A Rigorous Solution to the Problem of Phase Behavior in Unconventional Formations With High Capillary Pressure
- Sajjad S. Neshat (University of Texas at Austin) | Ryosuke Okuno (University of Texas at Austin) | Gary A. Pope (University of Texas at Austin)
- Document ID
- Society of Petroleum Engineers
- SPE Journal
- Publication Date
- August 2018
- Document Type
- Journal Paper
- 1,438 - 1,451
- 2018.Society of Petroleum Engineers
- Connate water, pore size distribution, Unconventional, Three-phase capillary pressure, Capillary Equilibrium
- 1 in the last 30 days
- 226 since 2007
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Phase behavior of hydrocarbon mixtures is affected by the petrophysical properties of the formation. This paper integrates several important thermodynamic and petrophysical aspects of the problem in a rigorous way and introduces a solution that can be applied over the range of pore sizes in tight and shale formations in which hydrocarbons can be practically recovered. A new criterion for phase-stability analysis is introduced that results in discovery of a new range of solutions for the capillary equilibrium problem. A novel three-phase capillary pressure model has been used to estimate the effect of connate water on the gas/oil capillary pressure. The model is then used in conjunction with the new stability method to solve several phase-behavior problems for binary and multicomponent reservoir fluids. We show that the new approach can significantly improve the estimation of phase behavior at high capillary pressure.
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