EVALUACIÓN DE UNA UNIDAD HPHT ACOPLADA CON SONDA NIR PARA DETERMINAR EL INICIO DE LA PRECIPITACIÓN DE ASFALTENOS BAJO DIFERENTES PRESIONES
Publicado 2023-09-26
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Esta obra está bajo una licencia internacional Creative Commons Atribución 4.0.
Resumen
Los asfaltenos se caracterizan por ser la fracción de petróleo crudo con mayor masa molar y polaridad, preestableciendo principalmente grupos (poli)aromáticos. La floculación y deposición de asfaltenos provoca grandes pérdidas a la industria petrolera. Es importante comprender el comportamiento de fase de los asfaltenos en condiciones más cercanas a las que se encuentran en los yacimientos. Por lo tanto, la LMCP/UFRJ comenzó a operar una unidad de alta presión y alta temperatura (HPHT) acoplada a una sonda de espectrómetro de infrarrojo cercano que puede utilizar diferentes floculantes. Este trabajo describe el desarrollo de un procedimiento, así como la validación de los resultados obtenidos de esta unidad. Debido a la compleja composición del crudo, se prepararon sistemas modelo (MS) con asfaltenos extraídos con n-pentano (C5I) y n-heptano (C7I). Los experimentos se realizaron a presión atmosférica, titulados con n-heptano, ya 100 y 300 bar titulados con propano.
Como era de esperar, los asfaltenos C7I fueron más inestables, presentando un inicio de precipitación más bajo que los asfaltenos C5I en condiciones ambientales y a presiones más altas. Sin embargo, para ambos MS, la estabilidad aumentó con el aumento de la presión al usar propano como solvente. El método propuesto para evaluar el inicio de la precipitación de asfaltenos fue efectivo para MS en tolueno y crudo muerto, y es una alternativa prometedora para la investigación de diferentes tipos de crudo.
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