Phase Behavior and Minimum Miscibility Pressure in Nanopores
- Tadesse Weldu Teklu (Colorado School of Mines) | Najeeb Alharthy (Colorado School of Mines) | Hossein Kazemi (Colorado School of Mines) | Xiaolong Yin (Colorado School of Mines) | Ramona M. Graves (Colorado School of Mines) | Ali M. AlSumaiti (The Petroleum Institute)
- Document ID
- Society of Petroleum Engineers
- SPE Reservoir Evaluation & Engineering
- Publication Date
- August 2014
- Document Type
- Journal Paper
- 396 - 403
- 2014.Society of Petroleum Engineers
- 5.2.1 Phase Behavior and PVT Measurements, 5.2 Reservoir Fluid Dynamics
- unconventional nanopore reservoirs, critical temperature and critical pressure shift, minimum miscibility pressure, capillary pressure, phase behavior
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Numerous studies indicate that the pressure/volume/temperature (PVT) phase behavior of fluids in large pores (designated "unconfined" space) deviates from phase behavior in nanopores (designated "confined" space). The deviation in confined space has been attributed to the increase in capillary force, electrostatic interactions, van der Waals forces, and fluid structural changes. In this paper, conventional vapor/liquid equilibrium (VLE) calculations are modified to account for the capillary pressure and the critical-pressure and -temperature shifts in nanopores. The modified VLE is used to study the phase behavior of reservoir fluids in unconventional reservoirs. The multiple-mixing-cell (MMC) algorithm and the modified VLE procedure were used to determine the minimal miscibility pressure (MMP) of a synthetic oil and Bakken oil with carbon dioxide (CO2) and mixtures of CO2 and methane gas. We show that the bubblepoint pressure, gas/oil interfacial tension (IFT), and MMP are decreased with confinement (nanopores), whereas the upper dewpoint pressure increases and the lower dewpoint pressure decreases.
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