At present, publications devoted to modern experimental equipment are widely used in domestic and foreign scientific journals aimed at specialists in the field of hydrocarbon processing. Thus, the installation of PVT ratios from Chandler Engineering allows us to conduct research in a wide range of pressures and temperatures and determine the phase processes of hydrocarbons. In the experimental work performed with natural mixtures and reservoir gas condensate systems, a pattern was found. At high reservoir pressures and temperatures, condensates are characterized by an increased content of high molecular weight hydrocarbons of complex structure, which affects phase processes. The parameters and indicators determined on this installation are the initial ones for calculating the balance reserves of ethane, propane, butane, non-hydrocarbon components in the formation gas, designing development and field development, as well as further processing of condensate. The main goal of the work is to determine the effect of contact condensation, which manifests itself when the deposits are unevenly developed by the area of the field on the development of hydrocarbon reserves based on experimental thermodynamic studies.

One of the important tasks in forecasting and monitoring the development of oil and gas condensate fields is taking into account the current losses of condensate in the reservoir. In this case, it is necessary to use several versions of models that differ in the formation of parameters and thermodynamic properties of hydrocarbon phases. Models are considered in which either the liquid phase dissolves in the gas phase, or it is assumed that heavy fractions are absent in the gas phase. Models of this type are used more often when predicting the development of deposits in the natural depletion mode. Experimental and computational models of equilibrium phase transitions make it possible to improve the prediction of condensate losses in the reservoir. The complexity and laboriousness of the PVT experiment, along with the introduction of new technologies, create a lack of information on the thermodynamic properties of hydrocarbon systems. In order to take into account reservoir losses of hydrocarbons for the development conditions of the Vostochno-Urengoyskoye field, the forecast of the balance of condensate production for the current and final periods of operation was carried out. The model considered in the work allows for adjusting the forecast indicators of condensate production at the current moment of reservoir operation [1,2,3].