Through their Drilling Rig Inspection Program, the incorrect usage of these unions on degasser lines has been identified. These unions are a quick connect method typically seen on the suction line between a mud tank and mud pump and on the flow line return to the shale shaker. Ignition also becomes a concern. Information gathered from manufacturers reveal the proper use of these unions to be restricted to fluid applications with low concentrations of H2S. A sealing tube for higher concentrations is available. However no performance guarantee of the elastomer in sour gas service is provided.
Problems Seal integrity of the union depends upon proper installation and regular maintenance.
Air, affected by cold temperature, presents pressure maintenance problems. Pressure differentials within the tubulars during a kick situation require a constant readjustment of the seal inflate air pressure to maintain integrity of the seal. Immediate assessment of equipment by all Rig Managers and Drilling Contractors should be carried out immediately to ensure a safe work environment for worksite personnel.