Abstract

The involvement of development of natural bitumen reserves is becoming more relevant for oil-producing companies due to the depletion of hydrocarbon reserves in conventional fields. Along with the thermal methods, the use of combined methods with sequential injection of steam and solvent, increasing the degree of oil recovery, is promising for extra-viscous oil fields. Conducting filtration research on reservoir models makes it possible to apply the results of laboratory experiments and optimize the use of such development technology in real oil fields and reduce risks during pilot works. This paper presents the results of a comparative analysis of the component composition of bituminous oil, which was extracted from the sand-packed reservoir model using thermal and chemical impact methods. Gas-liquid chromatography (GLC) is considered one of the main methods for compositional analysis of oil. This method is based on the separation of hydrocarbon mixtures in chromatographic columns under dynamic conditions. The GLC method has high accuracy and separating ability to perform qualitative and quantitative compositional analysis of the test sample. Filtration research was performed according to the methodology using the PIKOFP/EP-K-T Geologic unit, which was developed with the Russian state support, on a reservoir model consisting of natural bitumen-saturated core from the Ashalchinskoye field and quartz sand saturated with bituminous oil from the Ashalchinskoye field. The use of quartz sand in physical modeling made it possible to ensure the comparability of experiments and to avoid the influence of geological heterogeneity of core material on the results. The composition of bituminous oil displaced after the application of steam and solvent was studied on a gas-liquid chromatograph in the range of programmable temperatures of 20-350°C using the method of internal normalization. The results of chromatographic research of bituminous oil revealed that the combined use of thermal and chemical methods contributes to a more efficient displacement of bituminous oil from the sand packed reservoir model and an increase in the development of heavy hydrocarbon fractions.

Key words:

bituminous oil, hydrocarbon composition, chromatography, reservoir model, oil displacement, steam injection, chemical injection.

References

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Authors

I.S. Zakirov, Doctor of technical sciences, vice-rector for scientific work, Almetyevsk State Oil Institute
2, Lenin st., Almetyevsk, 423450, Russian Federation
E-mail: zis277@yandex.ru

E.F. Zakharova, Ph.D., associate professor of the department "Development and explotation of oil and gas fields", Almetyevsk State Oil Institute
2, Lenin st., Almetyevsk, 423450, Russian Federation
E-mail: zakharovaef@yandex.ru

V.A. Sayakhov, senior lecturer of the department "Development and explotation of oil and gas fields", Almetyevsk State Oil Institute
2, Lenin st., Almetyevsk, 423450, Russian Federation
E-mail: sayakhoff@mail.ru

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