Banca de DEFESA: TULIO DE MOURA CAVALCANTE

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : TULIO DE MOURA CAVALCANTE
DATE: 10/03/2023
TIME: 09:00
LOCAL: Pós-Graduação Engenharia Civil
TITLE:

Simulation of Immiscible Two-phase Flow in 3-D Naturally Fractured Reservoirs Using a Locally Conservative Method, a Projection-Based Embedded Discrete Fracture Model and Unstructured Tetrahedral Meshes

KEY WORDS:

Fluid flow simulation. Heterogeneous and anisotropic reservoirs. Fractured reservoirs. EDFM. pEDFM. MPFA-D. DMP

PAGES: 141
BIG AREA: Engenharias
AREA: Engenharia Civil
SUMMARY:

Fluid flow in fractured porous media is a truly relevant phenomenon, because most of the remaining oil reserves around the world reside in this type of formations, in addition to the fact that fractures are also present in less deep layers of the crust, which makes them also influential in water extraction and waste dispersion. Two-phase flow can be mathematically described by a set of nonlinear partial differential equations but modeling this type of problem represents a great challenge, due to the complexity of depositional environments, beyond the presence of the fractures. In such cases, it is particularly complex to construct structured meshes capable of adequately modeling the reservoir. In this work, a new strategy was developed to simulate the two-phase flow in three-dimensional fractured porous media whose model is discretized as a mesh of tetrahedrons. Such a strategy is based on a multi-point flux approximation that uses the so-called "diamond stencil" (MPFA-D), considering an Embedded Discrete Fractures Model (EDFM) and a projection-based EDFM (pEDFM) to include the influences of fractures in the reservoir global model. The MPFA-D is a robust and flexible formulation, capable of handling highly heterogeneous and anisotropic domains, achieving second order accuracy on the scalar variable, and at least first order accuracy for fluxes. However, as other linear MPFA methods, it does not formally guarantee monotone solutions and may return spurious oscillations in the pressure field for highly anisotropic permeability tensors or extremely distorted meshes. To handle this problem, it was developed a non-linear defect correction alternative to enforce the Discrete Maximum Principle (DMP). Besides, EDFM and pEDFM avoid the additional complexity of aligning fractures with edges or faces of the computational mesh, turning its construction more flexible. The saturation terms of the mathematical model are discretized according to the forward Euler method, in context of a fully implicit numerical scheme. In short, the present work intends to present a robust, flexible and computationally efficient tool capable of handling fractured reservoirs, using 3-D unstructured tetrahedral meshes, when simulating two-phase flows.

COMMITTEE MEMBERS:
Interno - 2749584 - IGOR FERNANDES GOMES
Externo à Instituição - MARCIO ARAB MURAD - LNCC
Externo à Instituição - MÁRCIO RODRIGO DE ARAÚJO SOUZA - UFPB
Externo à Instituição - PHILIPPE REMY BERNARD DEVLOO - UNICAMP
Presidente - 2216046 - RAMIRO BRITO WILLMERSDORF