Banca de QUALIFICAÇÃO: ELAYNE ANDRADE ARAUJO

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
STUDENT : ELAYNE ANDRADE ARAUJO
DATE: 28/06/2024
TIME: 09:00
LOCAL: MODO REMOTO
TITLE:

Assessment of Damage to Porous Media resulting from Reinjection of Produced Water

KEY WORDS:

Oil-in-water emulsion, Berea sandstone, waterflooding, retenton, formation damage,
injectivity.

PAGES: 60
BIG AREA: Engenharias
AREA: Engenharia Química
SUBÁREA: Tecnologia Química
SPECIALTY: Petróleo e Petroquímica
SUMMARY:

Waterflooding is a widely used technique in oil recovery, and as such, there has been growing interest in using produced water as an injection fluid. Many studies have reported a reduction in permeability due to the retention of emulsified oil droplets during the reinjection of produced water. However, the formation damage mechanisms of oil-in-water emulsions, are not yet fully understood. Therefore, this work has as objective investigate the stability of these emulsions and propose a new approach to evaluate the impact of each component on the reduction of rock permeability. Emulsions were prepared by varying the surfactant concentration (0.0025 to 0.0100 wt%), stirring speed (9,000 to 21,000 rpm) and oil concentration (0.0050 to 0.0500 wt%). Subsequently, coreflooding tests were conducted on Berea sandstone samples with different permeabilities and emulsions with different volumetric oil concentrations, evaluating the permeability loss in three stages. Emulsions with interfacial tensions over 10.582 mN/m remained stable and unimodal throughout the analyzed period. Coreflooding tests showed that brine injection resulted in a permeability reduction of 7% to 20% in rocks with approximate permeabilities of 20
mD and 120 mD, respectively. In sequence, the injection of surfactant showed a permeability decrease ranging from 30% to 40% in the first section. Tests with emulsions containing oil concentration of 0.05 wt% and 0.01 wt% caused a reduction to around 65% of the equivalent permeability in low-permeability rocks. Damage arising from the retention of oil droplets was more significant in all scenarios studied, especially in low-permeability rocks. The results indicated that all components present in the emulsion contributed to the reduction of rock permeability, highlighting the importance of considering them when incorporating them into mathematical
models to predict injectivity loss.

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