削球式及椭圆回转式钻井井壁底力学性能分析

Mechanical Properties Analysis of Snick and Ellipse Rotation Shaft Bottom of Shaft Lining Drilled

钻井法凿井是采用大型钻井机经一次或几次扩孔施工竖井井筒的方法,钻井底部井壁底结构承受最大的水泥浆压力,容易发生破坏。根据钻井井壁底飘浮下沉中的实际工况建立模型,采用ANSYS计算软件对削球式和椭圆回转式2种井壁底的力学性能进行有限元分析,分析2种井壁底的应力分布规律和受力的主要影响因素,同时选取受力形式相对较好的削球式和椭圆回转式模型进行关键点受力比较,提出了对深厚表土层钻井井壁底的最佳结构形式,为今后采用钻井设计与施工时选择最佳井壁底结构形式提供参考。

Drilling method using large drilling the well is cut by one or several times to enlarge the hole of the borehole vertical shaft construction method,structural of shaft lining bottom is endure the biggest water structure pressure mud and easy to destroy.According to actual operating the shaft lining bottom drifting in the submersion to build model,applied the ANSYS software to carry on its mechanics performance of finite element analysis,obtained shaft lining bottom stress distribution rule and major effect factor of stress,simultaneously carried on stress analysis and comparison to two different pattern of Snick and ellipse rotation shaft lining bottoms,proposed to the best shaft lining bottom structure pattern in deep surface soil,provided some theory reference for shaft lining bottom’s application.