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Unformatted text preview: ence that BP’s decision to use 6 centralizers rather than the 21 recommended by Halliburton was a cause of the blowout. E.
Float Collar 1.
Float Collar Function Float collars are one‐way valves installed at or near the bottom of the casing string. When a float collar has been successfully “converted” it will allow fluids to flow in only one direction. A converted float collar allows cement and other fluids to be pumped down the well without reversing direction and coming back up the casing. BP used a Weatherford Model M45AP mid‐bore auto‐fill float collar in the Macondo well, which is depicted in Figure 4 below. The float collar uses a double‐check valve – a mechanical valve that permits fluid to flow in one direction – that is held open by an auto‐fill tube. When running the casing into the well, the auto‐fill tube allows mud to flow into the casing, thereby reducing the force exerted by the mud on the formation and helping to prevent loss of fluids into the formation. To...
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