焊管2024，Vol.47Issue(3)：28-34,7.DOI:10.19291/j.cnki.1001-3938.2024.03.004
非常规油气井用套管抗挤毁性能有限元分析
Finite Element Analysis of Anti-collapse Performance of Casing for Unconventional Oil and Gas Wells
摘要
Abstract
A finite element model of casing with defects was established to address the geometric size deficiencies,the yield strength variations,and the uneven circumferential distribution of yield strength.Based on the arc length method,the anti collapse performance of the casing was analyzed,and the influence of the geometric dimension deficiencies and the yield strength changes on the anti collapse performance of the casing under uniform external pressure was studied.Through finite element analysis,it is found that when the dimensional tolerance of the casing is within the required range,the influence of ovality on the anti collapse performance of the casing is greater than that of wall thickness unevenness when there are imperfection such as ovality and wall thickness unevenness in the geometric shape of the casing.When the ovality and wall thickness unevenness of the casing are constant,the anti-collapse result of the pipe body increases with the increase of yield strength,and the difference between the simulated calculation results and the theoretical calculation results continuously decreases.When the average yield strength is constant,the more uniform the circumferential distribution of the yield strength of the pipe body,the better the anti collapse performance of the casing.When the circumferential yield strength of the pipe body is uniform,the yield strength and anti collapse resistance are the highest.By comparing finite element analysis with physical experiments,it can be concluded that the external pressure anti collapse performance of the casing can be more accurately predicted by measuring the geometric size imperfections of the casing,such as minimum wall thickness and maximum ovality.关键词
套管/外压挤毁/有限元分析/几何尺寸/屈服强度Key words
casing/external pressure collapse/finite element analysis/geometric dimensions/yield strength分类
能源科技引用本文复制引用
汪强,晁利宁,白天娇,焦炜,苑清英,杨晓龙,郭鹏..非常规油气井用套管抗挤毁性能有限元分析[J].焊管,2024,47(3):28-34,7.基金项目
陕西省重点研发项目"多段体积压裂井用高性能SEW管材及螺纹连接关键技术研究"(项目编号2023-YBGY-309). （项目编号2023-YBGY-309）
