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

Author

Listed:
  • 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)

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.

Suggested Citation

  • Aly A Hamouda & Sidra Chughtai, 2018. "Miscible CO 2 Flooding for EOR in the Presence of Natural Gas Components in Displacing and Displaced Fluids," Energies, MDPI, vol. 11(2), pages 1-12, February.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:2:p:391-:d:130863
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