Active Sulfide
Active Sulfide :
(n.) Drilling Fluids. A compound of sulfur that contains the S-2 ion. Sulfides can be generated from soluble iron sulfide minerals or from sulfate-reducing bacteria. The term "active sulfide" is used to denote compounds that revert to the highly toxic H2S gas when acidified with 2-molar citric acid solution, as opposed to inert sulfide, which is stable. Active sulfides include calcium sulfide and bisulfide formed when H2S reacts with lime in an oil-base mud. Their accumulation constitutes a safety concern at the rig because of the risk of reverting to H2S gas should an acidic influx occur. They may be converted to inert sulfides by addingzinc oxide. Ant: inert sulfide. See: Corrosion Coupon, Neutralization, Sulfide
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