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Abstract

Summary

The prediction of water breakthrough and oil recovery for naturally fractured reservoirs (NFRs) cannot be performed accurately without dynamic upscaled relative permeability functions. Relative permeability is commonly assumed to be a scalar quantity, although a justification for NFRs has yet to be presented. In this study, we show how accurate this assumption is for fracture-matrix ensemble relative permeabilities determined by numeric simulations of unsteady-state core flooding.

Numerical determination of relative permeability requires a realistic flow model, a spatially adaptive simulation approach and a sophisticated analysis procedure. To fulfil these requirements, we apply discrete fracture and matrix modelling to well characterised hm-km outcrop analogues. These are parametrized with aperture, permeability, and capillary pressure data. Fracture attributes are allowed to vary from segment to segment, trying to emulate in situ conditions. The finite-element-centered-finite-volume method is used to simulate two-phase flow in the fractured rock, considering different wettability conditions.

Our results indicate that the ensemble relative permeability of 2D digital NFR outcrop analog models is a tensor property. The tensors are not necessarily symmetric, and their eigenvalues are not always equal to the diagonal terms. Also, the off-diagonal terms can determine the type, i.e., counter vs co-current imbibition, and the direction of imbibition.

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/content/papers/10.3997/2214-4609.201800044
2018-02-05
2024-04-24

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References

  1. Saidi, A.M.
    , Fracture Reservoir Engineering, 1987, Total Edition Press.
     [Google Scholar]
  2. Wu, K., et al.
    , An efficient Markov chain model for the simulation of heterogeneous soil structure. Soil Science Society of America Journal, 2004. 68(2): p. 346–351.
     [Google Scholar]
  3. Durlofsky, L.J.
    Upscaling and gridding of fine scale geological models for flow simulation. in 8th International Forum on Reservoir Simulation Iles Borromees, Stresa, Italy. 2005.
     [Google Scholar]
  4. Gallouët, T. and D.Guérillot
    . An optimal method for averaging the absolute permeability. in Proc. of the 3rd Internat. Reservoir Characterization Technical Conf.1991.
     [Google Scholar]
  5. Durfolsky, L.
    Numerical calculation of equivalent grid block permeability tensors of heterogeneous porous media: Water Resour Res V27, N5, May 1991, P299–708. in International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts. 1991. Pergamon.
     [Google Scholar]
  6. Hassanpour, R., et al.
    , Calculation of permeability tensors for unstructured gridblocks. Journal of Canadian Petroleum Technology, 2010. 49(10): p. 65–74.
     [Google Scholar]
  7. King, M.J.
    Application and analysis of tensor permeability to crossbedded reservoirs. in SPE Western Regional Meeting. 1993. Society of Petroleum Engineers.
     [Google Scholar]
  8. Bear, J.
    , Dynamics of fluid flow in porous media. Amer. Elsevier Publ. Co., NY, 1972.
     [Google Scholar]
  9. Pickup, G.E. and K.S.Sorbie
    , The scaleup of two-phase flow in porous media using phase permeability tensors. SPE journal, 1996. 1(04): p. 369–382.
     [Google Scholar]
  10. Lohne, A., G.A.Virnovsky, and L.J.Durlofsky
    , Two-stage upscaling of two-phase flow: from core to simulation scale. SPE journal, 2006. 11(03): p. 304–316.
     [Google Scholar]
  11. Keilegavlen, et al.
    , Tensor relative permeabilities: origins, modeling, and numerical discretization. International journal of numerical analysis and modeling, 2012. 9(3): p. 701–724.
     [Google Scholar]
  12. Muskat, M. and R.D.Wyckoff
    , Flow of homogeneous fluids through porous media. 1937.
     [Google Scholar]
  13. Barton, N., S.Bandis, and K.Bakhtar
    . Strength, deformation and conductivity coupling of rock joints. in International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts. 1985.
     [Google Scholar]
  14. Kranzz, R., et al.
    The permeability of whole and jointed Barre granite. in International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts. 1979.
     [Google Scholar]
http://instance.metastore.ingenta.com/content/papers/10.3997/2214-4609.201800044
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Tensorial Fracture-Matrix Ensemble Relative Permeabilities in Naturally Fractured Reservoirs: Evidence from Discrete Fracture and Matrix Simulations
Conference Proceedings 2018, 1 (2018); https://doi.org/10.3997/2214-4609.201800044
/content/papers/10.3997/2214-4609.201800044
/content/papers/10.3997/2214-4609.201800044
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