Sodium Metabisulphite used as OXYGEN SCAVENGER in drilling fluid?
Answer
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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