Sucker Rod Pump Performance And Pump Dynamometer Card Analysis And Calculation

Sucker rod pumping is the most popular means of artificially lift in the oil fields. The performance of sucker rod pump has close relation to economic benefit of oil field. Combining with practical application, the factors that influence sucker rod pump performance are studied in this dissertation. The following contents are included:The classification, working principle and constitution of sucker rod pump are analyzed. The scope of application for every sort of pump is pointed out.Discharge coefficient is the important factor of influencing sucker rod pump performance. The discharge coefficient is calculated, and the main influencing factors are analyzed. The statistics on the measured data in a oil-field shows the submergence depth and discharge coefficient are very low, some key measures for improving discharge coefficient and sucker rod pump performance are presented; the applications of discharge coefficient to practice are illustrated with examples.Inflow performance of oil well, as a major external factor of influencing sucker rod pump performance, is studied. The model of variability of submergence depth is established based on the law of volume balance, and the changing trends of parameters like submergence depth etc are analyzed. According to the principle of supply and discharge balance, the method to predict oil yield is presented. Subject to different objective functions, the corresponding optimum combinations of suction parameters are analyzed, and the importance of choosing objective function to optimum combination of suction parameters is emphasized.Pump dynamometer card shape directly reflects the characteristics of different factors that influence the working performance of sucker rod pump performance. Using the finite difference method, the wave equation describing the dynamic change of sucker rod is solved, the pump dynamometer card is calculated Combining with practical example, the pump dynamometer card taken from that calculating method is analyzed, and the governing factors influencing working performance of sucker rod pump are pointed out, the performance and efficiency of sucker rod pump are improved by the reasonable adjustment of suction parameters. Damping coefficient is calculated respectively according to some different calculating methods.All algorithms mentioned above are programmed with MATLAB language.