二阶效应和几何缺陷对井架稳定性的影响研究

Influence of Second-order Effects and Geometric Defects on Derrick Stability

AISC360-2016二阶分析需要考虑的因素众多,钻机(井架)结构有特殊性。文中分析了稳定分析需要考虑的因素及对应处理方法,着重分析了二阶效应和几何缺陷的影响,依据AISC360-2016验证了SACS软件的二阶效应分析能力,然后采用SACS软件,结合某井架分别采用一阶分析和考虑假想力的二阶分析,以及不考虑假想力的二阶分析3种情况,通过对计算结果的对比分析,对AISC360-2016二阶分析对石油钻机井架计算的影响进行了分析研究。结果表明:SACS软件具有二阶分析的功能;二阶分析对石油钻机的结构计算影响较大,而假想水平力的影响较小;计算中应同时考虑P-Δ效应和P-δ效应,可以不考虑假想水平力的影响。按旧版标准计算的钻机结构重新启用时应慎重,通过严格计算并采取加强措施。对石油钻机井架的稳定性计算有一定的指导和借鉴意义。

The AISC360-2016 second-order analysis needs to consider many factors,and the structure of the drilling rig(derrick)has particularity.This paper analyzes the factors that need to be considered in the stability analysis and the corresponding processing methods,and focuses on the analysis of the second-order effect and the influence of geometric defects.According to AISC360-2016,the second-order effect analysis capability of the SACS software is verified.Using SACS software,combined with a certain derrick,the first-order analysis,the second-order analysis considering the imaginary force,and the second-order analysis without considering the imaginary force are used in three cases.Through the comparative analysis of the calculation results,the influence of the AISC360-2016 second-order analysis on the calculation of the oil rig derrick is analyzed.The results show that the SACS software has the function of second-order analysis;the second-order analysis has a greater impact on the structural calculation of oil rigs,while the imaginary horizontal force has less impact.In the calculation,the P-Δeffect and the P-δeffect should be considered at the same time,and the effect of the imaginary horizontal force may not be considered.The drilling rig structure calculated according to the old standard should be reactivated with caution,strict calculation and strengthening measures should be taken.It has certain guidance and reference significance for the stability calculation of oil drilling rig derrick.