Permeability Evolution of Porous Sandstone in the Initial Period of Oil Production: Comparison of Well Test and Coreflooding Data

Mikhail S. Turbakov, Evgenii V. Kozhevnikov (), Evgenii P. Riabokon, Evgeniy A. Gladkikh, Vladimir V. Poplygin, Mikhail A. Guzev and Hongwen Jing
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Mikhail S. Turbakov: Department of Oil and Gas Technologies, Perm National Research Polytechnic University, 614990 Perm, Russia
Evgenii V. Kozhevnikov: Department of Oil and Gas Technologies, Perm National Research Polytechnic University, 614990 Perm, Russia
Evgenii P. Riabokon: Department of Oil and Gas Technologies, Perm National Research Polytechnic University, 614990 Perm, Russia
Evgeniy A. Gladkikh: Department of Oil and Gas Technologies, Perm National Research Polytechnic University, 614990 Perm, Russia
Vladimir V. Poplygin: Department of Oil and Gas Technologies, Perm National Research Polytechnic University, 614990 Perm, Russia
Mikhail A. Guzev: Institute of Applied Mathematics, Far Eastern Branch of the Russian Academy of Sciences, 690950 Vladivostok, Russia
Hongwen Jing: State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou 221116, China

Energies, 2022, vol. 15, issue 17, 1-13

Abstract: Permeability prediction in hydrocarbon production is an important task. The decrease in permeability due to depletion leads to an increase in the time of oil or gas production. Permeability models usually are obtained by various methods, including coreflooding and the field testing of wells. The results of previous studies have shown that permeability has a power-law or exponential dependence on effective pressure; however, the difficulty in predicting permeability is associated with hysteresis, the causes of which remain not fully understood. To model permeability, as well as explain the causes of hysteresis, some authors have used mechanical reservoir models. Studies have shown that these models cannot be applied with small fluctuations in effective pressures in the initial period of hydrocarbon production. In this work, based on the analysis of well test data, we came to the conclusion that in the initial period of production under constant thermobaric conditions, the permeability of a slightly clayey terrigenous reservoir depends on the amount of fluid produced. A model has been obtained that describes the change in permeability in the initial period of oil production. Core samples were flooded to confirm the model. Coreflooding showed high convergence of the model obtained from well test data. With computed tomography (CT) and scanning electron microscope (SEM), the properties and structure of the core were studied, and it was found that the main reason for the decrease in the permeability of slightly clayey rocks in the initial period of production is the migration of natural colloids.

Keywords: permeability; permeability hysteresis; colloid migration; coreflooding; porous media (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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