基于API标准的浮式平台塔形井架有限元计算

Finite Element Calculation of T-shaped Derrick on Floating Platform based on API Standard

半潜式钻井平台的塔形井架承载大、高度高、工况恶劣,需重点校核其变形和应力。以某塔形井架结构及海洋环境数据为对象,建立井架有限元模型,采用API Spec 2C—2004规范确定井架的等效计算载荷,通过ANSYS软件模拟计算设计载荷作用下井架的变形位移及应力分布。结果表明,井架可满足正常作业工况下的强度要求;但在设计生存工况下井架的最大变形发生在井架顶端,达到30.28mm,最大应力发生在井架地脚与平台连接处,达到305 MPa,接近材料的屈服极限,需要引起高度关注。研究结果可为半潜式钻井平台井架设计计算与安全评定提供一定的参考。

T-shaped derrick on the semisubmersible drilling platform has large load capacity,high altitude and bad working conditions,needs to focus on the calculation and checking.Taking a T-shaped derrick structure and marine environment data for the object,finite element model of the derrick is built.The API Spec 2C-2004 specification is used to determine the equivalent computa-tional loads of the derrick,and ANSYS simulation software is used to calculate the deformation displacement and stress distribution of derrick under the designed loads.The results show that the derrick can meet the strength requirement in normal operating condition,but the maximum de-formation of derrick living in designed and survival conditions occurs at the top of the derrick,up to 30.28 mm,the maximum stress occurs in the joint of derrick foundation and platform,reaches 305 MPa,close to the yield limit of the material,need to pay high attention.The research results can provide a certain theoretical reference for the designed calculation and safety assessment of derrick on semisubmersible drilling platform.