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

• Autor(a) principal: Stepanha, Amanda Sofia de Guimarães e
• Data de Publicação: 2021
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Biblioteca Digital de Teses e Dissertações da PUC_RS
• Texto Completo: http://tede2.pucrs.br/tede2/handle/tede/10067
• topic: Armazenamento Geológico de CO2; Abandono e Reparo de Poços; Resinas Epóxi; Degradação de Resina Epóxi por CO2; CO2 Geological Storage; Well Repair and Abandonment; Epoxy Resin; Epoxy Resin Degradation by CO2; ENGENHARIAS

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.