Banca de DEFESA: GUSTAVO LENIN SOUZA SANTOS PACHECO

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : GUSTAVO LENIN SOUZA SANTOS PACHECO
DATE: 29/08/2023
TIME: 10:00
LOCAL: Remoto
TITLE:

A truly Multidimensional and High Order Formulation for the Numerical Simulation of Oil and Water Simulation in Heterogeneous and Anisotropic Oil Reservoirs

KEY WORDS:

Reservoir Simulation,Water-Oil Displacement, Grid Orientation Effect (GOE), Harmonic Point-Based Multipoint Flow Approximation (MPFA-H), High Order, Flux Corrected Transport (FCT).

PAGES: 57
BIG AREA: Engenharias
AREA: Engenharia Mecânica
SUMMARY:

The numerical simulation of the flow of multicomponent and multiphase fluids in oil
reservoirs is a great challenge and requires the elaboration of robust and efficient numerical
formulations. The classical two-point flow approach (TPFA) for describing diffusive flows
and the first-order Upwind (FOU) method for describing advective flows in fluid flow
considerations are widely used in reservoir simulators. In certain cases, especially with a
high rate of mobility between the injected fluid and the displaced fluid, there may be the
phenomenon of the mesh orientation effect (GOE), which consists of the strong dependence
of the numerical solution on the direction of the computational mesh. This phenomenon
is linked to the anisotropic distribution of truncation error associated with the symbolic
transport approximation. Furthermore, the standard TPFA method may not converge
to an adequate solution on non-k-orthogonal meshes. In this work, a cell-centered finite
volume formulation is proposed for the numerical simulation of water-oil displacements in
oil reservoirs using a segregated formulation on unstructured, non-k-orthogonal 2D meshes.
A Multi-Point Flow Approximation based on Harmonic Points (MPFA-H), capable of
dealing with heterogeneous flows and highly anisotropic media, is used to describe the
diffusive flows, in addition, a version of the Flux approach is proposed. 2nd order Corrected
Transport (FCT) for the description of the transport term in order to reduce artificial
numerical diffusion. In addition, a flow-oriented scheme (FOS) was used to calculate
the low-order approximations used in our modified FCT scheme. The FOS philosophy
consists of using weights that correctly capture the flow direction, making the scheme a
real multidimensional approximation to reduce the GOE. The performance of the proposed
strategy was evaluated by solving relevant reference problems in the literature, obtaining
accurate results with reduced artificial numeric diffusion and reduced GOE.

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