Banca de QUALIFICAÇÃO: EWERTON LOPES PIRES NETO

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : EWERTON LOPES PIRES NETO
DATE: 04/12/2025
TIME: 09:00
LOCAL: LAPET (Laboratório de Pesquisa em Petróleo)
TITLE:

Rheological Investigation of funcionalized Guar Gum with Hidrofobic Groups Through Alkylation Reactions Aiming at Application as additive for Water-based Drilling Fluids.

KEY WORDS:

Guar Gum; alkylation; rheology; Drilling Fluids

PAGES: 79
BIG AREA: Ciências Exatas e da Terra
AREA: Química
SUBÁREA: Química Orgânica
SPECIALTY: Polímeros e Colóides
SUMMARY:

The increasing demand for environmental and sustainable alternatives in the petroleum industry boosts the utilization of natural polymers as additives in drilling fluids. Guar Gum, a polysaccharide widely used as thickener, was modified by a alkylation reaction through a William Synthesis utilizing 1-brome-hexane as a alkylant agent, aiming the hydrophobization of GG to evaluate its performance as additive in drilling fluid. The proposed synthesis resulted in three alkyl derivatives of GG with degree of substitution of 0,06, 0,08 and 0,14, characterized by infrared spectroscopy and nuclear magnetic resonance of proton (NMR ¹H), dynamic light scattering (DLS), zeta potential and size exclusion chromatography (SEC). The proposed analysis has confirmed the insertion of alkyl chain into GG chemical structure, with an increase of the average diameter of the particles in solution and a reduction in average molar weight. The analysis of rheology indicated a pseudoplastic behavior for all samples, with thermal stability and in condition of salinity. The alkyled GG showed a satisfactory performance on volume filtrate and lubricity tests, indicating that it shows potential to application as a viable environmentally additive in water-based drilling fluid.

COMMITTEE MEMBERS:
Externo à Instituição - ERIVALDO PAULINO DA COSTA - UFRN
Interno - 1803692 - FABRICIO GAVA MENEZES
Interno - 1859346 - MIGUEL ANGELO FONSECA DE SOUZA
Externa à Instituição - NÍVIA DO NASCIMENTO MARQUES - UFRN
Presidente - 1149440 - ROSANGELA DE CARVALHO BALABAN