Optimization of parameters influencing the nonequilibrium process of extraction of hard-to-recover oils in a gas-liquid environment

Abstract

In this work, the problem and methods of residual oil extraction, analysis and interpretation of oil-technological and physical-chemical data aimed at increasing the degree of oil extraction from depleted oil reservoirs in the fields of Azerbaijan were studied. The developed effective aqueous solution of surfactants together with air was pumped through an ejector into producing oil wells. The proposed system of oil reservoir processing and methods of intensifying the inflow of a solution of surface-active substances with air through an ejector increase the degree of oil extraction. They significantly improve not only the optimal modes of oil production, but also stabilize the development system, which has a positive effect on the final oil recovery. The developed surfactant solution and ejector allow for improved treatment of oil reservoirs and increased efficiency of oil extraction. The designations of the elements and the diagram of the developed ejector for feeding a surfactant solution with air into an oil well are given. The studies show that the highest oil recovery factor (>= 50%) is possible in formations with an oil viscosity of 0.5-1.5 mPa s. At higher oil viscosity values, the efficiency of the solution injection method for extracting residual oil is low. The experiments were carried out at production wells No. 1580, 1858, 1715 and injection well No. 1544 "Siyazaneft" of PO "Azneft". The results of the experiments conducted in the fields of Azerbaijan showed that the ejector we developed and used allows us to increase the efficiency of extracting residual viscous oil from depleted formations.