PVT-Data, Well Treatment, and Prepartion of Input Data for an Isothermal Gas-Water-Foam Version of MULKOM.

摘要

MULKOM is a multi-dimensional numerical model for simulating the coupled mass and heat transport of multiphase fluids in permeable media. Originally developed for geothermal reservoir simulation, MULKOM features a modular architecture which facilitates applications to a variety of flow systems of interest in subsurface resource recovery storage. The notes assembled in this report are intended to assist in applications of a particular version of MULKOM adapted for isothermal flow of gas-water-foam mixtures. Not all of these three phases need be present; for example, systems containing only gas and water may be simulated by setting foam saturation (volume fraction of foam) to a very small value. It is emphasized that the version of MULKOM described here is under continuing development; the chief shortcoming at the present time being the treatment of foam as an indestructible phase rather than as an emulsion of gas surfactant solution with texture changing in response to flow. The section on PVT treatment highlights the correlations used to calculate thermophysical properties of the foam and gas phases, and gives detailed specifications of the relative permeability treatment used. This section on well treatment describes the formulation for production and injection wells with multi-layer completions operating under combined rate and pressure constraints. Subsequently, a detailed description of input formats for specifying simulation problems is given. The appendices include statements of the governing equations for multiphase flow solved by the MULKOM simulator in continuum as well as in discretized form. 18 refs., 2 figs., 1 tab.