六级分支井分岔装置有限元仿真分析研究  

Analysis of the Level 6 Multilateral Branching Device by Finite Element Simulation

作　　者：邓治国[1,2] 李春福[1,2] 张丛雷 文平[2] 肖淇[2] 王燕群[3] 

机构地区：[1]西南石油大学油气藏地质与开发工程国家重点实验室 [2]西南石油大学材料科学与工程学院 [3]天津大学机械工程学院

出　　处：《石油机械》2015年第1期27-31,37,共6页China Petroleum Machinery

基　　金：中石油长城钻探工程有限公司工程技术研究院项目"六级分支井分岔装置加工及试验"(B049)

摘　　要：采用有限元仿真方法,根据结构失稳理论分析六级分支井分岔装置在20 MPa内压作用下相贯线部分出现鼓包变形问题。首先,模拟双相钢和IF钢不同壁厚、管径的六级分支井分岔装置在内压作用下的变形及应力分布,并测量分岔装置最大鼓包变形量与位置。然后,通过未加压分岔装置相贯线截面与加压变形后相同位置截面对比分析,发现相贯线截面存在的结构几何缺陷与厚度缺陷导致分岔装置变形,得出六级分支井分岔装置结构失稳极值点位置和导致最大鼓包变形的最大几何缺陷;在内压作用下,六级分支井分岔装置相贯线部分产生的变形主要是不稳定结构趋向平衡稳定结构变化的过程。该项研究结果对分岔装置的稳定性设计和校核具有重要意义。By using the finite element simulation, the branching device of the level 6 multilateral well 15 ana- lyzed based on the structural instability theory. With the inner pressure of 20 MPa, bulge deformation is appeared on the intersecting line. The deformation and stress distribution of the branching device made by the duplex steel and IF steel with different wall thicknesses and diameters under inner pressure are simulated. The maximum bulge deformation and the location are measured. Compared with the cross section of the original intersecting line and the deformed intersecting line, it is concluded that the defects of intersecting line cross section geometry and thickness lead to the deformation of the branching device. The structure instability extreme point position on the branching de- vice is determined. The maximum geometrical defects lead to the bulge deformation. With the internal pressure, de- formation of the intersecting line of the branching device is primarily caused by the process from unstable structure to the balanced and stable structure.

关 键 词：六级分支井 分岔装置 有限元 结构失稳 仿真 

分 类 号：TE931[石油与天然气工程—石油机械设备]