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Unformatted text preview: casing cement job. The six centralizers already on the rig had built‐in stop collars. Stop collars prevent a centralizer from moving up and down the casing and built‐in stop collars are integrated into the centralizer. Other Testimony of Nathaniel Chaisson, Joint Investigation Hearing, August 24, 2010, at 419. Gagliano, testimony at 264. 105 Testimony of Vincent Tabler, Joint Investigation Hearing, August 25, 2010, at 12‐13. 103 104 47 centralizers use stop collars that are separate components and slip onto the centralizers. Because the April 15 OptiCem report predicted less channeling with a total of 21 centralizers, the BP Macondo well team located 15 additional centralizers from Weatherford, an oil‐field service company, and arranged for them to be sent to the BP shore base in Houma, Louisiana, from which the centralizers would be flown to the rig. 106 A Weatherford representative, Daniel Oldfather, however, testified he could not locate all the centralizer materials at the BP shore base. 107 While the 15 centralizers...
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