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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