Banca de QUALIFICAÇÃO: YAGO RYAN PINHEIRO DOS SANTOS

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
STUDENT : YAGO RYAN PINHEIRO DOS SANTOS
DATE: 25/07/2022
LOCAL: Pos Graduação Engenharia Civil
TITLE:

Rock-Fluid Interaction In Fractured Synthetic Porous Media

KEY WORDS:

matrix acidizing; chemical dissolution; fractures; geosynthetics; oil wells; synthetic rocks

PAGES: 89
BIG AREA: Engenharias
AREA: Engenharia Civil
SUMMARY:

With the growing world energy demand, it is necessary to use techniques capable of enabling the hycrocarbon exploration in sandstones and carbonates. Among them, matrix acidizing stands out, in which acid solutions are injected into wells at a pressure lower than the fracturing pressures of reservoir formation, increasing or recovering the permeability close to well. The research aims to evaluate the mechanisms of rock-fluid interaction in rocks-reservoir involving the chemical dissolution processes caused by matrix acidizing, using a fractured synthetic porous medium analogous to carbonate rocks and verifying the influence of its experimental and numerical heterogeneities. For synthetic rocks with and without fractures, two different proportions of materials were chosen: 85%:15% and 90%:10% of analogous carbonate powder:epoxy resin, respectively, consolidated through the process of compaction and drying in oven at 60ºC for 24 hours; for fractures representation, non-woven geotextile tapes were chosen, representing porous media with one and two fractures, positioned in specific regions. The specimens were been characterized as to their mechanical and petrophysical properties, and will be subjected to chemical dissolution tests and simulation of the acidification technique through an acid injection cell, applying acetic acid solutions (CH₃COOH) and verifying the action of dissolution processes. The parameters obtained by the dissolution processes will be applied in numerical simulations, using the in-house code CODE_BRIGHT. Synthetic rocks prepared in the proportion 85%:15% reached UCS values between 80 and 90 MPa, while for those prepared in the proportion 90%:10%, these presented UCS values between 50 and 60 MPa; in addition, the presence of geotextile (fractures) did not interfere negatively in the mechanical strength of synthetic rocks. As for porosity, the values were low and with a small increase with the presence of geotextile, being 1.27%, 1.31% and 2.13% for samples prepared in the proportion 85%; 15%, without fractures, with one fracture and with two fractures, respectively, while for rocks prepared with 90%:10% material, this presents values between 12 and 13%. It is noteworthy that the method used synthetic rocks production proved to be satisfactory, guaranteeing a greater strength to what is commonly observed in the literature for synthetic rocks, and a repeatability (desirable when developing synthetic porous media) observed by the similarity of the mechanical behavior of the smples; it is also noted that the proportion of 90% of analogous carbonate powder and 10% of resin presented better porosity results, reaching values close to real carbonate rocks, and satisfactory results of strength, being this proportion defined in this research for the carrying out further tests involving dissolution processes, allowing a better visualization of the rock-fluid interaction between the chemical solutions used and the synthetic medium produced.

BANKING MEMBERS:
Externa à Instituição - ALINE FLÁVIA NUNES REMIGIO ANTUNES - UFPB
Externo à Instituição - MARCOS ALLYSON FELIPE RODRIGUES - UFRN
Presidente - 2749584 - IGOR FERNANDES GOMES
Interno - 1800053 - JOSE ANTONIO BARBOSA