石油膨胀套管的力学性能及膨胀后的残余应力.pdfVIP

44 7 西 安 交 通 大 学 学 报 Vol. 44 l 7 2010 7 JOU RNA L OF XIcAN JIAOT ONG UNIVER IT Y Jul. 2010 1 2 1 1 2 , , , , ( 1. , 257017, ; 2. , 710049, ) : 针对选用的X52石油膨胀套管, 通过不同的热处理工艺进 一步改善 膨胀性能, 研究了膨 胀加工前后材料性能的变化规律. 对于经扩径膨胀率达20% 的管材, 使用应力释放法测量了膨胀 前后内外壁及焊缝熔合区热影响区的轴向和环向残余应力. 结果表明: 经扩径膨胀后, 管外壁的轴 向和环向残余应力均为残余压应力, 焊缝熔合区和热影响区的残余应力由拉应力向压应力转化, 中轴向残余应力变化幅度较大; 管内壁膨胀后轴向与环向的残余应力均为残余拉应力. 另外, 对于 不同膨胀率下力学性能与残余应力之间的关系中呈现的异常现象也进行了分析. : 膨胀套管; 力学性能; 残余应力; 热处理 : TG142 : A : 0253O987X( 2010) 07O0090O05 Mechanical Properti es of Expansi on Casing and Residual Stress after Expansion 1 2 1 1 2 T ANG M ing , WANG Lulu , MA Jianzhong , NING Xuetao , MA Xinpei ( 1. Drilling T echnology Research Institute of hengli Petr oleum Administration, Dongying, handong 257017, China; 2. tate Key Laboratory for Mechanical Behavior of Materials, Xican Jiaotong U niver sity, Xican 710049, China) Abstract: The expansion properties of X52 pipe w ere improved by heat treatment process, and the performance difference before and after expansion w as investigated. For pipes w ith diameter expansion up to 20% , the axial and circumferential residual stresses on inside and outside w alls, w eld fusion zone and heat-affected zone w ere measured by the stress releasing method. The re- sults show that both the axial and circumferential residual stresses on the outside w all of the pipe are compressive after expansion, and in the w eld fusion zone and w eld heat affected zone the re- sidual stress varies from tensile to compressive, especially for the axial residual stress. On the i