EVALUATION OF OIL SWEEP EFFICIENCY BASED ON THE RESULTS OF LABORATORY EXPERIMENTS WITH FORMATION MODEL USING HEAT EXPOSURE AND SOLVENTS
Zakirov I.S., Zakharova E.F., Razumov A.R., Beloshapka I.E.
DOI https://doi.org/10.25689/NP.2019.2.197-209
Abstract
Due to the worldwide decline in reserves of conventional oil, there is a growing interest in natural bitumen deposits, which represent a large resource potential in Russia and in the Republic of Tatarstan in particular. At the same time, the existing technologies for their production are quite expensive, technologically complex and do not allow for achieving high values of oil recovery. Steam assisted gravity drainage (SAGD) using paired horizontal wells has become the basic technology for the development of deposits with pay zones exceeding 10 meters. Thinner stratums located in the edge zones of bituminous oil deposits of the well undergo cyclic steam treatment alternating with cycles of heated oil production and are characterized by marginal economic efficiency. Injection of a solvent margin is a promising technology to increase reserve recovery in edge zones of bituminous oil deposits with high heterogeneity of the oil-saturated reservoir. It will reduce the viscosity of bituminous oil, as well as additional washing out of the rock, increase the drainage area of wells, and will be aimed at developing reserves that are not exposed to steam. However, a preliminary fine-tuning of the new technology in laboratory conditions is needed, with the further scaling-up of the results for a real field. The closest to in-situ conditions is the penetration test which makes it possible to reduce the risks during the Pilot commercial Development. The article shows the results of laboratory penetration test evaluating the recovery factor of bituminous oil at a bulk reservoir model using heat exposure and various solvent formulas developed as part of the federal target project.
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Authors
Zakirov I.S., Dr.Sc, Pro-rector for Research, Almetyevsk State Petroleum Institute, Almetyevsk, Republic of Tatarstan, Russian Federation E-mail: zis277@yandex.ru
Zakharova E.F., PhD, Associate Professor, Almetyevsk State Petroleum Institute, Almetyevsk, Republic of Tatarstan, Russian Federation E-mail: zakharovaef@yandex.ru
Razumov A.R., Engineer, Enhanced Oil Recovery Department, TatNIPIneft Institute – PJSC TATNEFT, Bugulma, Republic of Tatarstan, Russian Federation E-mail: rar@tatnipi.ru
Beloshapka I.E., Engineer, Domanic-bitumen sector, Almetyevsk State Oil Institute, Almetyevsk, Republic of Tatarstan, Russian Federation E-mail: ivan-kursk@mail.ru
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