Monthly Archives: January 2020

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Matrix acidizing of sandstones

Hossein Younesian-Farid published his 2nd paper in the JPSE.  In this study, the interaction of citric acid, as a weak acid, with a sandstone core containing ankerite cement was investigated during matrix acidizing. The model, developed in Python, implemented a global implicit numerical approach to consider acid-rock geochemical interactions. The effect of multi-step dissociation of citric acid on lowering rock pH was investigated. The sugar-lump approach was used to estimate the behavior of the ions concentration originated from the variation of the reactive surface area (RSA). Moreover, the model outputs were validated against matrix sandstone acidizing experiments from the literature.


The concentration of non-ionized acetic acid across the core during the injection of citric acid.