Banca de DEFESA: KAROLINE NÓBREGA CELINO

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : KAROLINE NÓBREGA CELINO
DATE: 13/12/2021
TIME: 13:30
LOCAL: VIDEOCONFERÊNCIA
TITLE:

Analysis of the glycerin viability as a polar phase of an emulsion based glycerin in olefin for drilling oil wells.

KEY WORDS:

Drilling fluid; glycerin; olefin; invert emulsion

PAGES: 69
BIG AREA: Ciências Exatas e da Terra
AREA: Química
SUBÁREA: Físico-Química
SPECIALTY: Química de Interfaces
SUMMARY:

The drilling in ultra-deep waters presents a series of difficulties and specificities, related to the depth of the well, water depth, high pressures and salt
formations found in the pre-salt basins. Moreover, there is still a need to use fluids in compliance to environmental legislation for cleaning and disposing of
cuttings at sea. In this sense, inverted emulsion fluids, from brine in olefin, are favorable and have been used extensively for this application. The fluids need
to maintain their rheological properties throughout the entire drilling, also considering the variation of temperature, in order to minimize the formation of
hydrates, interaction with clayey areas, interaction with saline zones and damage to the formation. The hypothesis of this thesis is that the substitution of
brine for glycerin can promote the maintenance of rheological properties, as well as mitigate the interaction with clay and salt zones, not potentiate the
formation of hydrates and give a destination to a residue from the production of biodiesel. For this purpose, in the preliminary study, the physical-chemical
characteristics of the dispersed phase and the continuous medium were studied for application in an emulsified system of glycerin in olefin. Keeping in mind
the initial characteristics, the emulsified system was applied as a drilling fluid, using commercial additives and comparing the rheological responses varying
the temperature. The interaction with saline and clay zones was investigated by assessing the interaction of the dispersed phase and the continuous medium
using clay and salt plugs. Among the main results, the glycerin obtained as a by-product of biodiesel was compatible with the commercial additives used in
drilling fluids based on brine in olefin, demonstrating the feasibility of immediate application in drilling fluids, given the maintenance of rheological
properties, decreasing the volume of filtrate and less reactivity towards salt and clay areas. In this way, the thesis presented a new composition of drilling
fluid in ultra-deep waters, with the potential to minimize damage to the rock formation, through the use of a residue from the biodiesel production industry,
without the need for previous treatments.

BANKING MEMBERS:
Externo ao Programa - 1753094 - ALCIDES DE OLIVEIRA WANDERLEY NETO
Externo à Instituição - FABIO PEREIRA FAGUNDES - UFERSA
Externa à Instituição - FABÍOLA DIAS DA SILVA CURBELO - UFPB
Interno - 1804366 - JÚLIO CÉZAR DE OLIVEIRA FREITAS
Presidente - 1149440 - ROSANGELA DE CARVALHO BALABAN