Título: | CHARACTERIZATION OF THE WATER-OIL-CALCITE MODEL INTERFACE BY FTIR-ATR AND ITS IMPACT ON ENHANCED OIL RECOVERY APPLICATIONS | ||||||||||||
Autor: |
JESANA MOURA LORETO |
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Colaborador(es): |
ANDRE SILVA PIMENTEL - Orientador FERNANDO LOUREIRO STAVALE JUNIOR - Coorientador |
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Catalogação: | 06/JAN/2025 | Língua(s): | PORTUGUESE - BRAZIL |
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Tipo: | TEXT | Subtipo: | THESIS | ||||||||||
Notas: |
[pt] Todos os dados constantes dos documentos são de inteira responsabilidade de seus autores. Os dados utilizados nas descrições dos documentos estão em conformidade com os sistemas da administração da PUC-Rio. [en] All data contained in the documents are the sole responsibility of the authors. The data used in the descriptions of the documents are in conformity with the systems of the administration of PUC-Rio. |
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Referência(s): |
[pt] https://www.maxwell.vrac.puc-rio.br/projetosEspeciais/ETDs/consultas/conteudo.php?strSecao=resultado&nrSeq=68987&idi=1 [en] https://www.maxwell.vrac.puc-rio.br/projetosEspeciais/ETDs/consultas/conteudo.php?strSecao=resultado&nrSeq=68987&idi=2 |
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DOI: | https://doi.org/10.17771/PUCRio.acad.68987 | ||||||||||||
Resumo: | |||||||||||||
Low salinity water flooding is an advanced oil recovery (EOR) strategy in carbonate
reservoirs, where the concentration and composition of the brine are crucial for oil
removal. This study investigated the chemical and physical aspects of low salinity
water flooding and its impact on oil recovery, focusing on the interaction and
modifications at the oil-calcite interface. FTIR measurements were used to
characterize the adsorption and quantify the removal of mineral oil Nujol on calcite
single crystals cleaved along the (104) plane, before and after conditioning in brines
under different conditions. The results showed that Nujol forms a continuous film
on the calcite surface, preventing its dissolution under aging conditions in lower
salinity brines. The amount of oil removed varied according to the salinity of the
brine. Under the experimental conditions investigated, the freshly cleaved calcite
surface is more efficiently converted from oleophilic to hydrophilic when
conditioned in intermediate salinity condition (LS75). The oil removal was
quantified using semiquantitative FTIR analysis, ranging from approximately 20 percent
for formation water (FW) to about 81 percent after conditioning in LS75. Spectroscopic
analysis indicated a competition between the incorporation of ionic species from
the brine at the interface and the dissolution of calcite, directly affecting the surface
crystallinity. Conditioning with deionized water (DW) did not result in optimal oil
removal due to increased dissolution and re-adsorption of oil molecules. The study
also found that magnesium had a greater influence on oil removal from the surface
compared to calcium. The surfaces previously hydrated with FW and DW showed
significant alterations. Hydration with FW does not necessarily cause dissolution
but promotes the adsorption of OH groups, creating anchoring points for the oil. In
contrast, hydration with DW resulted in a loss of crystallinity, generating defects
on the surface. In both cases, changes in the characteristic vibration bands of nujol
were observed, suggesting different interactions of the oil with the surface.
Comparing the amount of oil adsorbed under the three conditions studied, the
calcite hydrated with FW showed the highest amount of adsorbed oil, associated
with ion adsorption on the surface.
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