Displacement Mechanisms Of 3-D's Pore Network And Software Design Of Micro-flow Simulation

This research focuses on porous medium. A porous medium is modeled with a similar structure in three dimensions, the porous medium may be represented as a network of narrow chambers ( called throats ) that intersect at larger void spaces (called pores ). Using percolation theory to describe micro-flow mechanism, we have developed quasi-static models to simulate single-phase flow ,two-phase primary drainage and secondary imbibition in disordered networks. In particular. These models calculate capillary pressures, relative permeabilities, saturation paths, flow regimes, and spatial clusters of the different fluids in the network.Microscope parameters of pore networks, i.e., volumes, areas, lengths, inscribed circle radii and shape factors is very important for constructing the quasi-static models. We analysis the distribution of these parameters, goodness of fit to a theoretical probability distribution, the probability distribution functions: normal, lognormal, gamma, and weibull.There are two basic models of multiphase flow in pore networks: dynamic and quasi-static. In dynamic models, capillary, gravity, and viscous forces in the fluids are accounted for simultaneously,. In quasi-static models, capillary forces dominate, gravity modifies the magnitude of capillary pressure, and the microscopic fluid distributions are frozen at each level of the capillary pressure. In this study we adopt the quasi-static approach and ignore the effects of viscous forces. The pore-level displacement mechanisms: piston-type, snap-off, cooperative pore-body filling are considered with arbitrary receding and advancing contact angles. We describe the physics of two-phase flow in a single pore, i.e., the capillary entry pressure in piston-type displacement, snap-off and cooperative pore-body filling.Using pore network modeling, we analysis the effects of microscope parameters on water drive reservoir. Results show coordinate number and shape factor increasing, residual oil saturation decreasing. Water displacement recovery of model with large inscribed circle radii is improved.