Prediction of nitrogen diluted CO 2 minimum miscibility pressure for EOR and storage in depleted oil reservoirs

摘要: Abstract Injection of CO2 into depleted oil reservoirs can result in incremental recovery to help offset the cost storage. This paper presents a thorough study effects nitrogen on minimum miscibility pressure (MMP) for storage reservoirs. Nitrogen diluted MMPs 55 model samples were calculated using Peng–Robinson Equation State (PR EOS) temperature range 305–360 K. Based modeling results, an analytical equation has been developed predicting ratio impure MMP pure MMP, Fimp. In this equation, Fimp is expressed as function pseudo-critical CO2, critical pressures and N2, reservoir temperature. For with molecular weights lower than certain value (Mmin) at various temperatures, chart created supplying coefficient equation. Compared commonly used correlations literature, new correlation yields more accurate match data found literature.