Research On Deep Pumping And Well-bore Visbreaking Technology In Deep Heavy Oil Wells

Based on the analysis of oil reservoir and production characteristics of Lungu oil field, it needs to carry out deep pumping and the viscosity reducing measures that's compatible with it in deep heavy oil wells. In order to predict production more precisely, the inflow performance models of single-phase and two-phase in carbonate reservoirs are set up. In view of the research status and field experience in deep heavy oil wells, using rank integrated parameters method, the sucker rod-jet pump lifting system is selected as the best choice for it's dual roles of viscosity reducing and deep pumping. By using some artificial lift theories and oil production parameters optimizing methods, the combination lifting model which choosing light oil as power fluid and the parameters optimizing procedure for deep heavy oil production are set up. According to the calculation examples, the model has been tested. Meanwhile, it finds that the amount of light oil is too much, although it can meet the requiring of oil production. In order to reduce the amount of light oil, the optimal model of the production fluid, mixture fluid and active water as the power fluid of the combination-lifting system are established. According to the comparison of all kinds of power fluid, it finds that the mixture power fluid not only can maintain the system pump efficiency at a high level, but also can drop the amount of light oil obviously. At last, calculation example of combination lifting system when the mixture fluid as power fluid and sensitivity analysis which affect the production system based on mixture fluid as power fluid are carried out. The optimal parameters are determined finally, which can provide some help to similar oil wells production.