Assessment of Hydrocarbon Losses in the Reservoir Formation T1-A During the Development of the Srednetyungsky Field

Introduction. Experimental PVT studies of a multicomponent gas-condensate mixture to determine the loss of hydrocarbons in the presence of condensation water in the reservoir were carried out on recombined samples of separation gas, condensation water and saturated condensate. Materials and methods of the research. During the exploitation of an oil and gas condensate reservoir for depletion, the component composition (mixture of hydrocarbons and water vapor) of the produced gas condensate system changes, which affects the formation losses of hydrocarbons, as well as the properties of fluids and the dynamics of their phase behavior during field development. Experimental modeling of operating conditions under various thermodynamic states was carried out in order to determine the effect of condensation water on the amount of condensate recovery during development. The results of the study and their discussion. In the process of deposit formation, condensation waters are formed during geological time during the inversion of traps with gas and gas condensate deposits. In reservoirs at high pressures and temperatures, the amount of water vapor increases, which has a negative effect on the amount of formation losses of hydrocarbons. As a result of modeling on the experimental PVT installation, the influence of water vapor as a component of the hydrocarbon system on the phase behavior of condensate in the reservoir and on the value of the current reservoir losses in the reservoir was determined. Take into account that multicomponent hydrocarbon systems consist of a mixture of gas, condensate and water vapor, which signii-cantly changes the properties of the system and the dynamics of its phase state during development. Conclusions. Conducting multiple PVT - experiments determined the pressure of the beginning of condensation. From the obtained graphical dependence it can be seen that with the contact and differential research method, the beginning of condensate dropout is equal to the reservoir pressure, in the presence of water in the gas condensate system, the condensation process increases. In this case, the maximum condensation pressure is shifted towards the initial reservoir pressure. The nature of the "formation loss" curve indicates an intensification of the condensation process in the presence of condensation water in the well production. In the presence of water, condensate losses in the reservoir increased up to 5 %, respectively, the CFC value decreased.

condensation water, formation condensate losses, separation gas, formation water, contact condensation, experimental PVT studies

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