基于统一强度理论的套管全管壁屈服挤毁压力  

Through-wall yield collapse pressure of casing based on unified strength theory

作　　者：林元华[1] 邓宽海[1] 孙永兴[2] 曾德智[2] 

机构地区：[1]西南石油大学油气藏地质及开发工程国家重点实验室 [2]西南石油大学石油管工程重点实验室

出　　处：《石油勘探与开发》2016年第3期462-468,共7页Petroleum Exploration and Development

基　　金：国家自然科学基金项目(51274170)

摘　　要：在充分考虑套管拉压强度差、中间主应力、材料硬化、屈强比对套管全壁屈服挤毁压力影响的基础上,根据统一强度理论推导均匀外压下套管全壁屈服挤毁压力的统一算法。该方法适合于计算具有拉压强度差效应和中间主应力效应的套管挤毁强度;建立了VON MISES、TRESCA、GM、双剪屈服4种典型屈服准则下的全壁屈服挤毁公式,其中双剪屈服准则下计算公式的计算值最大,可作为全壁屈服挤毁压力设计的上限,TRESCA屈服准则下计算公式的计算值最小,可作为全壁屈服挤毁压力设计的下限。数据计算对比表明,新全壁屈服挤毁公式的计算值比其他公式更接近实验值。The unified algorithm of through-wall yield collapse pressure for casing with due consideration of strength differential（SD）, yield-to-tensile strength ratio, material hardening and intermediate principal stress, which is suitable to calculate collapse strength of all casing has been obtained based on unified strength theory, and four classical through-wall yield collapse formulas of casing have been presented based on the L.Von Mises, TRESCA, GM and twin yield strength criterion. The calculated value is maximum based on the twin yield strength criterion, which can be used as upper limit of through-wall yield collapse pressure, and the calculated value is minimum based on the TRESCA strength criterion, which can be used as lower limit of through-wall yield collapse pressure in the design process. Numerical and experimental comparisons show that the equation proposed by this paper is much closer to the collapse testing values than that of other equations.

关 键 词：统一强度理论 套管挤毁 全壁屈服 挤毁压力 拉压强度差 中间主应力 

分 类 号：TE256[石油与天然气工程—油气井工程]