There Are Two-dimensional Numerical Simulation Of Oil Research Rod Pumping System

Sucker rod pump is the main artificial lift methods, and also is widely used in heavy oil production. The force and deformation of down-hole sucker string in directional wells are more complex for the deviation angle of well and the viscosity of the fluid. New prediction pattern of heavy oil rod pumping system behavior has been modeled to design and adjust the parameters, so the rod pump system would be more efficient and energy-saving. The calculation of viscous damping coefficient is very important in rod pumping system behavior model, and now it is necessary and critical to analyze these calculation methods because there are too much models to define the coefficient. In this paper completed the following work:(1)Based on the analysis of mechanical behavior of the sucker string in directional heavy oil well and Gibbs one-dimensional equation, considered the impact of the change rule of the deviation angle of well and the force to sucker rod by oil tube, the two-dimensional prediction pattern was modeled. The results show that Two-dimension model is more accurate in predication of the force and deformation of down hole sucker string in directional wells, which was demonstrated by comparing the data of one-dimension and two-dimension in the91075well of Hongshanzui heavy reservoir, and also the viscosity of the fluid and the deviation angle of the well have great impaction on the polished rod load. different parameters for comprehensive effect of sucker rod pumping system, including the changing of dynamic liquid level depth, sucker pumping rod diameter, inside diameter of the tube, the diameter of the pump, oil pump swabbing parameter and so on.(2) The viscous damping coefficient is the key to the accuracy of the prediction model of heavy oil in directional wells. According to ZhangQi model、ЛиPBEPдяH model、Bastin method、Gibbs formula the viscous damping coefficient is determined in the two-dimensional prediction model, which fully consider the influence of the viscosity of the fluid by ZhangQi model、ЛиPBEPдяH model. According to the datas of12wells in Hongshanzui heavy reservoir, ZhangQi model, ЛиPBEPдяH model, is lower, Bastin method, Gibbs method is larger, and the error of variable damping coefficient in ZhangQi model is minimized.(3)Based on pumping unit geometric relations early model and accurate model are established for the polished rod motion law, and the accurate model is more suitable for the upper boundary condition of the prediction mode. The polished rod motion laws of the pumping units, such as slant hole, prefix type, diameter and regulation adjusting type pump unit, are systematically analyzed. From the results, we can find out diameter and regulation adjusting pump unit is more ground energy efficiency based on down stroke load.(4)Using Visual Basic6.0, the above theoretical method is programmed and the heavy oil directional well sucker rod pumping system simulation program is compiled. The software which is clearly in structure and easy in operation includes the database, wellbore parameter simulation, pumping unit simulation and prediction module, the output module. The software simulates the heavy oil directional well wellbore profile distribution of temperature, pressure, viscosity and sucker rod pumping system of ground indicator diagram.