Prediction of waterflood performance in mixed-wet systems from pore-scale modelling and simulation

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Abstract

    The wettability characteristics of a porous medium play a major role in a diverse range of measurements including; capillary pressure data, relative permeability curves, electrical conductivity, waterflood recovery efficiency and residual oil saturation. This study describes the development and implementation of a pore-scale simulator capable of modelling multiphase flow in porous media of nonuniform wettability. By explicitly incorporating pore wettability effects into a steady-state model, it has been possible to explain many experimental observations from a microscopic standpoint. Results are presented which show how a (the fraction of pores which are assigned oil-wet characteristics) affects resulting capillary pressure and relative permeability curves. Simulated capillary pressure data demonstrate that some standard wettability tests (such as Amott-Harvey and free imbibition) may give spurious results when the sample is fractionally-wet in nature. The corresponding relative permeability curves have been used to calculate waterflood displacement efficiencies for a range of wettability conditions, and recovery is shown to be maximum when the oil-wet pore fraction approaches 0.5. Furthermore, a novel test is proposed which could be used to determine the wettability of both fractionally-wet and mixed-wet porous media. To date, no such satisfactory test exists.

    Original languageEnglish
    Title of host publicationProceedings of the SPE Symposium on Reservoir Simulation
    Pages445-457
    Number of pages13
    Publication statusPublished - 1993
    EventSPE Reservoir Simulation Symposium 1993 - New Orleans, LA, USA, United States
    Duration: 28 Feb 19933 Mar 1993

    Conference

    ConferenceSPE Reservoir Simulation Symposium 1993
    CountryUnited States
    CityNew Orleans, LA, USA
    Period28/02/933/03/93

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