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Unformatted text preview: nlikely to have occurred. Keystone presented two remaining possible scenarios under which seal movement could have resulted from well pressure and forces. However, the Panel later ruled out both of these scenarios because well intervention operations following the blowout showed that the wellhead seal assembly had, in fact, remained intact during the blowout. 152 When the Macondo well was secured after the blowout, intervention work began under the direction and supervision of the Unified Area Command with input from BOEMRE, including the Panel and other federal agencies. 153 This intervention work required the participation of companies involved in the drilling of the original Macondo well. During the well intervention operations, observations using remotely operated vehicles (ROVs) found that the Macondo wellhead seal assembly was intact. On September 9, 2010, technicians from Dril‐Quip Inc., a contractor involved in the intervention operations, used a lead impression tool to take an impression of the hanger and seal assembly. A lead impression tool is a high tolerance...
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