Enhanced recovery technology is aimed at increasing waterflood sweep efficiency and waterflood displacement efficiency. A distinctive feature of the technology is that it can be used in treating wells to limit the influx of injected and bottom water.
The reagents used in the technology have all the necessary licenses and permits
Heat-insulating water mass formed in-situ increases filtration resistance of water-bearing zones, which provides redistribution of filtration flows by area and the section of the processed area and increases waterflood sweep efficiency.
The technology is based on a series of alternating injection of reagents into injection and production wells with a water buffer volume between them. The following factors do not affect technology efficiency: reservoir temperature, viscosity and density of formation water and oil, mineralization of the formation and injected water.
The technology has been implemented in Volga-Urals and Western Siberia fields.
540,000 additional tons of oil have been recovered, the specific technological effect is 2,215 to 8,700 tons per well operation.
Effect duration: more than 24 months.
Carbon dioxide and detergents produced as a result of interaction of the alkaline reagent with oil enhance displacement efficiency. A side effect is well bottom-hole treatment.
Diagrams of geophysical research for an injection well in Samotlor field (a) and formation profile log (b) before and after treating (c) with the gel-forming composition.
Characteristics of oil displacement in an injection well test pool in Samotlor field.
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