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DOI: 10.5593/SGEM2016/HB14/S01.012

COMPUTATION OF MINIMUM MISCIBILITY PRESSURE FOR GAS CONDENSATE RESERVOIRS USING CHEMCAD SIMULATOR

E. Knapik, J. Stopa
Friday 11 November 2016

References: 16th International Multidisciplinary Scientific GeoConference SGEM 2016, SGEM Vienna GREEN Extended Scientific Sessions, www.sgemviennagreen.org, SGEM2016 Conference Proceedings, ISBN 978-619-7105-80-3 / ISSN 1314-2704, 2 - 5 November, 2016, Book 1 Vol. 4, 89-94pp, DOI: 10.5593/SGEM2016/HB14/S01.012

ABSTRACT

CO2 injection into the gas condensate reservoir for the enhancement of recovery is less frequently considered than for oil fields. An appropriate estimation of the minimum miscibility pressure (MMP) assures a successful miscible displacement. The aim of this work was to evaluate the effect of equations of state (EoS) on calculating minimum miscibility pressure. To describe phase equilibria several EoS were tested including Soave-Redlich-Kwong, Peng-Robinson, predictive SRK (PSRK) and Peng-Robinson-Stryjek-Vera (PRSV) equations. A LLVF flash tool in CHEMCAD, which simulates a rigorous vapor/liquid/liquid behaviour, was applied to calculate fluid miscibility. Comparison results between experimental data reported in literature for paraffin-CO2 systems and calculated values indicate that all leading EoS are accurate to predict MMP. In this work the MMP value for Zielin gas condensate reservoir in Poland was calculated. The chemical composition of reservoir fluid was identified by GC-FID method and simulated in CHEMCAD as mixtures of n-alkanes C4-C16. Relatively low MMP value (ca. 170 bar) indicate a high potential of this recovery method.

Keywords: gas condensate, minimum miscibility pressure, equation of state, CO2 injection

PAPER DOI: 10.5593/SGEM2016/HB14/S01.012, COMPUTATION OF MINIMUM MISCIBILITY PRESSURE FOR GAS CONDENSATE RESERVOIRS USING CHEMCAD SIMULATOR

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