In recent years, oil and gas pipes and risers in deep sea reservoirs are required to have high resistance to collapse. This paper reports the comprehensive investigation of the residual stress distributions in a recently developed seam-welded offshore gas transmission riser of high-strength steel. Experimental hole drilling methods are applied to understand the residual stress distribution in the real scaled riser. Then, FE modelling on double-V groove is performed for a systematic parametric residual stress analysis of the riser components with consideration of parameters including the ratio of component radius to wall thickness (r/t), joint preparation, pass size, and heat input. Through the use of a residual stress decomposition technique, the thickness-through-thickness residual stress is partitioned into membrane and bending stresses. According to the results of the parametric study, a method for prediction of residual stress in circumferential direction is developed based on simplified empirical formulas for existing riser configurations with varying welding conditions.

近年来，要求深海储层中的油气管道和立管具有较高的抗塌陷能力。本文报告了对最近开发的高强度钢缝焊海上天然气传输立管中残余应力分布的综合研究。应用实验性钻孔方法来了解实际比例冒口中的残余应力分布。然后，在双V型槽上进行有限元建模，以对立管组件进行系统的参数化残余应力分析，并考虑到包括组件半径与壁厚之比（r / t），接头准备，焊道尺寸和热量输入。通过使用残余应力分解技术，厚度厚度残余应力可分为膜应力和弯曲应力。根据参数研究的结果，基于简化的经验公式，针对存在变化焊接条件的现有立管构型，开发了一种预测周向残余应力的方法。