Improving the operating efficiency of wells with electrical submersible centrifugal pump in the fields with hard to recover reserves

摘要

The article presents the results of experimental studies of technology of plasma-pulse impacts on the surface properties of the productive formations. Upcoming trend of research to increase overhaul period of engine driven wells is proposed. Prospect and feasibility of further research on the development of innovative technological solutions of rational and cost-effective development of the fields with hard to recover reserves are noticed. It is well-known that every year the share of hard to recover oil reserves (HTR) increases. Currently, more than 60% of recoverable oil reserves are dedicated to the reservoirs of HTR. They are mainly deposits with high viscosity oil, as well as reservoirs with low-permeability. The development of such reservoirs using traditional methods (different kinds of natural reservoir condition and steady-state water flooding) is characterized by low technical and economic performance and low recovery coefficient (less than 20...30%). In terms of the depletion of actual oil reserves attention to hard to recover oil reserves increases significantly. According to the statistics in the Russian Federation there are 6,2 billion tonnes of residual reserves of heavy oil of A+B+C_1 categories. In the Northwest region about 1,5 billion tons of heavy oil is explored. Resources of natural bitumen and bitumen oil, according to various estimates vary from a few to tens billions tons. As far as the reserves with light oil are decreasing the problem of involvement of hard to recover oil reserves in active development is becoming increasingly important.