Temperature and Composition Effect on CO<sub>2</sub> Miscibility by Interfacial Tension Measurement
- Publication date
- Publisher
Abstract
Crude
oil reservoirs have different temperatures, compositions, and pressures,
therefore oil recovery performance by CO<sub>2</sub> injection varies
from one case to another. Furthermore, it is predicted that lower
interfacial tension between injected CO<sub>2</sub> and reservoir
fluid results in more oil recovery. In this study, we investigate
the effect of temperature on the equilibrium interfacial tension between
CO<sub>2</sub> and three different oil fluids at different pressures.
Also minimum miscible pressure (MMP) is measured by the vanishing
interfacial tension (VIT) technique to determine the temperature effect
on the CO<sub>2</sub> miscible gas injection. The results on different
pure and mixtures of hydrocarbon fluids show that for pressures up
to 5.2 MPa, the higher the temperature was, the lower was the interfacial
tension (IFT) measured. However, for the cases with pressure higher
than 5.2 MPa, as the temperature was increased, the IFT increased
too. In addition the VIT technique is used to measure the MMP of CO<sub>2</sub> and pure paraffin; the heavier paraffin was, the higher was
the MMP noticed. Also, we have learned that paraffin groups have an
important effect on multicomponent interfacial tension behavior