Banca de DEFESA: NIVIA MORGANA DE OLIVEIRA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : NIVIA MORGANA DE OLIVEIRA
DATE: 29/07/2022
TIME: 14:00
LOCAL: Pos Graduação Engenharia Civil
TITLE:

Geomechanical Characterization and Numerical and Experimental Modeling of Laminated Limestone Tests from the Crato Formation

KEY WORDS:

Fractures. Uniaxial Test. Finite elements. Crato Formation

PAGES: 95
BIG AREA: Engenharias
AREA: Engenharia Civil
SUMMARY:

To understand the fracture system and the permoporous networks of reservoirs composed of low permeability limestone rocks, it is essential to understand the stresses suffered by the rock. The analysis of the mechanical behavior of the rock can be done through the performance of mechanical tests on specimens of rocks, as well as through numerical modeling. The study of the physical process, as well as the search for a mechanical constitutive model that allows predicting the deformation and fracturing of the rock, are fundamental. Analogous outcrops allow the characterization of rock formations, as well as the investigation of the generation, propagation, dimensions and connectivity of fractures, in addition to making possible the collection of rock samples. This dissertation studies laminated limestones from the Crato Formation, located in the Araripe Basin in Northeast Brazil, considered an outcrop analogous to the carbonate rocks of the Brazilian Pre-Salt. The approach involved performing Uniaxial and Diametral Compression tests on the samples to determine mechanical parameters, such as modulus of elasticity and tensile strength. The generation and propagation of fractures of the samples submitted to the Uniaxial Compression test were reproduced through numerical simulations, in a plane deformation analysis, using a mesh fragmentation technique based on finite elements with high aspect ratio, which consists of inserting interface elements between regular elements of a finite element mesh, together with a constitutive model based on damage mechanics. The heterogeneity of the samples is evidenced by the discontinuity of the fractures between the layers. The analysis of the behavior of fractures when subjected to certain stresses, contribute to the understanding of the generation and propagation of fractures in the application of the hydraulic fracturing technique in non-conventional reservoirs.

BANKING MEMBERS:
Interno - 1800053 - JOSE ANTONIO BARBOSA
Externa ao Programa - 3287631 - LEILA BRUNET DE SA BESERRA
Externo à Instituição - OSVALDO JOSE CORREIA FILHO