Pore scale coupling of fluid displacement and unconsolidated sediment mechanics Online publication date: Sat, 25-Oct-2014
by Maša Prodanović; Jon T. Holder; Steven L. Bryant
International Journal of Oil, Gas and Coal Technology (IJOGCT), Vol. 5, No. 2/3, 2012
Abstract: In unconsolidated sediments, capillary pressure in the pore space may be large enough to move grains apart during drainage. This motion alters the pore throat sizes which control subsequent displacement in the sediment. We present two grain scale models for this coupled process. In both cases, we assume fluid interfaces are controlled by capillary forces, and determine the detailed geometry of those interfaces. We compute the net force exerted on each grain by capillary pressure, including cohesion at grain contacts supporting pendular rings. We combine those forces to determine the movement of grains using: a) a kinematic model; b) a rigorous model where mechanical stress and elastic properties of grains are included via a discrete element method. This is the first coupling in 3D, albeit in samples of limited size. Preliminary results in disordered dense sphere packs suggest the development of high permeability gas channels rather than planar structures. [Received: May 05, 2011; Accepted: October 21, 2011]
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