Miscible CO 2 Flooding for EOR in the Presence of Natural Gas Components in Displacing and Displaced Fluids

Aly A Hamouda and Sidra Chughtai
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Aly A Hamouda: Department of Energy and Petroleum Engineering, University of Stavanger, 4036 Stavanger, Norway
Sidra Chughtai: Department of Energy and Petroleum Engineering, University of Stavanger, 4036 Stavanger, Norway

Energies, 2018, vol. 11, issue 2, 1-12

Abstract: Carbon dioxide (CO 2 ) 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 CO 2 and CO 2 /C1/C3 (CO 2 /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 CO 2 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 CO 2 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 CO 2 at miscible conditions increased the oil recovery for crude oil compared to flooding only with CO 2 . Transverse dispersion of CO 2 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.

Keywords: CO 2 flooding; enhanced oil recovery (EOR); effect of light components; sandstone; supercritical CO 2; water extraction by Super critical CO 2 (ScCO 2 ) (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2018
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