Sodium Metabisulphite used as OXYGEN SCAVENGER in drilling fluid?

SODIUM SULPHATE chemically called Sodium Metabisulphite in drilling fluid most commonly used to remove oxygen ions Recommended Treatment range from (0.5-2.0 lb/bbl).

Reaction :
1> When Sodium Meta-Bisulfite Reacts with water releases sulfur dioxide (SO₂).
     Released sulfur dioxide SO₂ however makes the water a strong Reducing Agent.

2> Sodium metabisulfite releases sulfur dioxide in contact with strong acids
    Na₂S₂O₅ + 2 HCl → 2 NaCl + H₂O + 2 SO₂

3> On heating it releases sulfur dioxide, leaving sodium oxide behind.
    Na₂S₂O₅ → Na₂O + 2 SO₂

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