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Unformatted text preview: of using a liner and tieback. A BP “Management of Change” document stated that this decision was based on the following factors: the long string provided the “best economic case and well integrity case for future completions operations;” the recent cement modeling showed that the long string could be cemented successfully and, while use of a liner “is also an acceptable option,” doing so would add $7‐10 million to the cost of completing the well. 85 The Panel found no evidence that the long string production casing design was a cause of the blowout. 82 Cement lift is increased pump pressure that results when cement that is pumped down the well begins to flow back upward against gravity. 83 BP‐HZN‐MBI00020910. 84 BP‐HZN‐CEC000021857. 85 BP‐HZN‐MBI00143292. “Management of Change” is BP’s formal process for evaluating and approving operational decisions. 38 BP had a third option (other than installing a long strong production casing or a liner tie‐back) – it could have temporarily aband...
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