海洋平台膨胀弯结构安装极限尺寸分析

Analysis of the installation limit size of spool piece of offshore platforms

海底管道膨胀弯安装是铺设海底管道施工过程中的重要组成部分。由于在生产制造海洋管道过程中存在加工误差,另外施工中对接膨胀弯管与海洋立管或者海底平管也存在偏差,因此安装膨胀弯过程中存在极限尺寸偏差方面的问题。本文运用有限元分析软件ABAQUS,按照实际结构尺寸和材料参数建立带有法兰接头的膨胀弯仿真模型,针对实际安装膨胀弯过程中存在的三种类型的偏差工况,在满足实际施工对海管强度要求规范下,计算膨胀弯安装极限尺寸偏差,并得到结构在不同工况下的应力和应变的分布情况。详细讨论和分析膨胀弯在安装对接立管和平管过程的受力与形变情况。得到的相关结论有望为海洋平台中海管实际施工安装提供相应的理论依据,对海上油气田的开发建设具有一定的工程意义。

The installation of spool pieces of submarine pipelines is important in the construction of newly laid submarine pipelines.Due to the manufacturing errors in the process of producing marine pipelines,as well as the offset between the spool piece and offshore riser or the submarine horizontal pipes,the problem concerning the limit size offset of spool piece naturally emerges during installations.In this paper,the finite element analysis software ABAQUS was employed to establish the simulation model of a spool piece with flange joint based on the practical structural configuration and material parameters.As for the three typical situations in the practical process of the spool piece installation,the stress and strain distribution of the struc⁃ture were obtained.Furthermore,the limit size offsets of the spool piece were calculated under the condition of satisfying the practical strength requirement.The mechanics and deflections of the spool piece during in⁃stallation were discussed and analyzed in detail.The relevant conclusions are expected to provide the corre⁃sponding theoretical basis for the practical construction of the offshore platforms.And the research could have some engineering significance for the development and construction of offshore oil and gas fields.