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

Abstract

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.

Replacement of hydroxyapatite from chicken eggshell waste for ceramic properties improvement

“…The surface morphology tends to be having higher roughness after the addition of hydroxyapatite as seen in the top row of Figure 5A. The presence of Ca 2+ from hydroxyapatite results in the clay particles agglomeration to become larger aggregates 30–32 . This phenomenon can be explained as follows: the positive charge of Ca 2+ diffuses to insert between the negative charges of clay particles causing decrease of the repulsive electrostatic force between the clay particles.…”

“…The presence of Ca 2+ from hydroxyapatite results in the clay particles agglomeration to become larger aggregates. [30][31][32] This phenomenon can be explained as follows: the positive charge of Ca 2+ diffuses to insert between the negative charges of clay particles causing decrease of the repulsive electrostatic force between the clay particles. So, the attractive van der Wal force between clay particles becomes a dominant interaction force resulting in the clay particles agglomeration.…”

Avaliação Da Influência De Aditivos Em Fluido De Perfuração a Base De Água Com Aplicabilidade Em Folhelhos Da Formação Calumbi

“…Em geral, estudos disponíveis na literatura têm demonstrado a influência da adição de inibidores iônicos nas propriedades reológicas de fluidos de perfuração à base de água. As características físico-químicas dos íons de cálcio, inibidores catiônicos, presentes em fluidos de perfuração aquosos podem ser capazes de modificar as propriedades reológicas das argilas bentoníticas (Silva et al, 2019). Estudos usando cátions de lítio (Li + ), sódio (Na + ) e potássio (K + ) mostraram bom desempenho nas propriedades reológicas e de filtração de fluidos ao serem empregados em argilas bentonitas brasileiras (Silva et al, 2018).…”