Utilização de látex do tipo SBR e microesferas expansíveis para o desenvolvimento de pastas de cimento flexíveis para poços de petróleo submetidos à injeção de vapor

• Ano de defesa: 2016
• Autor(a) principal: Dias Neto, José Mateus
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Brasil; UFRN; PROGRAMA DE PÓS-GRADUAÇÃO EM QUÍMICA
• Palavras-chave em Português: Pasta de cimento; Látex SBR; Polímero expansível; Cimentação de poços de petróleo; Injeção de vapor; CNPQ::CIENCIAS EXATAS E DA TERRA::QUIMICA
• Link de acesso: https://repositorio.ufrn.br/jspui/handle/123456789/23087

To enable the production of hydrocarbons in heavy oil fields, steam is cyclically injected directly through the well and the cement sheath may be subjected to temperatures up to 300 ° C. This sudden temperature increase causes expansion of the casing that, with the cooling of the well at the end of the cycle, returns to its original dimensions, causing stresses in the cement sheath and generating cracks which may lead to loss of zonal isolation and thus, reduce the productive life of the well and increase spending on interventions to correct the zonal isolation. The use of latex as additive formulation for oil well cement slurries submitted to steam injection has been studied, but research in this area are still being developed. Based on the data already described in the literature, it was used the comparison with SBR latex to evaluate the expandable microspheres of polyacrylamide for their use in steam injection wells. Within this context, this study aims to evaluate mechanical behavior of Portland-based slurries systems containing SBR latex and expandable polymer, applied in oil well cementing of wells submitted to steam injection. Cement slurries were formulated with a density of 1.821 g/cm3 (15.2 lb/gal) and SBR was added with concentrations of 0; 133.7; 267.4 and 401.0 L/m3 (0, 1.0, 2.0 and 3.0 gpc) and 0; 3.0; 6.0 and 9.0% of expandable polymer. API compressive strength tests were carried out with the aid of extensometers for obtaining the elastic modulus and Poisson's ratio, and permeability measurements of cement slurries cured at BHST (Bottom Hole Static Temperature). It was also simulated the steam injection conditions in the curing process. Morphological characterizations, microstructural and thermal analysis (XRD, TGA, FTIR and SEM) were also performed for both, additives and cement slurries. The results showed that the expandable polymer has potential for use in cementing oil wells subjected to steam injection operations.