N2 foamed spacers prevent annular pressure buildup at Marlin

Use of nitrogen-foamed spacers is a proven mitigation technique for wells with potential problems with annular pressure buildup (APB).In late 1999, BP PLC experienced a well failure in the Marlin development in deepwater Gulf of Mexico. Within hours of starting production, the production tieback casing collapsed, causing the production tubing to fail. An incident investigation team determined two possible causes of the failure: excessive annular pressure buildup (APB) or annular hydrate disassociation. The failure analysis results were applied to the five remaining Marlin wells.1 When these original Marlin wells were batch drilled, several mitigation techniques were not implemented and we...

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