Abstract
At present high-viscosity oils are considered as the main reserve of world oil production. High-viscosity oil pools are usually developed using thermal treatment. To increase efficiency of thermal-steam treatments of high-viscosity oil pools we proposed to combine them with physicochemical methods using gel-forming systems to increase reservoir coverage by steam injection. The results of laboratory research and pilot tests of IOR gel-technologies for high-viscosity oil pools developed by thermal-steam and cyclic-steam treatments are presented. To optimize gel-technologies involving thermotropic inorganic gel-forming GALKA-Ñ solutions based on aluminum salt – carbamide – water system we investigated rheological properties, effects of the amounts of systems and steam slugs, sequence of their injections on efficiency of thermal-steam treatment. Pilot tests carried out in Permocarbonic deposit of Usinskoye oilfield proved the efficiency of gel-technologies, their availability for IOR from high-viscosity oil pools at thermal-steam and cyclic-steam treatments. Thermotropic inorganic gels increase reservoir coverage by steam injection, decrease water cuttings of well production by 3-45%, increase oil production rate by 11-33% and decrease liquid flow rate by 14-25%. Gel-technologies are environmentally safe and economically effective.
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