赵东油田老平台T型管节点极限承载力弱化规律研究

Study on the Weakening Law of the Ultimate Bearing Capacity of T-tube Joints on the Old Platform of Zhaodong Oilfield

赵东油田一期建设的导管架平台在长达20年服役期内,长期承受恶劣的海洋环境载荷,将会产生裂纹和腐蚀等缺陷。此类缺陷的出现必然对平台结构,特别是管节点结构的极限承载力产生巨大影响。本文针对赵东油田ODA老平台典型T型管节点结构,通过建立考虑裂纹和腐蚀损伤的管节点非线性有限元模型,研究了管节点上出现的腐蚀和裂纹等损伤对其极限承载力的影响,掌握了裂纹、腐蚀各参数及其联合作用下管节点极限承载力变化规律,为赵东老平台管节点的安全评估和运营维护提供了有力的技术支持。

During the 20 years service period,the jacket platform constructed in the first phase of Zhaodong Oilfield will withstand harsh marine environmental loads for a long time,which will cause defects such as cracks and corrosion.The appearance of such defects will inevitably have a huge impact on the ultimate bearing capacity of the platform structure,especially the tubular joint structure.In this paper,aiming at the typical T-shaped tubular joint structure of the old ODA platform in Zhaodong Oilfield,by establishing a nonlinear finite element model of tubular joints considering cracks and corrosion damage,the influence of corrosion and cracks on tubular joints on the ultimate bearing capacity is studied.The change law of the ultimate bearing capacity of tubular joints under the action of crack and corrosion parameters and their combined action has been mastered,which provides strong technical support for the safety assessment and operation and maintenance of tubular joints on the old platform of Zhaodong.