Use of continually injected sulfide scavengers has become more widespread in recent years with increased requirement for sulfide scavengers to be injected directly into water producing streams. The chemicals used, especially those based on common triazine chemistries, impact the pH of the produced water, leading to much more severe scaling tendency and impaired scale inhibitor performance. We have found this to be the case with both water-soluble and oil-soluble scavengers, although the effect is less severe with oil-soluble chemicals. The paper describes the results from a range of tests to examine the performance of a number of different scale inhibitor chemical types in the presence of different scavenger chemicals and different brine systems. We also describe the results of scale prediction modelling, as compared to the lab results and show methodologies which improve the reliability of the scale prediction programmes.

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