Technical Paper: Practical and Robust Isenthalpic/Isothermal Flashes for Thermal Fluids

Society: SPE
Paper Number: 118893
Presentation Date: 2009
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This paper describes in detail the computational techniques and formulations for constructing a phase envelope and subsequent isenthalpic/isothermal flash calculations that are practical for multiphase fluids in a nonisothermal environment.

These methods were designed especially for heavy oil applications and use in numerical simulators. They are based on a fluid characterized by pressure- and temperature-dependent permeability values. Although the procedures may be extended to more general N-phase systems, the paper gives full details for a three-phase oil-gas-water system. Any number of hydrocarbon components may be present and water may exist as a liquid or a vapor, or both. The presence of nonvolatile or noncondensable hydrocarbon components is considered.

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