Published August 2025, Pg. 28-32

Section: Oil and gas field development and exploitation

UOT: 622:51-7

DOI: 10.37474/0365-8554/2025-08-28-32

Estimation of technological indicators taking into account mobility of condensate phase under conditions of differential reservoir depletion mode

A.A.Karimova - Baku State University

A calculation method for determining the condensate recovery coefficient in conditions of uncertainty of relative conductivity of phases taking into account the movement of the condensate phase in the depletion mode of a gas-condensate reservoir using the data of primary development and PVT properties of fluids has been developed, and on its basis, taking into account the movement of the liquid phase and in its absence, a comparative evaluation of the condensate recovery coefficient has been realized for a specific reservoir model. At the same time, the differential condensation equation of the formation depletion mode takes into account the mobility of liquid condensate and the dynamics of its production simultaneously with the gas phase, based on the condition that the gas-condensate system enters the well two-phase. The ratio of the relative phase conductivity of the condensate phase to the relative phase conductivity of the gas phase, which is included in the differential condensation equation, is defined as some function of parameters that determine the physical properties of the gas-condensate system (density, viscosity, potential amount of condensate dissolved in the gas phase, and the amount of gas phase dissolved in the condensate phase). The condition of constancy of gas-condensate factor along the current line at any moment of time in the area of wellbore and drainage contour (corresponding to quasi-stationary state of flow) is used and a new improved expression for calculation of the final condensate recovery coefficient of gas-condensate fields is obtained by increasing the accuracy of calculation of phase states of gas-condensate system adapted to thermobaric conditions. Comparative analysis of the obtained results of estimation of the condensate recovery coefficient for a specific model of the deposit (the condensate recovery coefficient is about 5 % higher at two-phase flow in comparison with single-phase flow) confirms the necessity of taking into account the mobility of the condensate phase in the flow when drawing up various design documents for gas condensate deposits.north-east part of the Mediterranean Sea and the existence of separated depressions allowed for the first time to reveal Antalia potential oil-gas bearing basin within the Mediterranean Sea.

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