Abstract

Considering the ever-increasing deterioration of the hydrocarbon reserves’ structure as well as decline of the number and, more to the point, the quality (in terms of the recoverable reserves’ amount) of new discoveries, enhanced oil recovery (EOR) methods have acquired great importance. Worthy of separate attention are gas injection EOR technologies, for they do not just increase recovery, but also improve the gas utilization factor.

The efficiency of water-alternating-gas (WAG) process depends on various factors associated with properties of reservoir rocks and fluids. Still, the wettability being responsible for phases’ distribution in the porous space and the reservoir fluid flow, is one of the most important factors. The paper analyzes the effect of wettability on increase of displacement efficiency in WAG processes.

The comparative analysis of results of core flooding experiments on long core samples in water-wet (Suzunskoye oil field) and oil-wet (North-Danilovskoye and Verkhnechonskoye oil fields) conditions is presented.

Key words:

wettability, displacement efficiency, water-wet, oil-wet, core sample, core flooding experiment

References

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Authors

V.A. Zakharenko, Tyumen Petroleum Research Center
79/1, Osipenko st., Tyumen, 625002, Russian Federation
E-mail: vazakharenko@tnnc.rosneft.ru

A.V. Kobyashev, Tyumen Petroleum Research Center
79/1, Osipenko st., Tyumen, 625002, Russian Federation
E-mail: AVKobyashev@tnnc.rosneft.ru

A.A. Pyatkov, Ph.D., Tyumen Petroleum Research Center
79/1, Osipenko st., Tyumen, 625002, Russian Federation
E-mail: aapyatkov@tnnc.rosneft.ru

K.M. Fedorov, Dr.Sc., Tyumen Petroleum Research Center
79/1, Osipenko st., Tyumen, 625002, Russian Federation
E-mail: kmfedorov@tnnc.rosneft.ru

I.A. Dolgov, JSC Verkhnechonskneftegas
3, Bolshoy Liteyny Ave., Irkutsk, 664025, Russian Federation
E-mail: iadolgov@rosneft.ru

For citation:

V.A. Zakharenko, A.V. Kobyashev, A.A. Pyatkov, K.M. Fedorov, I.A. Dolgov Jeffektivnost' vodogazovogo vozdejstvija v uslovijah gidrofil'nyh i gidrofobnyh sred po dannym laboratornyh jeksperimentov na sostavnyh kernovyh kolonkah [Efficiency of water-alternating-gas process in water-wet and oil-wet reservoirs by results of core flooding experiments on long core samples]. Neftyanaya Provintsiya, No. 4(28), Part 1, Special issue, 2021. pp. 136-154. DOI https://doi.org/10.25689/NP.2021.4.136-154 (in Russian)