盲孔法测试膨胀管残余应力研究
Measurement of Residual Stress of Expandable Tubular with the Blind-Hole Method
张绪亮 1秦浩 1郭慧娟 2刘凯 3邹光贵 1王宝栋2
作者信息
- 1. 塔里木油田油气工程研究院
- 2. 中国石油集团工程技术研究院有限公司
- 3. 中航凯迈(上海) 红外科技有限公司
- 折叠
摘要
膨胀管在膨胀作业结束后,会残留分布不均的残余应力,残余应力将会影响膨胀管胀后抗外挤强度、抗腐蚀强度等关键性能.为此,采用盲孔法测试膨胀管外表面轴向残余应力与环向残余应力水平及变化情况,通过有限元法获得残余应力整体分布情况并加以验证.研究结果表明:膨胀管的胀后残余应力近外壁面 2mm内平均环向和轴向残余应力测试值分别为-352.5 与-589.0 MPa,与有限元模拟值误差小于 10%;环向残余应力的中性面在沿壁厚方向距内壁面约70%厚度处,轴向残余应力的中性面在沿壁厚方向距内壁面约 64%厚度处;膨胀管胀后并经过多天存放,轴向残余应力降幅为18.7%,环向残余应力降幅为 12.8%.所得结论可为膨胀管性能评价研究提供技术参考.
Abstract
In the operation with expandable tubular,uneven residual stress often occurs to impede the me-chanical properties(e.g.collapse resistance and corrosion resistance)of the tubular.In this paper,the blind-hole method was adopted to measure the axial and circumferential residual stresses on the external surface of the ex-pandable tubular after expansion.The overall distribution of residual stress was obtained from finite element simula-tion(FES)and then verified.The results show that the average circumferential and axial residual stresses within 2 mm to the outer wall of the expandable tubular are measured to be-352.5 MPa and-589.0 MPa,respectively,with the error of less than 10%relative to the FES values.The neutral surface of the circumferential residual stress appears at about 70%of the wall thickness towards the inner wall,and the neutral surface of the axial residual stress occurs at about 64%of the wall thickness towards the inner wall.When the expandable tubular is stored for days after expansion,the axial and circumferential residual stresses reduce by 18.7%and 12.8%,respectively.The study results provide a reference for the performance analysis of expandable tubular.
关键词
膨胀管/残余应力/盲孔法/应变释放系数/有限元模拟Key words
expandable tubular/residual stress/blind-hole method/strain release coefficient/finite ele-ment analysis引用本文复制引用
基金项目
中国石油天然气集团有限公司科学研究与技术开发项目(2021DJ4102)
出版年
2024
NETL
NSTL
万方数据