TITLE:
Phase Behavior of a United Arab Emirates Stock-Tank Oil and Carbon Dioxide at Reservoir Conditions: Experiments and Thermodynamic Modeling
AUTHORS:
Samir I. Abu-Eishah, Rashid S. Mohammad
KEYWORDS:
Crude Oil, Live Oil, Recombined Oil, Swelling Factor, CO2 Injection, Enhanced Oil Recovery
JOURNAL NAME:
Open Journal of Yangtze Oil and Gas,
Vol.1 No.1,
April
20,
2016
ABSTRACT: Injection of a
soluble gas like CO2 into an oil reservoir reduces the interfacial
tension and oil viscosity and contributes to oil swelling, which together, in
turn, enhance the oil mobility and relative permeability. In this work an experimental phase
equilibrium setup for the recombination of live oil (stock-tank oil and first-stage
separator gas) and measurement of the corresponding phase behaviors of CO2/live
oil mixtures is described. In the recombination process, the vapor-to-oil molar
ratio was adjusted until the composition of the original reservoir fluid was obtained.
The average of the absolute error (AAE) in composition was about 0.77% and 1.09%
for the two reservoir fluids under test (named here wells A#22 and A#33,
respectively). The optimum vapor-to-oil molar ratio for zero deviation in the
methane composition in the live oil (recombined) was about 0.42 for both wells.
In addition, the PVTi simulator was used to reproduce the live oil (by
combining the first-stage separator gas and the stock-tank oil) and also to
predict the recombined oil characteristics at the reservoirs’ saturation
pressure and bottom hole temperature. On the other hand, the PVTpro simulator
was used to investigate the oil swelling rate and establish the relationship
between saturation pressure and the injected CO2 mass fraction. The
average of the absolute relative error (AARE) between experimental and
predicted saturation pressures was 7.78% for well A#22 and 5.38% for well A#33.