Impact of fluid characterization on compositional gradient in a volatile oil reservoir

摘要

Compositional gradient known as a potential of vertically variations in composition (and sometimes areal changes) has a remarkable effect on reservoir management steps such as estimation of initial hydrocarbon in place, design of downstream equipments and prediction of gas-oil contact. One of the main steps in development of compositional grading is to characterize fluid sample. In this study, compositional grading is studied in a volatile oil sample from an oil field in south of Iran. Implemented models are based on isothermal and non-isothermal, i.e., zero diffusion, Hasse and Kempers models. Results illustrated that isothermal and zero diffusion models are in appropriate consistency with field data. Then, effect of C_(10+) splitting on compositional grading was studied. It was shown that splitting of C_(10+) to more pseudo-components does not have significant effect on variation in composition of hydrocarbon and non-hydrocarbon components.