TY - JOUR
T1 - Modelling the impact of geochemical reactions on hydrocarbon phase behavior during CO2 gas injection for enhanced oil recovery
AU - Venkatraman, Ashwin
AU - Lake, Larry W.
AU - Johns, Russell T.
N1 - Funding Information:
This research was supported by a grant from Abu Dhabi National Oil Company as well as companies that participate in Gas Flooding Joint Industry Projects at the The University of Texas at Austin and Pennsylvania State University . Ashwin Venkatraman appreciates discussions with Dr. Gurpreet Singh at The Institute for Computational Engineering & Sciences at The University of Texas at Austin that led to formulating the constraint equation. Larry W. Lake holds the Sharon and Shahid Ullah Chair in the Department of Petroleum and Geosystems Engineering at The University of Texas at Austin. Russell T. Johns is the Chair of Petroleum and Natural Gas Engineering and holds the Vitor and Anna Mae Beghini Faculty Fellowship in the John and Willie Leone Department of Energy and Mineral Engineering at Pennsylvania State University.
PY - 2015/9/5
Y1 - 2015/9/5
N2 - CO2 injection in oil reservoirs offers the dual advantage of increasing oil recovery as well as storage to combat global warming. The injected CO2, however, may react with ions present in the brine as well as the rock. In this research, we present a model that quantifies the impact of these geochemical reactions on the phase behavior of hydrocarbon mixtures. A Gibbs free energy model is proposed that unifies different phase descriptions - the Peng-Robinson Equation of State (PR EOS) description for hydrocarbon phase components, the Pitzer activity coefficient model for aqueous components and an ideal solid phase. In particular, we illustrate the use of this model to determine the impact of geochemical reactions, introduced by the presence of an aqueous phase with ions and a solid calcite phase, on the phase envelope of CO2-nC14H30 mixture with different phase descriptions. The presented Gibbs free energy model is adaptable to different reservoir brines and can be used to assess the maximum impact of geochemical reactions during CO2 injection in different hydrocarbon reservoirs.
AB - CO2 injection in oil reservoirs offers the dual advantage of increasing oil recovery as well as storage to combat global warming. The injected CO2, however, may react with ions present in the brine as well as the rock. In this research, we present a model that quantifies the impact of these geochemical reactions on the phase behavior of hydrocarbon mixtures. A Gibbs free energy model is proposed that unifies different phase descriptions - the Peng-Robinson Equation of State (PR EOS) description for hydrocarbon phase components, the Pitzer activity coefficient model for aqueous components and an ideal solid phase. In particular, we illustrate the use of this model to determine the impact of geochemical reactions, introduced by the presence of an aqueous phase with ions and a solid calcite phase, on the phase envelope of CO2-nC14H30 mixture with different phase descriptions. The presented Gibbs free energy model is adaptable to different reservoir brines and can be used to assess the maximum impact of geochemical reactions during CO2 injection in different hydrocarbon reservoirs.
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U2 - 10.1016/j.fluid.2015.05.028
DO - 10.1016/j.fluid.2015.05.028
M3 - Article
AN - SCOPUS:84930663496
VL - 402
SP - 56
EP - 68
JO - Fluid Phase Equilibria
JF - Fluid Phase Equilibria
SN - 0378-3812
ER -