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Energies 2018, 11(2), 391; https://doi.org/10.3390/en11020391

Miscible CO2 Flooding for EOR in the Presence of Natural Gas Components in Displacing and Displaced Fluids

Department of Energy and Petroleum Engineering, University of Stavanger, 4036 Stavanger, Norway
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Received: 1 December 2017 / Revised: 4 February 2018 / Accepted: 5 February 2018 / Published: 8 February 2018
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Abstract

Carbon dioxide (CO2) flooding is a complicated process as it involves phase behavior. The objective of this work was to understand the mass transfer mechanisms during flooding with CO2 and CO2/C1/C3 (CO2/HC) based on experimental and simulated composition changes. Three model oil compositions were used (n-C10, n-C10/C1, and n-C10/C1/C3). For a comparison, crude oil from a North Sea field was included. The second part of the investigation was to compare the effect of the combined light components (C1/C3) with CO2 as a displacing fluid on enhanced oil recovery (EOR). Equation of State EOS SRK–Peneloux was used for the simulations to predict composition changes. The highest recovery was obtained from model oil (n-C10) displaced with CO2 compared to model oil containing light components with the highest recovery recorded from model oil/C1 (live oil A) compared to model oil/C1/C3 at all of the tested temperatures. The presence of light components (C1/C3) in the injected CO2 at miscible conditions increased the oil recovery for crude oil compared to flooding only with CO2. Transverse dispersion of CO2 helps in eliminating/reducing the effect of viscous instabilities by shortening fingering travel/widening the fingers. The collected samples contained water, although the flooding was done on dry sandstone cores. Possible mechanisms are discussed in a later section. View Full-Text
Keywords: CO2 flooding; enhanced oil recovery (EOR); effect of light components; sandstone; supercritical CO2; water extraction by Super critical CO2 (ScCO2) CO2 flooding; enhanced oil recovery (EOR); effect of light components; sandstone; supercritical CO2; water extraction by Super critical CO2 (ScCO2)
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Hamouda, A.A.; Chughtai, S. Miscible CO2 Flooding for EOR in the Presence of Natural Gas Components in Displacing and Displaced Fluids. Energies 2018, 11, 391.

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