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DETERMINING OPTIMUM COMPOSITION OF AGENTS AND ESTIMATION OF RESERVOIR PERFORMANCE

Irina Guskova, Vadim Sayakhov

Abstract

Oil production decline in Russia can be explained by deterioration of its oil reserves. That is why the country pays much attention to development issues of high-viscosity oil fields of the Middle and Lower Carboniferous sediments. In this regard, using new chemical agents with combined effects and study of their impact mechanism has become of scientific and practical significance. This paper presents a laboratory physical simulation experiment to study reservoir performance after steam and chemical agent injection. For that purpose a chamber and a steam generator, a laboratory autoclave reactor (Parr Instruments model 4571), were used to program heating and provide a continuous flow of steam. For physical simulation of oil recovery, experimental mixture of sand and heavy oil from Ashalchi oil field with 0.955 g/cm3 density and 10 wt% oil content was prepared. Athylacetate has been chosen to take into consideration because it meets property requirements, such as complete solubility in water, compatibility with the produced oil, its viscosity reduction, relatively low cost and environmental safety. The authors studied the influence of dosed chemicals quantity and their introduction sequence (before and during steam injection procedure) on oil recovery rate, residual oil amount and asphaltene content in it. The chemical used in the research work was ethylacetate. The results of the experiments allowed to draw the following conclusion: injection of 20 wt% ethylacetate, or acetylacetone, as a slug prior to steam injection will have a positive effect to improve hydrodynamic connection of injection and production wells in steam assisted gravity drainage process. Moreover, agents based on polar organic compounds are suitable to replace compositions containing acids, surfactants, solvents and water because they are soluble in water, compatible with the oil produced, environmentally safe and relatively cost-effective for production of viscous oil on the territory of the Russian Federation.

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DOI resolver: doi.org/10.5593/sgem2017/14/s06.075

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