Banca de DEFESA: VALDIC LUIZ DA SILVA

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
DISCENTE : VALDIC LUIZ DA SILVA
DATA : 26/07/2019
HORA: 14:30
LOCAL: a definir
TÍTULO:

APPLICATION OF MICROEMULSIFIED SYSTEMS AS CLEANUP FLUIDS, TO REMOVE FILTER CAKE FROM NON-AQUEOUS DRILLING FLUID

PALAVRAS-CHAVES:

surfactants, microemulsion, cleanup fluids, filter cake, wettability

PÁGINAS: 150
GRANDE ÁREA: Ciências Exatas e da Terra
ÁREA: Química
SUBÁREA: Físico-Química
ESPECIALIDADE: Química de Interfaces
RESUMO:

Drilling fluids with specific purposes are used in the drilling of oil extraction wells, including the formation of a thin film of low permeability (filter cake) on the walls of the well. However removal of the plaster is necessary so that the cementation between the rock formation and the coating is efficient. The refore in this process wash fluids are known as "washers" that are intended to remove the filter cake formed by the drilling fluid. The use of microemulsion systems as a cleanup fluids have stood out, mainly by removing the nonaqueous drilling fluids and promoting the inversion of the wettability of the formation. In this context, this work developed and characterized microemulsion systems based on the construction of pseudo-diagrams formulated with cationic surfactants (DAC) and anionic (SDS) for use as a cleaning fluid  that was compatible and wettable to the cement- coating. The formulated microemulsion systems were characterized by the study of: plaster removal efficiency tests, reuse of efficient rendering systems, surface tension measurements, droplet diameter, solids and liquids content (drilling fluid), thermal stability (thermogravimetric curves T / G and DTG), rheology, compatibility, wettability and compressive strength (UCA). The results with cleanup fluids, formulated with cationic surfactant (DAC), provided 100% removal efficiency for direct and bicontinuous micelles, and 98.48% for reverse micelle when these fluids have a C / T ratio of 40% in their composition. DAC-16 cleaning fluid, which has the composition 11.6% C / T, 2.4% FO and 86% FA, removed 100% of rendering and improved the wettability of the rock to water and is compatible with the system. The systems formulated with anionic surfactant (SDS) provided 100% removal efficiency for direct, bicontinuous and reverse micelles for fluids with a C / T ratio of 40% in their composition. LC-7.7 fluid, 30% C / T composition, 10% F / O and 60% FA, removed 100% plaster, excellent wettability of the water formation and compatibility with the cement paste.

MEMBROS DA BANCA:
Presidente - 1753094 - ALCIDES DE OLIVEIRA WANDERLEY NETO
Externa à Instituição - FABIOLA DIAS DA SILVA CURBELO - UFPB
Interno - 1198847 - JOSE LUIS CARDOZO FONSECA
Interno - 1804366 - JÚLIO CÉZAR DE OLIVEIRA FREITAS
Externa à Instituição - MONICA RODRIGUES DE OLIVEIRA - UFERSA