Changes in Oil and Water Compositions During Steam Isolation Using Gel-Forming GALKA® System in a Horizontal Well Developed by Thermogravitational Drainage
V. S. OVSYANNIKOVA, YU. V. SAVINYKH, L. K. ALTUNINA
Institute of Petroleum Chemistry, Siberian Branch of the Russian Academy of Sciences, Tomsk, Russia
Keywords: high-viscosity oils, thermogravitational drainage, heat-carrier breakthrough, gel-forming system, oil composition
Pages: 166-171
Abstract
The effect of steam isolation with GALKA® gel-forming composition in steam-assisted gravity drainage during the development of a horizontal well at the Lyael area of the Yaregskoye field on oil production and its composition was investigated. The effect of treatment was 2 - 4 t of additionally produced oil per day, with a decrease in water cut by 8 - 10 %. The effect was accompanied by an increase in oil viscosity and the proportion of heavy polar components in it, followed by a decrease to the initial values. Ammonium and hydrocarbonate ions were detected to appear in the produced water after treatment with the thermotropic composition GALKA®. An increase in the content of carbonate and chloride ions, an increase in mineralization by a factor of 2, and pH of the produced water from 7.1 to 9.7 were also detected.
DOI: 10.15372/CSD2021292
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