关键词: 石油钻机井架, 极限承载力, 仿真模型, 双重非线性理论, 测试应力, 模型修正

Abstract: According to the mechanical behaviors of in-service oil drilling derrick, the simulation model for forecasting the ultimate bearing capacity of oil drilling derrick was established on the basis of the double nonlinear theory. Taking the testing stresses as the key indicators and the relevant design parameters as the updating objects, the updating theory for simulation model was studied. The destruction test and analogue simulation of the oil drilling derrick model in laboratory were carried out. The experimental results showed that the actual destruction point was basically consistent with that of analogue simulation. The simulated error of the ultimate bearing capacity was also small, which verifies the correctness of this simulation model. The simulation analysis of A-shaped and K-shaped oil drilling derricks widely used in oilfield was made on the basis of dynamic strain testing. The ultimate bearing capacity, the relations between loading and stress, the structural failure mode and dangerous points of the derricks were determined. Those results provided the important reference for safety and steady operation of oil drilling derricks.

Key words: oil drilling derrick, ultimate bearing capacity, simulation model, double nonlinear theory, testing stress, model-updating theory