关键词: 定向井, 有杆抽油系统, 抽汲参数, 优化设计, 仿真模型

Abstract: The factors affecting the axial vibration of pumping rod string,including the directional well track,the friction force between pumping rod string and tubing, the polished rod movement of pumping unit and complex boundary conditions of pump were analyzed.The simulation models for axial vibration of rod string in directional wells were set up.The dynamometer cards for the polished rod of pumping unit can be automatically and rapidly simulated by using this model.On the basis of simulated dynamometer cards,the mathematical models for simulating efficiency of pumping system were set up.By simulating the dynamic parameters of rod pumping system in the directional wells,the effects of well track on friction force between rod string and tubing,friction power and the efficiency of rod pumping system in the directional wells were analyzed.The constraint conditions such as the accordance condition of output of oil wells,programming output,bearing capacity of pumping unit,strength condition of rod string and utilization ratio of motor's power were integrated.The maximum efficiency of rod pumping system was taken as the objective function,and the simulating and optimizing method of the suction parameters in the directional wells was proposed.The corresponding computer software was developed.The application to field showed that the computer software had high simulating accuracy.

Key words: directional wells, rod pumping system, suction parameters, optimization design, simulation models