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Previous issue date: 2017-06-28 / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico (CNPq) / O cen?rio atual da ind?stria do petr?leo envolve explorar e produzir reservas com desafios
t?cnicos enormes. Desta forma, torna-se cada vez mais necess?rio o conhecimento dos
mecanismos que impactam a produ??o do ?leo. Um exemplo disso s?o as novas
descobertas no mar brasileiro, como o pr?-sal, composto por grandes acumula??es de ?leo
leve, com alto valor comercial. Um fator determinante a ser considerado ? o tipo de rocha
reservat?rio predominante na forma??o destas reservas, que s?o rochas carbon?ticas,
principalmente o calc?rio, que em sua maioria apresenta molhabilidade favor?vel ao ?leo,
fator que diminui a recupera??o do petr?leo. Assim, estudos v?m sendo desenvolvidos
com esse tipo de rocha visando inverter sua molhabilidade e melhorar a produtividade.
Uma maneira de melhorar essas condi??es no reservat?rio ? atrav?s dos m?todos
qu?micos envolvendo tensoativos, que pela sua natureza anfif?lica, t?m a capacidade de
se adsorver em interfaces e superf?cies de acordo com sua afinidade, diminuindo a energia
livre interfacial, podendo inverter a molhabilidade da rocha, facilitando o fluxo de ?leo e
assim, melhorando sua recupera??o. O objetivo desse trabalho foi estudar como diferentes
tipos de tensoativos se adsorvem na rocha calc?ria, e se eram capazes de alterar sua
molhabilidade. Para isso, foi utilizado o m?todo de banho finito para tr?s tensoativos:
OCS (ani?nico), C16TAB (cati?nico) e ULTRANEX 110 (n?o i?nico), variando-se
par?metros como a temperatura, a massa de adsorverte (calc?rio), tempo de contato e
concentra??o de tensoativo. Tamb?m foram feitas an?lises de ?ngulo de contato para
analisar a molhabilidade e de potencial zeta. O OCS foi o ?nico tensoativo que apresentou
adsor??o significativa na rocha, possivelmente por apresentar ?ons opostamente
carregados aos da rocha. O aumento da temperatura de 30?C para 50?C ocasionou
decr?scimo na capacidade de adsor??o. O calc?rio in natura apresentou molhabilidade
mista, com forte afinidade ao ?leo, que ap?s tratamento ocorreu diminui??o da
molhabilidade ao ?leo, no entanto tamb?m diminuiu em rela??o ? ?gua. As medidas de
potencial zeta mostraram que as atra??es eletrost?ticas desempenharam papel importante
na adsor??o, obtendo-se maior valor em m?dulo para o OCS. / The current scenario of the oil industry involves exploring and producing reserves with
big technical challenges, in this way, it becomes increasingly necessary to know the
mechanisms that impact the oil production. An example of this is the new discoveries in
the Brazilian sea, with the pre-salt, composed of large accumulations of high commercial
value light oil. However, a determining factor to be considered is the type of reservoir
rock predominant in the formation of its reserves. These rocks are composed almost of
carbonates of calcium that form the carbonate rocks, mainly limestone, which in the
majority of them are oil-wet, a factor that Decreases the recovery of oil. Thus, studies
have been developed in this type of rock in order to reverse its wettability and improve
productivity. One way of change the wettability of the reservoir is through the chemical
methods involving surfactants, which by their amphiphilic nature have the ability to
adsorb at interfaces and surfaces according to their affinity, reducing the free interfacial
energy, which can reverse the wettability of the rock, facilitating the flow of oil and thus,
improving its recovery. The objective of this work was to study how different types of
surfactants adsorb in limestone, and if they were able to alter their wettability. For this,
the finite bath method was used for three surfactants: OCS (anionic), C16TAB (cationic)
and ULTRANEX 110 (nonionic), varying parameters such as temperature, adsorption
mass (limestone), contact time and concentration of surfactant. Contact angle analysis
was also performed to analyze wettability and zeta potential. OCS was the only surfactant
that presented significant adsorption in the rock, possibly due to the presence of
electrically charged ions. The increase in temperature from 30 ? C to 50 ? C caused a
decrease in the adsorption capacity. The limestone in natura presented mixed wettability,
with strong affinity to the oil, after treatment the wettability decreased to oil, however it
also decreased in relation to water. The measurements of zeta potential showed that the
eletrostatic attractions played an important role in the adsorption, obtaining greater value
in the module for the OCS.
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/23717 |
| Date | 28 June 2017 |
| Creators | Neves, Allan Martins |
| Contributors | 77938780430, Fernandes, J?ssica Emanuela de Ara?jo, 06461575405, http://lattes.cnpq.br/6114636932635634, Barillas, Jennys Lourdes Meneses, Santanna, Vanessa Cristina |
| Publisher | PROGRAMA DE P?S-GRADUA??O EM CI?NCIA E ENGENHARIA DE PETR?LEO, UFRN, Brasil |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Source | reponame:Repositório Institucional da UFRN, instname:Universidade Federal do Rio Grande do Norte, instacron:UFRN |
| Rights | info:eu-repo/semantics/openAccess |
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