Banca de QUALIFICAÇÃO: MANUELLE MEIKE SILVA DE ARAUJO ROSADO

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
STUDENT : MANUELLE MEIKE SILVA DE ARAUJO ROSADO
DATE: 28/02/2023
TIME: 16:00
LOCAL: Laboratório de Cimentos (Instituto de Química)
TITLE:

Development of Cement Slurry Systems for High Temperature Wells Using Blast Furnace Slag and Rice Husk Ash

KEY WORDS:

portland cement; blast furnace slag; rice husk ash; high temperature wells; retrogression

PAGES: 70
BIG AREA: Engenharias
AREA: Engenharia Química
SUMMARY:

The development of oil fields that have wells with high viscosity oil, with only primary production, would result in a small volume of oil recovered due to the low productivity of the wells. In this way, there is a need to use in these fields, a supplementary thermal recovery method, where the most used is the cyclic and continuous steam injection. High temperatures cause deleterious changes in hydrated products of Portland cement, compromising its physical properties, mainly, the compressive strength. This phenomenon is known as strength retrogression and occurs when the CaO/SiO₂ ratio is close to 2.0. To deal with this condition, silicon dioxide (SiO₂) rich materials are added to cement. This work aims to use blast furnace slag (BFS) and rice husk ash (RHA) as alternative materials to compose cement slurries systems for application in wells that are subjected to high temperature. A 32 factorial experimental design was carried out to determine the number of cement slurries to be formulated as well as the concentrations of BFS and RHA, which varied from 0% to 50% of BWOC (By Weight Of Cement). Samples containing BFS and RHA and reference samples were submitted to two scenarios: low temperature (47°C) and high temperature (300°C). The low temperature samples remained for 7 days in the thermostatic bath at 47°C. In the high temperature thermal cycle, the samples were subjected to 300°C and 2000 psi for the last 3 days out of 7 in a pressurized curing chamber. All experimental procedures were performed according to API RP 10B-2. The performance of these slurries systems was evaluated for compressive strength (RC) through uniaxial compression tests. This parameter was chosen due to its relevance in the approval of Portland cement-based materials for high temperature wells. It was held too crystallographic characterization of the material tested through the technique of X-ray diffraction (XRD). The standard slurry, without silica, was strongly damaged by the resistance retrogression phenomenon after the 300°C heat cycle. The results showed that in the low temperature scenario, the samples containing BFS showed higher compressive strength and in the high temperature scenario, the samples containing a higher percentage of RHA showed great potential as resistance anti-retrogression agents. BFS is a by-product of the steel industry and its cost is much lower than Class G cement. In addition to being economical, the use of BFS in wells is environmentally sound. And RHA is a renewable source of silica, whose sustainability makes it an interesting alternative to the usual silica flour.

COMMITTEE MEMBERS:
Presidente - 1804366 - JÚLIO CÉZAR DE OLIVEIRA FREITAS
Externo à Instituição - BRUNO LEONARDO DE SENA COSTA - UFRN
Externa à Instituição - FABÍOLA DIAS DA SILVA CURBELO - UFPB