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H₂S Knock Downs

Workers were involved in conducting a 500 litre, 15% hydrochloric acid tubing pickle on a sweet well. After pumping approximately four cubic metres of water down the casing, returns came back dark and gassy. As the degasser line was opened, the rig four-head lower explosive limit (LEL) monitor and the workers’ personal H2S monitors alarmed. All personnel on the tank initiated an evacuation of the area; however, three of the five workers were rendered unconscious after reaching ground level.