摘要
基于煤层开采条件下上覆岩层的运动规律,采用Ansys软件建立了钻井套管剪切变形数值模拟模型,研究了轴向拉应力对套管剪切变形时的应力特征的影响规律。结果表明随着套管承受拉应力的增大,剪切面上Mises应力最大值和套管上承受较大Mises应力的区域面积均增大,说明拉应力越大,套管越易发生剪切破坏,且套管易发生剪切破坏的区域也越大。研究结论解释了工程中套管剪切破断的区域主要位于软硬岩层交界处(上硬下软组合)和关键层区域的原因。
Based on the coal overlying rock motion law, established the numerical simulation model of drilling casing shear deformation by using Ansys software to study the influence laws of axial tensile stress on stress characteristics of drilling casing during shear deformation, the results show that with the increase of the casing tensile stress, the maximum value Mises stress on the shear surface and the casing Mises stress area were increased, indicating the tensile stress is larger, the casing more is prone to shear failure and shear failure zone is greater. The research results show that the reasons for the casing shear fracture in the engineering are mainly located at the boundary of soft and hard rock strata （the combination that the upper is hard, the lower is soft ） and key stratum.
作者
耿新泽
方晓辉
昌立鹏
Geng Xin-ze Fang Xiao-hui Chang Li-peng(School of safety engineering, China University of Mining and Technology, Jiangsu Xuzhou 221116)
出处
《山东煤炭科技》
2017年第9期53-54,57,共3页
Shandong Coal Science and Technology
基金
国家级大学生创新训练项目(201510290041)
项目名称为采动区地面钻井固井套管力学特征研究
