A simulation calculation method for the lift process parameters of sucker-rod pump under different liquid supplying conditions

The methods for calculating pump intake pressure and piston stress were determined respectively based on the differences of liquid supply capacity in the lift process of sucker-rod pump. After the static model was established, the method for calculating the damping factor in the process of well lift was modified according to the sucker-rod wave theory, and the dynamic model of the lift of sucker-rod pump was established. the numerical distribution of pressure and sucker rod string stress in the vertical space of well under different liquid supplying conditions was calculated under the constraint of surface dynamometer card, the pump intake pressure, dynamic liquid level, formation flow pressure and other parameters were simulation calculated, and the method for the continuous simulation calculation of the lift process parameters of sucker-rod pump under different liquid supplying conditions was established. The research results show that this method can meet the required calculation accuracy of dynamic liquid level in oil wells under the working conditions with insufficient liquid supply and provide theoretical basis for the analysis and working system optimization and adjustment of well lift.