Еvaluation of research results in the development of deposits with low condensate content in reservoir gas

In the process of developing oil and gas condensate fields with a low content of liquid hydrocarbon fractions, it is necessary to predict the condensate recovery factor (CRF), the onset pressure and maximum condensation of a multicomponent system. Due to their design features, domestically produced UFR and UGK units used to study thermodynamic properties have significant measurement errors. The accuracy of plotting the relationship between condensate formation and changes in reservoir conditions may be unsatisfactory, requiring further research. Existing graphical analytical methods for determining condensate recovery also lack sufficient calculation accuracy. The goal of this study is to determine gas condensate characteristics using differential condensation using a Chandler Engineering PVT unit, which has a pressure measurement range from atmospheric to 137.90 MPa and temperatures up to 204 °C. A high-resolution barascope located directly in the PVT cell allows for accurate imaging and true measurement of the precipitated liquid phase. This setup allowed for the study of hydrocarbon mixtures with low condensate content in reservoir gas. Based on the results of experimental studies, dependencies of the precipitated liquid phase on pressure changes were constructed for hydrocarbon systems with a low condensate content in the range from 3 g/m3 to 30 g/ m3 and higher. In this work, based on the research, the current CRF was determined, the pressure of the onset of condensation of a multicomponent hydrocarbon system for the deposits of the Bovanenkovo field was measured, which corresponds to the initial reservoir pressure. The maximum condensation pressure of gas condensate systems with low condensate content in reservoir gas was experimentally obtained, ranging from 0.40 MPa to 0.60 MPa. The object of thermodynamic research is gas condensate deposits, which, when developed as part of the extracted products, have low content of liquid hydrocarbon fractions.

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