An experimental method for predicting the composition and properties of a produced fluid under the conditions of a two-phase filtration of a gas-liquid mixture during field development for depletion

About the authors:

Sergey A. Zanochuev, Cand. Sci. (Tech.), Head of the Department of Research of Properties of Formation Fluids, Tyumen Oil Research Center; ORCID, szanochuev@mail.ru

Aleksandr B. Shabarov, Dr. Sci. (Tech.), Professor, Honored Scientist of the Russian Federation, Professor, Department of Applied and Technical Physics, School of Natural Science, University of Tyumen, Tyumen, Russia; a.b.shabarov@utmn.ru, https://orcid.org/0000-0002-5374-8704

Abstract:

During the production of oil and condensate from an oil-gas condensate field, there is an issue of correct accounting for and writing off reserves. The existing indirect methods of oil content determination in well production do not allow performing hydrodynamic calculations in real formation conditions with a high degree of certainty.
This article proposes the experimental method for predicting the composition and properties of production fluid when the liquid phase (precipitated condensate or oil) is also filtered together with the gas phase in the reservoir under thermobaric reservoir conditions.
The authors have adapted this method on the base of the real oilfield reservoir fluid as well as the model data of relative permeability. The proposed approach helped in receiving the experimental data on the changes in the current gas saturation, as well as the data on the changes in the composition and properties of the produced fluid during the field development intended for depletion. The research has established that under the conditions of two-phase filtration, the reservoir gas saturation increases while the reservoir pressure declines during the reservoir operation.
The proposed methodological approach to the study of two-phase reservoir systems can aid in developing technologies for solving the problems of separate production accounting, as well as in implementing the methods for increasing the hydrocarbon recovery.

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