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Unformatted text preview: ril 20. The initial plan included the setting of a lock‐down sleeve prior to displacing drilling mud from the riser. Temporary abandonment procedures do not always include installation of a lock‐down sleeve. Correspondence from late 2009 and early 2010 shows that BP decided to install the lock‐down sleeve as part of its temporary abandonment procedures on the Macondo well to save costs. In January 2010, Merrick Kelley, BP subsea wells team leader, exchanged a number of emails with BP drilling engineer Mark Hafle about the installation of a lock‐down sleeve by the Deepwater Horizon crew. Kelley calculated that this would save $2.2 million in incremental costs: 199 BP‐HZN‐MBI‐00097490. 199 85 Hafle discussed this further with David Sims, and they agreed that the Deepwater Horizon crew should move forward with the installation of the lock‐
down sleeve as part of its temporary abandonment procedures. 200 BP chose to do this even though the Deepwater Horizon was a rig that conducted exploratory drilling ope...
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