Abstract
AbstractCondensation of petroleum retrograde gas and especially that around a wellbore can decrease the deliverability of the well significantly. Better estimation of the point of phase transition is the key for reservoir engineers to devise management strategies to reduce condensate dropout and improve production and ultimate recovery. It has been established theoretically that the point of phase transition obtained from bulk PVT experiments does not represent the phase behavior of hydrocarbon fluids confined in nano-pores. However, very few experimental data are available. In this study, we measured the impact of nano-confinement on the phase behavior of propane using nano-fluidic devices. Direct observations of phase changes show that nano-confinement led to reductions in the vapor pressure that are consistent with the theory of capillary condensation. The shifts in the vapor pressure, however, were not always in good agreement with the Kelvin equation.
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