Avalianção da resistência química e mecânica de blendas de resina epóxi para aplicação em operações de reparo e abandono de poços de petróleo e de armazenamento geológico de CO2

Detalhes bibliográficos
Ano de defesa: 2021
Autor(a) principal: Stepanha, Amanda Sofia de Guimarães e lattes
Orientador(a): Dalla Vecchia, Felipe lattes
Banca de defesa: Não Informado pela instituição
Tipo de documento: Dissertação
Tipo de acesso: Acesso aberto
Idioma: por
Instituição de defesa: Pontifícia Universidade Católica do Rio Grande do Sul
Programa de Pós-Graduação: Programa de Pós-Graduação em Engenharia e Tecnologia de Materiais
Departamento: Escola Politécnica
País: Brasil
Palavras-chave em Português:
Palavras-chave em Inglês:
Área do conhecimento CNPq:
Link de acesso: http://tede2.pucrs.br/tede2/handle/tede/10067
Resumo: Class G Portland cement is the conventional material used for well construction, recovery, and abandonment operations. However, there are several studies indicating that this material is quite susceptible to acid environments degradation, as the ones observed in oil wells and CO2 injection wells, which can generate failures and leakages. Therefore, searches for alternative materials to cement has vital importance for the oil and gas industry to guarantee the integrity of wells, especially for well recovery and abandonment operations. In this context, the present work evaluates chemical and mechanical resistance of different commercial epoxy resin blends in conditions found in oil wells/CO2 geological storage reservoirs. The epoxy resin blends were formulated in different proportions and were exposed to degradation tests at 65 °C and 150 bar for 7 days in an aqueous medium saturated with CO2. Physicalchemical and mechanical characterization of the polymeric materials were performed through swelling test, X-ray microtomography (Micro-CT), compression test, scanning electron microscopy (MEV-FEG), atomic force microscopy (AFM), Fourier transform infrared spectroscopy (FTIR), thermal gravimetric analysis (TGA) and differential scanning calorimetry (DSC). Results indicated that the epoxy resin samples showed mechanical properties losses after the CO2 degradation test, due to macro-structural changes. There is no indication of chemical interaction between the epoxy resin blends and CO2. Despite the reduction of mechanical properties, resins can be a good option to repair and abandonment operations. From mathematical models, ideal blends for different well applications were identified.