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Published bySalvatore Sunderland Modified about 1 year ago

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Pore-to-Field Upscaling of Immiscible Two-Phase Flow Hasan Nooruddin Martin Blunt Jan 2015

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Outline What is upscaling? Why to scale-up multiphase flow properties? Upscaling methods – brief background How are we going to upscale multiphase flow?

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What is upscaling? Upscaling is a process to determine effective multiphase flow properties on larger scales while capturing small-scale heterogeneity. (Rhodes et al. 2008)

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Introduction Relative PermeabilityCapillary Pressure Field-scale reservoir simulation study always suffer from a shortage of SCAL data. Pore-network modelling provides a practical tool to generate large datasets of physically-consistent multiphase flow properties relatively quickly. We need to scale-up this information to a field-scale reservoir simulation gridblock. to include other heterogeneities found at larger scales. to address the impact of fluid forces acting at larger scales (e.g., impact of global boundary conditions)

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Why do we need to upscale pore-scale multiphase flow ? If it is not the REV: We need to include other heterogeneities at larger scales. Assuming REV: We need to address the impact of fluid forces acting at larger scales (e.g., impact of global boundary conditions)

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Upscaling approaches Steady-state Unsteady-state (Dynamic methods)

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Steady-state method Computationally cheaper than dynamic methods Key issue is to find the saturation distribution CL: constant capillary pressure VL: constant fractional flow CL+VL: simulate until steady-state is reached – similar to dynamic method Apply sequence of single-phase simulations Repeat the process at different average saturations

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Unsteady-state method Require running the fine-gridded model – Computationally demanding Account for numerical dispersion Case dependent – have to be reproduced for different flood rates and directions. Might generate unphysical relative permeability curves (non-monotone flux)

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Our approach mm scale cm scale m scale Facies-model scale Multistage approach starting from an accurate representation at the pore level. Pore-network model: capillary-controlled displacement – valid for most conditions at pore level. good starting point – does not depend on BC. Incorporate pore-, core-, intermediate-, and large-scale heterogeneities, as required. Including the right balance of forces at each stage. Represent physics and geology.

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Thank You Thank you

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Our approach We need to develop a simulator: Incompressible, two-phase flow simulator Includes viscous, capillary and gravitational forces Unstructured – to effectively capture heterogeneities at all upscaling stages (Rhodes et al. 2008)

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