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Summary Analytical methods are presented for rig-site monitoring of oil muds for H2S and "active" sulfides (such as the neutralization products of lime and H2S) and for small changes in water content. Applications of the two methods are discussed. The sulfide method is a modification of the water-mud API Garrett Gas Train (GGT) procedure adapted to test a sample of whole oil mud. The water-content method is a modification of the conventional retort method that uses a necked-down, precision-calibrated (Kolmer) centrifuge tube as the retort liquid receiver. Additionally, an effective, high-zinc-content, sulfide-scavenging chemical, ZnO, is discussed for use in oil muds as an additive for converting the active sulfides into a more inert form, ZnS. |
