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Open AccessReview

A Review of CO2-Enhanced Oil Recovery with a Simulated Sensitivity Analysis

Department of Civil Engineering, Deep Earth Energy Laboratory, Monash University, Building 60, Melbourne 3800, Victoria, Australia
Commonwealth Scientific and Industrial Research Organisation (CSIRO), Ian Wark Laboratory, Clayton 3168, Victoria, Australia
Author to whom correspondence should be addressed.
Academic Editor: Thomas E. Amidon
Energies 2016, 9(7), 481;
Received: 15 April 2016 / Revised: 7 June 2016 / Accepted: 9 June 2016 / Published: 23 June 2016
(This article belongs to the Collection Bioenergy and Biofuel)
PDF [2890 KB, uploaded 23 June 2016]


This paper reports on a comprehensive study of the CO2-EOR (Enhanced oil recovery) process, a detailed literature review and a numerical modelling study. According to past studies, CO2 injection can recover additional oil from reservoirs by reservoir pressure increment, oil swelling, the reduction of oil viscosity and density and the vaporization of oil hydrocarbons. Therefore, CO2-EOR can be used to enhance the two major oil recovery mechanisms in the field: miscible and immiscible oil recovery, which can be further increased by increasing the amount of CO2 injected, applying innovative flood design and well placement, improving the mobility ratio, extending miscibility, and controlling reservoir depth and temperature. A 3-D numerical model was developed using the CO2-Prophet simulator to examine the effective factors in the CO2-EOR process. According to that, in pure CO2 injection, oil production generally exhibits increasing trends with increasing CO2 injection rate and volume (in HCPV (Hydrocarbon pore volume)) and reservoir temperature. In the WAG (Water alternating gas) process, oil production generally increases with increasing CO2 and water injection rates, the total amount of flood injected in HCPV and the distance between the injection wells, and reduces with WAG flood ratio and initial reservoir pressure. Compared to other factors, the water injection rate creates the minimum influence on oil production, and the CO2 injection rate, flood volume and distance between the flood wells have almost equally important influence on oil production. View Full-Text
Keywords: CO2-EOR; miscible recovery; immiscible recovery; effective factors; review study; numerical modelling CO2-EOR; miscible recovery; immiscible recovery; effective factors; review study; numerical modelling

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Perera, M.S.A.; Gamage, R.P.; Rathnaweera, T.D.; Ranathunga, A.S.; Koay, A.; Choi, X. A Review of CO2-Enhanced Oil Recovery with a Simulated Sensitivity Analysis. Energies 2016, 9, 481.

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