Banca de DEFESA: BRUNO LEONARDO DE SENA COSTA
Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.DISCENTE : BRUNO LEONARDO DE SENA COSTA
DATA : 16/01/2018
HORA: 10:00
LOCAL: Auditório do Laboratório de Cimentos (LABCIM)
TÍTULO:
Corrosive attack on oil Portland cement class G: Studies on the effects of carbonationPALAVRAS-CHAVES:
Carbonation; Oil well cement; Physical properties; Cement hydration; CO2-supercritical; CO2-saturated
PÁGINAS: 92
GRANDE ÁREA: Engenharias
ÁREA: Engenharia de Materiais e Metalúrgica
RESUMO:
In this study the phenomenon of Portland cement carbonation is investigated by different approaches, but converging towards the same objective: to deepen the knowledge of the processes and the effects in the cement matrix. The phenomenon occurs through chemical reactions between carbonic acid, formed by the reaction of CO2 with water, and some hydrated products of cement. In subsurface due to the increase of temperature and pressure the medium becomes more damaging, being therefore, in the area of oil and gas, mainly cementing, has a great interest by this problematic. In view of the above, in this study three articles were developed and published entitled: [Article I] Effects of carbon dioxide in Portland cement: a relation between static sedimentation and carbonation, [Article II] Carbonation in oil well Portland cement: Influence of hydration time prior to contact with CO2 and [Article III] Study of carbonation in a class G Portland cement matrix at supercritical and saturated environments. In the first study, a model was proposed for sedimentation and carbonation behavior in unstable slurry, the static sedimentation based on fluid mechanics. In another study, three slurries of the same formulation were investigated, but were cured for periods of 8 hours, 7 days and 28 days before CO2contact. The results showed distinct processes, but with similar carbonation effects at the end. In addition, in one last study samples were exposed at the same time in supercritical and saturated CO2. The analyzes showed significantly different results, where the samples exposed to the saturated medium suffered a 35% higher attack. This work presents studies that seek to promote a greater understanding of phenomenology and give subsidies for the development of technologies that combat carbonation.
MEMBROS DA BANCA:
Externo à Instituição - CRISTIANE RICHARD DE MIRANDA - PETROBRAS
Presidente - 349770 - DULCE MARIA DE ARAUJO MELO
Externo ao Programa - 1804366 - JÚLIO CÉZAR DE OLIVEIRA FREITAS
Interno - 6347420 - MARCUS ANTONIO DE FREITAS MELO
Externo à Instituição - ULISSES TARGINO BEZERRA - IFPB