Effect of Effective Pressure on the Permeability of Rocks Based on Well Testing Results

Evgenii Vasilevich Kozhevnikov, Mikhail Sergeevich Turbakov, Evgenii Pavlovich Riabokon and Vladimir Valerevich Poplygin
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Evgenii Vasilevich Kozhevnikov: Department of Oil and Gas Technologies, Perm National Research Polytechnic University, Perm 614990, Russia
Mikhail Sergeevich Turbakov: Department of Oil and Gas Technologies, Perm National Research Polytechnic University, Perm 614990, Russia
Evgenii Pavlovich Riabokon: Department of Oil and Gas Technologies, Perm National Research Polytechnic University, Perm 614990, Russia
Vladimir Valerevich Poplygin: Department of Oil and Gas Technologies, Perm National Research Polytechnic University, Perm 614990, Russia

Energies, 2021, vol. 14, issue 8, 1-20

Abstract: During the development of oil and gas fields, the permeability of the reservoirs decreases due to a decrease in reservoir pressure and an increase in effective pressure, as a result of which significant reserves of oil and gas remain in the reservoir. To predict the rate of decrease in oil production rates during field development and to respond quickly, it is necessary to know the law of permeability decrease with an increase in effective pressure. Existing methods for describing the change in the permeability of rocks were analyzed in the paper. Numerical analysis of the results of core studies from previously published papers and the results of field well testing on the examples of the north Perm region oil fields showed that in both cases, regardless of the type of rock and the type of reservoir, the change in permeability can be described by the same equations (exponential and power-law). Obtained equations can be used to predict changes in the permeability of terrigenous reservoirs of the north Perm region oil fields. At the same time, according to the results of well testing, an intensive decrease in permeability is observed with an increase in effective pressure. Analysis of the nature of permeability changes using the Two-Part Hooke’s Model showed that significant irreversible deformations are currently taking place in the formations of the oil fields under consideration. Predicting the change in permeability from effective pressure can allow to optimize the development of oil deposits.

Keywords: permeability; effective pressure law; well testing (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: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (4)

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