高频扭转冲击钻进的减振与提速机理研究

祝效华;汤历平;童 华

振动与冲击 ›› 2012, Vol. 31 ›› Issue (20) : 75-78.

PDF(1591 KB)
PDF(1591 KB)
振动与冲击 ›› 2012, Vol. 31 ›› Issue (20) : 75-78.
论文

高频扭转冲击钻进的减振与提速机理研究

  • 祝效华,汤历平,童 华
作者信息 +

Study on damping and speed-raising mechanism of high frequency torsional impact drilling

  • ZHU Xiao-hua, TANG Li-ping, TONG Hua
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摘要

高频扭转冲击钻井是一种能大幅提高钻井效率的新兴钻井技术,但由于对其破岩机理认识不清,使得高频扭转冲击钻井技术未能在国内推广应用。基于弹塑性力学和岩石力学,采用Drucker-Prager准则作为岩石的本构关系,塑性应变作为岩石破碎的失效判据。通过有限元方法建立全尺寸PDC钻头动态破岩的非线性动力学三维仿真模型,分析了高频扭转冲击作用下硬地层中钻头的动态破岩过程。结果表明,高频扭转冲击钻进硬地层时拉应力与压应力区域交叉出现且以拉应力为主,较以压应力为主的常规钻进可大幅提高钻头的机械钻速;高频扭转冲击钻进有效地减弱了硬地层中钻头处的粘滑振动,大大地提高了钻头的破岩效率。研究成果有助于深化对高频扭转冲击破岩的认识,为高频扭转冲击钻井技术的应用提供理论依据。

Abstract

High frequency torsional impact drilling is a new emerging drilling technology, which can enhance the drilling efficiency by a large margin. But it is not popularized interiorly due to ignorance of its rock breaking mechanism. A 3D non-linear dynamic simulation model of dynamic rock breaking with full gauge PDC bit is established, in which the finite element model is created based on elastoplastic mechanics and rock mechanics. The constitutive relation of rock is controlled by Drucker-Prager law and plastic strain is adopted to judge the rock breaking. The dynamic rock breaking process of bit under high frequency torsional impact in tough formation is analyzed. Results show that most of the rock elements are damaged by the pulling stress, with which the ROP are enhanced greatly. The high frequency torsional impact mitigate stick-slip vibration effectively and increase the rock breaking efficiency greatly. The research achievements provide theoretical basis for deep understanding and popularizing the high frequency torsional impact drilling technology.

关键词

硬地层 / 钻井技术 / 高频扭转冲击 / 岩石破碎 / 机械钻速

Key words

tough formation / drilling technology / high frequency torsional impact / rock breaking / rate of penetrate

引用本文

导出引用
祝效华;汤历平;童 华. 高频扭转冲击钻进的减振与提速机理研究[J]. 振动与冲击, 2012, 31(20): 75-78
ZHU Xiao-hua;TANG Li-ping;TONG Hua. Study on damping and speed-raising mechanism of high frequency torsional impact drilling[J]. Journal of Vibration and Shock, 2012, 31(20): 75-78

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