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New Methodology for the Modeling of Compositional Grading within the Gas-oil Transition Zone in Petroleum Reservoirs

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A general theory and a method are developed to model compositional grading and fluid saturation change within the gas-oil transition zone using a non-isothermal model for compositional grading that accounts for the modifying effect of capillary pressure on phase equilibrium (gas and oil pressures are not the same at a point). At each depth, compositional grading calculations will result in the prediction of capillary pressure, and then concept of Leverett's J-function will be used to calculate phase saturation.
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Keywords: Leverett's J-function; capillary pressure; compositional grading; equation of state; plus fraction

Document Type: Research Article

Affiliations: 1: Tehran Faculty of Petroleum Engineering,Petroleum University of Technology, Tehran, Iran 2: University of Calgary, Calgary,Alberta, Canada

Publication date: March 1, 2013

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