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为了研究约束内壁法对特殊地层条件下井筒的治理效果,应用空间轴对称弹性理论建立了相应力学模型的受力分析方法.获得了井壁处于约束治理条件下的圣维南解,计算了某实际井筒在不同大小约束力作用下治理前后的相当应力变化.结果表明:井壁内侧的相当应力在治理前远大于外侧,治理后获得较大程度的减少,沿径向的相当应力曲线逐渐趋于水平;随着约束力增大,约束段内缘附近各点的相当应力减小.约束内壁方法通过提高井壁内缘这一薄弱环节的安全性,达到了增强井壁整体抗破坏能力的目的;约束段内缘附近的治理效果随约束力增大而越佳.
In order to study the effect of constrained wall method on the wellbore under special strata conditions, a stress analysis method of the corresponding mechanical model is established by using the space axisymmetric elasticity theory, and the Saint-Venant solution of wellbore under constrained treatment conditions is obtained. The results show that the considerable stress in the inner side of well bore is much larger than that in the outer side before the treatment, and is reduced to a great extent after treatment, while the corresponding stress curves in the radial direction gradually converge At the same time, with the increase of the restraint force, the equivalent stress of each point near the inner edge of the restraint section decreases.The restraining method of the inner wall can improve the overall damage resistance of the shaft wall by increasing the safety of the weak link at the inner edge of the sidewall. Purpose; The constraint effect near the inner edge of the binding effect increases with the better.