Evaluation of effective parameters on CO2 injection process in a gas condensate reservoir: A case study

Abstract

ABSTRACTOne of the key problems in gas condensate reservoirs is condensate blockage phenomena or condensate banking that reduces the condensate recovery. This phenomenon occurs when by reservoir depletion the reservoir pressure declines below the dew point pressure. One of the most important and common methods to prevent condensate blockage is gas cycling. Nowadays, regarding the value of natural gas, the use of other gases such as CO2 as a suitable replacement has increased. The purpose of this study is to evaluate different parameters such as injection rate, injection pressure, and the number of wells in CO2 injection process, in order to determine optimum conditions for CO2 injection with the maximum condensate recovery and minimum economic cost. The two-parameter, Peng–Robinson equation of state (EOS) was used to match PVT experimental data. Then various scenarios of CO2 injection with different conditions have been studied, and optimum conditions for CO2 injection were compared with the natural depletion scenario. The results showed that the injection rate and pressure play important roles in determining the best condensate recovery.