【摘要】 旋冲钻井技术可有效提高硬地层、易斜地层的机械钻速。以弹性力学、波动理论和冲击动力学为基础, 采用室内试验和力学理论相结合的研究方法,建立了旋冲钻井破岩力学模型。在该模型的建立过程中,首先根据冲击器的工作原理,结合冲击动力学,对旋冲钻井中冲击动载作用下的破岩过程进行了简化;假设岩石为弹性介质,根据弹性力理论,分析了轴向力和剪切力作用下岩石的受力状态;对在室内进行的载荷侵入深度曲线的试验结果进行分析,得出岩石所受外载荷与侵入深度成一定的线性关系;结合波动理论,分析了冲击动载作用下岩石的应力状态。建立的破岩力学模型对旋冲钻井的进一步发展具有重要的现实意义。更多还原

【Abstract】 The rotary and percussive drilling technology can effectively increase ROP in hard formations. By using elastic mechanics, wave dynamics and impacting dynamics, rock crushing mechanics model of rolary and percussive drilling is established based on lab experiments and theoretical analyses. According to impacting dynamics and working principle of impactor. the rock-crushing process of dynamic impacting load is simplified, By means of elastic mechanics and wave theory, the axial force and shearing force of rock is analyzed, and the linear relation between dynamic impacting load and invasion depth is obtained by analyzing the test results. Also the stress stale of rock is analyzed. The conclusions made in this paper are important for further development and application of rotating and percussive drilling.更多还原