浅海井口抗冰装置结构计算的有限单元法  

FINITE ELEMENT METHOD FOR STRUCTURAL ANALYSIS OF WELLHEAD PROTECTOR SYSTEM IN IC E LOADING

作　　者：段梦兰[1] 陈文森[2] 陈德春 陈莹 王维明[3] 

机构地区：[1]中国船级社,北京100006 [2]辽河油田钻采工艺研究院,辽宁盘锦124011 [3]中国科学院力学研究所,北京100083

出　　处：《石油学报》2000年第1期96-101,共6页Acta Petrolei Sinica

摘　　要：对辽东湾浅海单井井口保护装置采用隔水套管直接抗冰的可行性进行了研究。采用多种三维混合单元建立了一典 型井口装置的有限元计算模型，该模型利用有限差分的原理真实地反映了地层对结构的约束。计算结果表明，在辽东湾浅 海的６０ｃｍ单层平整冰作用下，结构的位移和应力都在许可范围之内，最大位移为结构的顶部，最大应力发生在隔水套管 与表层套管的上部连接环板上，而隔水套管内加固的水泥层对增加结构的强度、抵抗外载荷的作用起了不可忽视的作用。 计算结果和现场两年多的应用表明，用增厚的隔水套管直接抗冰是可行的。Design of wellhead protector system against ice loading is an important problem in oil development in shallow waters in Liaodongwan, Bohai Gulf. To investigate the stress state of the developed protector system using the riser to directly r esist ice loading, types of joint three dimension finite elements and many bound ary elements are used to model the layers of steel pipes and cement or concrete to establish the FE structural model of the system. The constraint conditions of the soil deposits to the structures are modeled by finite difference method. An ice sheet of 60mm thickness in extreme conditions is supposed to act on the thi ckened riser. The detailed analysis of stresses and displacements of the struct ure shows that the maximum displacement is at the top of the structure and the m aximum stress in the top round plate connecting the riser and the outermost casi ng, with all the displacements and stresses in the system being in the allowed r anges. It is seen that the cemented concrete layers between the casings take ver y active part in increasing the strength of the structure.

关 键 词：井口装置 隔水套管 有限元 抗冰装置 海上油田 

分 类 号：TE951.03[石油与天然气工程—石油机械设备] TE951.02