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日益复杂的油气井钻采条件使得油井管柱面临越来越苛刻的载荷工况,油井管接头作为整个管柱的薄弱环节,其失效问题非常突出。实物实验费用昂贵、实验周期长,且复杂载荷工况难以施加,无法满足实际要求。该文基于油井管接头三维全尺寸弹塑性有限元分析,构建了复杂载荷下油井管接头数值仿真平台,是实物实验的一个有力补充。该仿真平台所得极限工作扭矩与API标准提供数据基本吻合(零轴向力条件下),同时具有分析复杂工况条件下油井管接头三维力学特性的能力。通过该仿真平台,能很好地描述复杂载荷作用下油井管接头的受力特征,快速、全面地评估复杂载荷作用下油井管接头的连接强度和密封性能,明确油井管接头的极限载荷工况。
The increasingly complex oil and gas well drilling conditions make the oil well tubular column face more and more severe load conditions. As the weak link of the whole pipe string, oil well joint fittings have outstanding failure problems. In-kind experiments are expensive, long experimental cycles, and difficult to exert complex load conditions, can not meet the actual requirements. Based on the three-dimensional full-scale elasto-plastic finite element analysis of oil well pipe joint, this paper constructs the numerical simulation platform of oil well pipe joint under complex load, which is a powerful supplement to physical experiment. The limit working torque obtained by the simulation platform is basically consistent with the data provided by the API standard (under the condition of zero axial force), and has the ability to analyze the three-dimensional mechanical characteristics of the oil well pipe joint under complicated working conditions. Through the simulation platform, the stress characteristics of oil well pipe joints under complex loads can be well described, and the connection strength and sealing performance of oil well pipe joints can be evaluated quickly and comprehensively. The ultimate load conditions of oil well pipe joints can be determined clearly.