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 forUnconventional Oil and Gas Wells

作　　者：汪强 晁利宁[1,2] 白天娇 焦炜[1,2] 苑清英 杨晓龙 郭鹏[2] WANG Qiang;CHAO Lining;BAI Tianjiao;JIAO Wei;YUAN Qingying;YANG Xiaoong;GUO Peng(Chinese National Engineering Research Center for Petroleum and Natural Gas Tubular Goods Co.,Ltd.,Xi'an 710018,China;CNPC Baoji Petroleum Steel Pipe Co.,Ltd.,Baoji 721008,Shaanxi,China;PetroChina Coalbed Methane Company Limited,Beijing Material Branch,Beijing 102206,China)

机构地区：[1]中油国家石油天然气管材工程技术研究中心有限公司,西安710018 [2]中国石油宝鸡石油钢管有限责任公司,陕西宝鸡721008 [3]中石油煤层气有限责任公司北京物资分公司,北京102206

出　　处：《焊管》2024年第3期28-34,共7页Welded Pipe and Tube

基　　金：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)。

摘　　要：针对实物套管的几何尺寸缺欠、屈服强度变化、屈服强度周向分布不均等因素,建立了含缺欠的套管有限元模型,并基于弧长法进行了套管抗挤毁性能分析,研究了均匀外压作用下,几何尺寸缺欠、屈服强度变化对套管的抗挤毁性能影响规律。通过有限元分析得出,套管尺寸公差在要求范围内时,当管体几何形状存在椭圆度和壁厚不均度缺欠时,椭圆度对套管抗挤毁性能的影响程度大于壁厚不均度;在套管椭圆度和壁厚不均度一定的情况下,管体的抗挤毁结果随着屈服强度的升高而增加,模拟计算结果与理论计算结果差值不断减小;平均屈服强度一定时,管体屈服强度沿周向分布越均匀,套管的抗挤毁性能越好;周向屈服强度越均匀,管体的抗挤毁强度越好。结合有限元分析与实物试验结果可以得出,通过测量套管实物最小壁厚和最大椭圆度等几何尺寸缺欠,可更精准地预测套管外压挤毁性能。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 

分 类 号：TE375[石油与天然气工程—油气田开发工程]