Banca de DEFESA: RAQUEL OLIVEIRA LIMA

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STUDENT : RAQUEL OLIVEIRA LIMA
DATE: 31/01/2024
TIME: 14:00
LOCAL: Pós-Graduação Engenharia Civil
TITLE:

Evaluation of Parameters that Impact Flow Simulations Partially Coupled to Geomechanics: Study of a Brazilian Siliciclastic Reservoir 

KEY WORDS:

reservoir geomechanics, coupled simulation, two-way partial coupling, pseudo coupling, principal component analysis, non-coincident meshes.

PAGES: 142
BIG AREA: Engenharias
AREA: Engenharia Civil
SUMMARY:

This work uses flow simulation coupled with geomechanics to quantify rock deformation due to production in oil reservoirs. The module for coupled simulations uses the commercial software Imex® as a flow simulator and a finite element mechanical simulator in Matlab®, employing one-way, two-way partial coupling and pseudo-coupling schemes. The flow and mechanical problems are coupled by changing pressure, pore compressibility, absolute permeability, and porosity. The simulations were conducted for Campo de Namorado (Campos Basin, Brazil) to evaluate aspects that impact the partial coupling procedure, such as mesh refinement, coupling frequency and variables, and rock and fluid properties. The objective is to evaluate the influence of the reservoir's mechanical behavior on production predictions and how to reduce the computational cost of coupled simulations. Simulations using non-coincident meshes for flow and mechanical problems showed that reducing the refinement of the mechanical mesh only in the vertical direction presented results very close to those when the meshes are coincident, with significant reduction in computational cost. In the two-way coupled simulations, pore compressibility was the coupling parameter that demonstrated the most significant influence on the pressure variation of the reservoir under study. The choice of coupling formulation is very important for production forecast. It was observed that a high coupling frequency might not result in significant differences in production predictions and displacements, and this coupling frequency should be defined dynamically depending on the variation of some of the coupling parameters to reduce the computational cost. Coupled simulationspredicted greater oil recovery than the flow simulation. The pseudocoupling scheme, in which the multiplier tables were generated through two-way coupled simulations, was attractive to quantify changes in porosity and permeability of the reservoir under study with computational cost similar to that of traditional flow simulation. It was possible to explain the positive contribution of pore volume variation to increase oil production and decrease free gas production by statistical analysis of principal components, through 60 simulation scenarios varying both the oil properties and the elastic parameters of the rocks.

COMMITTEE MEMBERS:
Externo à Instituição - MARCOS VITOR BARBOSA MACHADO - PETROBRAS
Externo à Instituição - LUIS CARLOS DE SOUSA JUNIOR - PETROBRAS
Externa à Instituição - FLÁVIA DE OLIVEIRA LIMA FALCÃO - PETROBRAS
Presidente - 2749584 - IGOR FERNANDES GOMES
Externa ao Programa - 2458868 - LICIA MOUTA DA COSTA - null