Banca de QUALIFICAÇÃO: LUANNA CARLA MATIAS PAIVA

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
DISCENTE : LUANNA CARLA MATIAS PAIVA
DATA : 08/08/2018
HORA: 09:00
LOCAL: Auditório do Laboratório de Cimentos da UFRN
TÍTULO:

Effect of the addition of basalt fibers on the fracture strength of oilwell cements

PALAVRAS-CHAVES:

Oil well cement; Cement slurry; Tenacity; Basalt fibers

PÁGINAS: 84
GRANDE ÁREA: Engenharias
ÁREA: Engenharia Civil
RESUMO:

Although cement slurry can achieve good mechanical development for oil wells, the cement, in turn, presents intrinsic brittleness and low energy to the fracture. The occurrence of fissures in the cement sheath is frequent, causing loss of mechanical stability and zonal isolation. The panorama has imposed new challenges to the technology of oil well cementing, with respect to the performance of fracture resistant cement slurry. For this, materials that make it possible to increase the tenacity of the cement are searched. In this study, cement slurry with addition of basalt fibers were evaluated under actual conditions of well. It was developed, initially, fiber treatment by milling, accompanied by Scanning Electron Microscopy (SEM) and physicochemical characterization of the material by density determination, X-Ray Fluorescence (XRF), X-Ray Diffraction (XRD) and Thermogravimetry (TG). Thereafter, slurry compositions were prepared using 5% fiber (BWOC) and 40% silica flour, under conditions of BHSTs 80°C (176°F) and 300°C (572°F), for 7 days of curing. Uniaxial compression tests were performed in order to investigate the behavior of fracture strength and compression of cement slurries. Microstructural analysis by X-ray diffraction (XRD) and SEM were performed with cement samples. The results showed SiO₂ rich fibers, of specific mass 2.37 g /cm³ and suitable thermal stabilities the temperature conditions of the study. The milling treatment showed a simple, economical and possible technique to adjust average distributions of the fibers for mixing to the cement slurry. Insertion of fiber the compositions of slurry at 80 °C presented more efficient results than at 300 °C. The addition of silica flour combined with the fibers allowed to guarantee better fracture energy increases over the reference slurry, with an increase of approximately 32.0 to 51.0 J.

MEMBROS DA BANCA:
Presidente - 1298936 - ANTONIO EDUARDO MARTINELLI
Interno - 1804366 - JÚLIO CÉZAR DE OLIVEIRA FREITAS
Externo ao Programa - 1754344 - MARCOS ALLYSON FELIPE RODRIGUES