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The Impact of Iron on Scale Inhibitor Performance in the Field – Is it a Problem?

Product Number: 51321-16428-SG
Author: Miriam Barber/Baker Hughes/Wai Y. Mok
Publication Date: 2021
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$20.00
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The general perception in the oil and gas industry is that the presence of ferrous iron in produced water can have adverse effects to the performance of scale inhibitors in controlling the build-up of calcium carbonate (CaCO3) and barium sulfate (BaSO4) scales. However, the exact causes of its impact to scale inhibition are not clearly understood as previous studies appear to be influenced by the type of tests and the procedures adopted. This paper presents some aspects of two case studies on the behavior of several iron tolerant scale inhibitor chemistries in water containing different levels of iron (II) ion. Laboratory assessments of the performance of the inhibitors were based on anaerobic static jar studies, Scanning Electron Microscopy (SEM)/Energy Dispersive X-Ray Spectroscopy (EDXS) analysis and Dynamic Scale Loop (DSL) tests on both calcium carbonate and barium sulphate. Discussion is made to elucidate the mechanisms involved during scale inhibition when in the presence of different levels of iron (II) ion.

Key words: Calcium carbonate; barium sulfate, iron (II), scale inhibitors, efficiency, minimum inhibitor concentration

The general perception in the oil and gas industry is that the presence of ferrous iron in produced water can have adverse effects to the performance of scale inhibitors in controlling the build-up of calcium carbonate (CaCO3) and barium sulfate (BaSO4) scales. However, the exact causes of its impact to scale inhibition are not clearly understood as previous studies appear to be influenced by the type of tests and the procedures adopted. This paper presents some aspects of two case studies on the behavior of several iron tolerant scale inhibitor chemistries in water containing different levels of iron (II) ion. Laboratory assessments of the performance of the inhibitors were based on anaerobic static jar studies, Scanning Electron Microscopy (SEM)/Energy Dispersive X-Ray Spectroscopy (EDXS) analysis and Dynamic Scale Loop (DSL) tests on both calcium carbonate and barium sulphate. Discussion is made to elucidate the mechanisms involved during scale inhibition when in the presence of different levels of iron (II) ion.

Key words: Calcium carbonate; barium sulfate, iron (II), scale inhibitors, efficiency, minimum inhibitor concentration

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