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Unformatted text preview: The Panel used actual flow values to calculate that the losses amounted to approximately 80 bbls (+/‐ 10% based on flow‐in /flow‐
out data). The fact that the Deepwater Horizon crew did not have available to them accurate and reliable flow‐line sensors during cementing operations in order to determine whether they were obtaining full returns was a possible contributing cause of the blowout. There were a number of limitations in the cementing plan that could have contributed to the compromise of the cement job, including the following: Reducing the bottoms up circulation from 2,760 bbls to approximately 350 bbls could have increased the likelihood of channeling because: a) there was less cleaning of the wellbore, and b) the reduced bottoms up prevented rig personnel from examining, prior to cementing, the mud for potential contamination by hydrocarbons; Pumping cement at the relatively low flow rate of 4 bpm could have decreased the efficiency with which cement displaced the mud from the annular space, thereby increasing the potential for channeling; and 71 Limiting the volume of cement to approximatel...
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