Banca de DEFESA: ALINE NASCIMENTO VASCONCELOS
Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.STUDENT : ALINE NASCIMENTO VASCONCELOS
DATE: 18/02/2022
TIME: 09:00
LOCAL: Remotamente pelo google meet
TITLE:
DIMERS FATTY ACIDS AND FATTY AMIDES: PERFORMANCE IN THE STABILIZATION OF SYNTHETIC-BASED DRILLING FLUIDS
KEY WORDS:
Dimer fatty acid; Fatty amides; Deepwater drilling; Flat rheological
PAGES: 72
BIG AREA: Ciências Exatas e da Terra
AREA: Química
SUBÁREA: Química Orgânica
SPECIALTY: Polímeros e Colóides
SUMMARY:
The performance of drilling fluids in the deepwater enviroments is negatively impacted by the formation of progressive gels. The stability of synthetic-base drilling fluids in offshore deepwater drilling has been acquired by the development of chemical additives that promote the maintenance of rheological properties, even with variations in temperature (flat rheological profile). Thus, fatty amides were synthesized from the condensation reactions between dimer acid and three different amines, separately: Diethanolamine (DEA), Poly(propylene glycol) bis(2-aminopropyl ether) (BPGA440) and Trimethylolpropane tris[poly(propylene glycol), amine terminated] ether (TPGA440) in the presence of N,N'-dicyclohexylcarbodiimide as coupling agent and 4-dimethylaminopyridine as catalyst, at 25°C. The products obtained were characterized by Fourier transform infrared (FTIR) spectroscopy, nuclear magnetic resonance (13C NMR). The results confirmed the amidation reaction between the reagents from the observation of the characteristic signal of the carbonyl group of amides in the FTIR and 13C NMR spectra. The solubility of dimer fatty acid and fatty amides was verified in water, olefin and brine saturated. In water DFA+DEA showed affinity with the aqueous medium, while DFA, DFA+BPGA400 and DFA+TPGA440 showed affinity with the non-polar medium because of the poor hydrophilicity. In addition, surface tension measurements verified that despite the amphiphilic structure of DFA and fatty amides, they do not have surface-active properties. To evaluate of DFA and fatty amides in synthetic-base drilling fluid, electrical stability tests, HTHP filtration and viscosity curves were performed at ambient pressure (~1 bar) and at pressure of 344 bar. At ambient pressure, the fluid with commercial rheological modifier (BDF-TM 990) presented variations in viscosity with the reduction of temperature, while the fluids prepared with DFA and fatty amides exhibited flat rheological profile. However, stable emulsions and rheological profile independent of temperature and pressure variations were obtained using the saturated dimer fatty acid.
BANKING MEMBERS:
Externo ao Programa - 1753094 - ALCIDES DE OLIVEIRA WANDERLEY NETO
Presidente - 1149440 - ROSANGELA DE CARVALHO BALABAN
Externa à Instituição - ROSANGELA REGIA LIMA VIDAL - UFBA