Avaliação de argilas bentoníticas policatiônicas do estado da Paraíba com aditivos para aplicação em perfuração de poços de petróleo e tintas à base de água

Brito, Barbosa; Cartaxo, J. M.; Nascimento, Neyber Fádio Cavalcanti.; Ferreira, H. C.; Neves, G. A.; Menezes, Romualdo Rodrigues

doi:10.1590/0366-69132016623611978

Cited by 9 publications

(17 citation statements)

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“…Os modelos matemáticos correlacionando os valores de VA, VP e VF com as proporções das amostras de argilas AM1, AM2, AM3 e AM4 são apresentados na Tabela IV. Nas equações de regressão pôde-se observar coeficientes maiores que zero indicando que interagiram sinergicamente e contribuíram para elevar os valores das propriedades; já os coeficientes menores que zero indicaram que interagiram antagonistamente e contribuíram para diminuir os valores destas propriedades [19]. Analisando os termos da equação VA observou-se que foram estatisticamente significativas as amostras individuais AM1*, AM2*, AM3* e AM4*, bem como as composições AM3AM4*, AM1AM3AM4* e AM2AM3AM4*.…”

Section: Resultsunclassified

Modelagem de propriedades reológicas de argilas esmectitas do estado da Paraíba para uso em fluidos de perfuração de poços de petróleo

et al. 2017

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ResumoAtualmente mais de 79% das argilas bentoníticas industrializadas são oriundas das jazidas de Boa Vista, PB. Estes jazimentos vêm sendo minerados de forma desordenada há mais de 40 anos, resultando no esgotamento das variedades mais nobres, havendo sério prejuízo para qualidade do produto final. As empresas mineradoras impõem rígidas condições de comercialização para os produtores, condicionando a aquisição das variedades menos nobres junto às variedades que ainda apresentam propriedades mais adequadas e frequentemente as variedades menos nobres são descartadas no processo produtivo. Este trabalho teve o objetivo otimizar as propriedades reológicas das novas ocorrências de argilas bentoníticas do estado da Paraíba, utilizando a técnica de planejamento experimental de misturas, a fim de adequá-las às exigências da Petrobras e da indústria nacional. As argilas utilizadas foram provenientes dos municípios de Olivedos e Boa Vista, PB. As amostras de argilas foram misturadas utilizando a técnica mencionada e caracterizadas física, química, térmica e mineralogicamente. Após caracterização as argilas foram transformadas em sódicas e foram determinadas suas propriedades reológicas para uso em perfuração de poços de petróleo de acordo com a norma da Petrobras. As variáveis respostas, viscosidade aparente, viscosidade plástica e volume de filtrado, foram avaliadas mediante análises das superfícies de respostas. Os resultados obtidos evidenciaram que as argilas estudadas são promissoras para usos em fluidos de perfuração. Observaram-se ainda melhoras significativas de suas reologias após mistura com as argilas de Boa Vista, PB. Palavras-chave: fluidos de perfuração, argilas bentoníticas, propriedades reológicas, planejamento experimental. Abstract Currently over 79% of industrialized bentonite clays in Brazil come from Boa Vista, PB. These bentonite deposits have been mined disorderly for over 40 years, resulting in the depletion of the noblest varieties, with serious damage to the final product quality. Mining companies impose strict marketing conditions for producers, conditioning the purchase of the less noble varieties with the varieties that still have more suitable properties, and often the less noble varieties are discarded in the production process. This work aimed to optimize the rheological properties of new occurrences of bentonite clays from Paraíba State using the experimental design technique of mixtures in order to adapt them to the requirements of Petrobras and national industry. The clays used in this study

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Section: Resultsunclassified

Modelagem de propriedades reológicas de argilas esmectitas do estado da Paraíba para uso em fluidos de perfuração de poços de petróleo

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“…Drilling fluids must be designed with several characteristics in order to enhance drilling efficiency. Their compositions are chosen to meet these characteristics, such as appropriate viscosity, gel-like consistency, filtrate control, plaster, inhibition of hydratable clay from geological formations, and lubrication coefficient [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Influence of the purification of bentonite clay from new deposits in the state of Paraíba-Brazil for use in water-based drilling fluids

et al. 2018

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Bentonite clay is used all around the world as an additive in drilling fluids. However, impurities present in this material can compromise the compatibility of the clay-fluid system. The present study aimed to analyze the effects of the purification of bentonite samples from new deposits in the state of Paraíba, Brazil, in order to make them usable in water-based drilling fluids. The samples were first purified by centrifugation, and their characteristics were determined using the following techniques: laser granulometry, X-ray diffraction, chemical analysis, cation exchange capacity, thermogravimetric analysis, and differential thermal analysis. After these determinations, the polycationic clay samples were made sodic through the addition of sodium carbonate (Na2CO3) in the proportion of 125 meq/100 g of dry clay. The rheological and filtration properties (apparent viscosity, plastic viscosity, and filtrate volume) were then tested. The results showed that the purification process was efficient for removing accessory minerals such as quartz, iron, and carbonates. With regard to rheological and filtration properties, the results following centrifugation showed that the material can be suitable for use in water-based drilling fluids.

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“…1), since different location extraction resulted in different chemical compositions [2,6]. The results presented are typical of the clays of the State of Paraíba [2,[6][7][8]. Table II shows the granulometric distribution of the polycationic samples A, B, C and D. Analyzing the results obtained, we observed a decrease in the fraction x<2 μm and an increase in the fraction x>20 μm and Dm (average diameter) of samples B and D when compared with samples A and C, showing an increase in the percentage of accessory minerals, mainly containing Ca 2+ , as also indicated in the results of XRD ( Fig.…”

Section: Materials and Methodologymentioning

confidence: 82%

“…As características físico-químicas dos cátions podem ser capazes de it increasingly necessary to discover new occurrences of bentonite clays [7][8][9]. For aqueous drilling fluids, it is essential that there be an interaction between the clay and the water in the dispersions, for the formation of the double electric layer on the clayey surfaces and expansion of the hydrated layers.…”

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

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%

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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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Avaliação de argilas bentoníticas policatiônicas do estado da Paraíba com aditivos para aplicação em perfuração de poços de petróleo e tintas à base de água

Cited by 9 publications

References 10 publications

Modelagem de propriedades reológicas de argilas esmectitas do estado da Paraíba para uso em fluidos de perfuração de poços de petróleo

Modelagem de propriedades reológicas de argilas esmectitas do estado da Paraíba para uso em fluidos de perfuração de poços de petróleo

Influence of the purification of bentonite clay from new deposits in the state of Paraíba-Brazil for use in water-based drilling fluids

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

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