact drilling tool
compound impact
rock-breaking efficiency
phase difference
numerical model
penetration depth
