New scale inhibitor chemistries were evaluated for providing mitigating benefits against calcite and iron sulfide scale deposition using a high pressure capillary tube blocking apparatus (CTBA). The tests were conducted using brine, with and without iron sulfide contaminants dissolved into the fluid. The CTBA study provided direction on which chemistries work best when iron sulfide poisoning is prevalent. Best performing products selected in the CTBA protocol were re-evaluated for mitigating benefits on calcite precipitation induction time tests. In the induction study fine particles of pyrite deposits (FeS2) and/or finely dispersed sand (SiO2) were dispersed into the brine. This latter technique more closely models and evaluates the field brine scaling conditions, with and without scale inhibitor addition. The combined study was effective in detailing the root cause analysis for the offshore oil producing platforms equipment fouling mechanism. The study was also useful for identifying candidates for field trial. Subsequent field monitoring data indicates the new products provide mitigating benefits against calcite and pyrite mineral scale deposition, particularly within the crude oil run down coolers.

Subject
Water, Precipitation (solids), Sand, Iron sulfides, Tubes, Scale inhibitors, Bottles, Calcite, Liquids, Pyrite, Corrosion inhibitors, Brines, Oil
Keywords:
pyrite effects on calcite crystal growth, platform scale control, crude cooler fouling, iron sulfide
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2004
Association for Materials Protection and Performance (AMPP)
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