Efeito do armazenamento de argilas esmectíticas nas suas propriedades reológicas

Silva, I. A. da; Sousa, F. K. A.; Ferreira, H. S.; Neves, G. A.; Ferreira, H. C.

doi:10.1590/0366-69132017633652070

Cited by 7 publications

(42 citation statements)

References 23 publications

(45 reference statements)

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“…Sendo assim, existe grande diversidade de aplicações que envolve as argilas e suas possíveis modificações, a exemplo do uso em fluidos de perfuração [5][6][7]. Quando se trata de processos de perfuração, os fluidos são considerados como 'o sangue' desse processo e a indústria do petróleo vem a cada dia exigindo uma constante busca por fluidos de perfuração adequados para suportar condições extremamente severas de temperatura e pressão.…”

Section: Introductionunclassified

Influência dos cátions lítio (Li + ), sódio (Na + ) e potássio (K + ) na reologia de bentonitas brasileiras para uso em fluidos de perfuração base aquosa

et al. 2018

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ResumoOs cátions lítio (Li + ), sódio (Na + ) e potássio (K + ) encontram-se em primeiro lugar no plano de seletividade para a obtenção de bentonitas monocatiônicas a partir das policatiônicas, influenciando de forma específica o comportamento reológico dos fluidos de perfuração base água. O objetivo deste trabalho foi estudar a influência do Li + , Na + e K + na reologia de bentonitas do estado da Paraíba, Brasil, para uso em fluidos de perfuração à base de água. Os novos depósitos de bentonitas brasileiras foram comparados com base nas suas características químicas, físicas, mineralógicas, propriedades reológicas e de filtração. As amostras de bentonitas foram caracterizadas por meio da composição química através do método clássico, capacidade de troca de cátions, análise granulométrica por difração a laser, difração de raios X e análises térmicas. A reologia das dispersões foi estudada e determinadas as viscosidades aparente, viscosidade plástica e limite de escoamento com base nas normas da API e Petrobras, além dos estudos de inchamento em água e filtrado. Os resultados mostraram uma melhora significativa nas propriedades reológicas e de filtração das dispersões após a aditivação com os carbonatos de lítio e de sódio, nessa ordem, havendo presença de tixotropia nas curvas de fluxo das dispersões de argilas estudadas. Palavras-chave: bentonitas, carbonatos alcalinos, fluidos de perfuração. Abstract

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Section: Introductionunclassified

Influência dos cátions lítio (Li + ), sódio (Na + ) e potássio (K + ) na reologia de bentonitas brasileiras para uso em fluidos de perfuração base aquosa

et al. 2018

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“…The process of additivation used to modify the polycationic samples in monocationic was carried out taking into consideration the CEC moisture of the bentonite clays in use, calculating the gram equivalent and the milligram unit of the carbonate involved. Using the mass of the sample (dry clay) used, the mass of sodium carbonate required to add to the clay was calculated [6]. Water was then added so that an ideal humidity of 30%-40% was reached and placed in closed bags during 5 days for curing so that the additive process was effective [2,6].…”

Section: Materials and Methodologymentioning

confidence: 99%

“…The use of chemical dispersants is important in obtaining deflocculated mineral dispersions [3,12]. In general, Brazilian bentonite clays are polycationic, with a predominance of calcium due to the formation or geological origin, and traditionally they are transformed into sodium by the addition of sodium carbonate (Na 2 CO 3 ) [4][5][6][7][8]13]. The presence of clays in the calcic and polycationic form leads to unsatisfactory rheological results.…”

Section: Influence Of Ca 2+ In the Rheological Properties And Filtratmentioning

confidence: 99%

“…In the process of cation exchange, Na + ions traditionally substitute Ca 2+ ions, leading to a better condition in the deflocculation state, resulting in suitable rheological properties for the use of sodium nitrite clays as a key component in waterborne drilling fluids. In addition to structural or substitutional Ca 2+ , there may also be contamination of bentonite clays during industrial processing, due to the high turnover of mills for materials of different compositions [6]. The cation exchange reactions are selective, with a predominance of empirical data in the current context.…”

Section: Influence Of Ca 2+ In the Rheological Properties And Filtratmentioning

confidence: 99%

“…The search for new occurrences of bentonite clays in the State of Paraíba, Brazil, has become more and more important since, due to the disordered extraction of the bentonite clays in this State, the clays of the best mineralogical compositions have been depleted [4,6]. Mineral accessories (mainly quartz, cristobalite, mica, calcite, dolomite and feldspars) compromise the technological applications of bentonite clays, mainly their rheological properties that are greatly found in clays commercialized today, which makes…”

Section: Introductionmentioning

confidence: 99%

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Influence of Ca2+ in the rheological properties and filtration of bentonitic clay dispersions in aqueous drilling fluids

Silva

Buriti

et al. 2019

Cerâmica

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The physicochemical characteristics of cations may be able to modify the rheological properties of bentonite clays, such as their loads, exchangeable cation sizes adsorbed on clay minerals, hydration behaviors and different intercalations with the bentonite structural layer effect of the cations present on the rheology of dispersions of bentonite clays. In this way, the objective was to study the influence of Ca2+ on the rheological and filtration properties of dispersions of new occurrences of bentonite clays from the State of Paraíba, Brazil, in aqueous drilling fluids. Four bentonite clays were selected, being characterized chemically, physically and mineralogically. Sodium carbonate was then added to the clays, and the rheological and filtration behavior of their dispersions were studied. The results showed the direct influence of the Ca2+ present and its implications, resulting from physicochemical interactions, on the rheological and filtration properties of dispersions of bentonite clays.

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Ageing characteristics related to cation exchange and interlayer spacing of some Brazilian bentonites

Carmo

Angélica

Paz

2021

Heliyon

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This study investigated the influence of cation type on the sodium deactivation of Brazilian bentonite varieties. Four bentonite clays were studied, including three mixed-cationic and one magnesium. Swelling and the main exchangeable cations (Na + , K + , Mg 2+ and Ca 2+ ) were the main evaluation parameters in this study. Periodic washes of the sodium-activated bentonites were performed based on the hypothesis that a possible desorption of the cations (primarily Na + ) could cause the deactivation. Sodium activation was monitored using XRD measurements and an increase in swelling. Sodium deactivation was observed and monitored via a decrease in swelling. Positive and negative effects, caused by the proportions of the cations and the dominance of Mg 2+ , were emphasized by the set of cationically different samples applied in this study, which helped to answer the influence of main exchangeable cations, specially Mg 2+ , on the deactivation process.

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Efeito do armazenamento de argilas esmectíticas nas suas propriedades reológicas

Cited by 7 publications

References 23 publications

Influência dos cátions lítio (Li + ), sódio (Na + ) e potássio (K + ) na reologia de bentonitas brasileiras para uso em fluidos de perfuração base aquosa

Influência dos cátions lítio (Li + ), sódio (Na + ) e potássio (K + ) na reologia de bentonitas brasileiras para uso em fluidos de perfuração base aquosa

Influence of Ca2+ in the rheological properties and filtration of bentonitic clay dispersions in aqueous drilling fluids

Ageing characteristics related to cation exchange and interlayer spacing of some Brazilian bentonites

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