What is ammonium bisulphite and what is its application in oilfield water treatment?

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Ammonium bisulphite (ABS, NH₄HSO₃) is an oxygen scavenger used in Oman's oilfield water injection systems to remove dissolved oxygen from injection water before it is pumped into reservoirs. Dissolved oxygen is highly corrosive — even at concentrations of 50–100 ppb, it accelerates pitting corrosion of carbon steel pipelines, flowlines, and injection wellbores, causing premature failure. At typical injection water oxygen levels of 0.5–2.0 mg/L entering the treatment train, ammonium bisulphite is dosed at a 3:1–5:1 molar excess to ensure rapid and complete oxygen removal. The reaction is: NH₄HSO₃ + ½O₂ → NH₄HSO₄. Residual ABS concentration in treated water is typically maintained at 5–20 ppm as measured by colorimetric test kits. Ammonium bisulphite is preferred over sodium sulphite for Oman oilfield applications because of its higher reactivity at ambient temperature, lower pH effect, and lower cost per unit of oxygen removed. Global Chemicals LLC supplies liquid ammonium bisulphite for Oman water injection operations.

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