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Polymer adsorption isotherms with NaCl and CaCl2 on kaolinite substrates
Isotermas de adsorción de polímeros con NaCl y CaCl2 en sustratos de caolinita
DOI:
https://doi.org/10.15446/dyna.v86n210.74361Palabras clave:
nhanced Oil Recovery, polymer flooding, analytical models, adsorption, flocculation (en)Recobro mejorado, inyección de polímeros, modelos analíticos, adsorción, floculación (es)
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During polymer – flooding, polymer’s molecules are attached to the surface of the rock as a result of many interactions between both components, leading to a decrease on the injected slug’s concentration. This phenomenon, known as adsorption, depends on rock type, degree of hydrolysis and polymer concentration, reservoir’s temperature, water salinity, among others, and might be predicted by analytical models. This work shows the results of a series of static tests in which water’s salinity (NaCl and CaCl2) and polymer’s concentration were varied, to determine which of the analytical models can predict in a better way the experimental data when kaolinite substrates are used. It is discussed the abnormal trend of the adsorption, where higher NaCl concentrations resulted in lower adsorption results, basically because of a flocculation.
Durante la inyección de polímeros, las moléculas poliméricas son atraídas a la superficie de la roca como resultado de una serie de interacciones entre ambos componentes, llevando finalmente a una disminución en la concentración del bache inyectado. Este fenómeno, conocido como adsorción, depende del tipo de roca, grado de hidrólisis y concentración del polímero, temperatura del yacimiento, salinidad del agua de formación, entre otros, y puede ser estimado a partir de modelos analíticos. Este trabajo muestra los resultados de 144 pruebas estáticas, en donde la salinidad (NaCl y CaCl2) y la concentración de polímero se tomaron como parámetros a variar, con el fin de determinar cuál de los modelos analíticos es capaz de predecir en una forma más acertada los resultados experimentales. Finalmente se discute la tendencia anormal de la adsorción en presencia de NaCl, donde mayores valores de salinidad resultaron en menores valores de adsorción, como respuesta principalmente a la floculación de la caolinita.
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