论文部分内容阅读
应用井眼稳定力学理论和H -B非线性准则 ,建立了井眼围岩力学滑移破坏方程 .采用迭代方法和编制的VB - 5计算机程序进行了计算 ,并绘制了倾斜地层中井眼围岩发生剪切滑移破坏典型的关系曲线 .结果表明∶原地应力、地层倾角和岩石力学特性等参数是影响井眼滑移破坏的重要因素 .在给定条件下 ,径向坐标与井眼半径的比越大 ,越容易发生滑移破坏 .在坐标幅角为 6 0°,2 4 0°时 ,滑移半径最小 ,在坐标幅角为 0°(36 0°) ,180°时 ,滑移半径最大 .支撑力随岩石的抗压强度增大而减小 ,随瞬时摩擦角的增加而增大 .
Applying the theory of borehole stability mechanics and H - B nonlinear criterion, the mechanical failure failure equation of wellbore surrounding rock was established, and the calculation method was established by using the iterative method and the programmed VB - 5 computer program, and the borehole surrounding rock The typical relationship curve of shear-slip failure occurred.The results show that the parameters of in-situ stress, formation dip and rock mechanics are the important factors affecting the wellbore slip failure.Under the given conditions, the radial coordinates and borehole radius The slip slip is more likely to occur.The sliding radius is the smallest when the angular range is 60 ° and 240 °, and the slip radius is the smallest when the angular range is 0 ° (36 °) and 180 ° The radius of the largest move.The supporting force decreases with the increase of compressive strength of rock, increases with the instantaneous friction angle increases.