Case History An operator in the Haynesville Shale in Louisiana had a gas well that produced 300 ppm of hydrogen sul? de (H 2 S). To enable gas shipments, the H 2 S had to be scavenged to 50 ppm. The operator had to scavenge the H 2 S to 0-3 ppm in order to avoid deposition of intractable spent triazine solids. While triazine is a valuable tool in removing H 2 S from oil and gas production, the operator discovered that it can also cause

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