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Unformatted text preview: ting density (“ECD”). 72 In selecting the synthetic oil‐based mud, BP also sought to reduce fluid loss in order to minimize formation damage while maintaining a higher drilling efficiency. Synthetic oil‐based mud, such as the type BP used in the Macondo well, has many positive features as described above. However, this type of mud also presents risks relating to its effect on the crew’s ability to accurately detect natural gas influx (kicks) into the well. A recent study of drilling fluid mixtures and well control found that drillers might have a harder time detecting kicks March 26, 2010; and BP’s Revised Application for Permit to Bypass, which included a production casing, on April 15, 2010. 71 Society of Professional Engineers, SPE‐116013‐PA ‐ Study of the PVT Properties of Gas—Synthetic‐
Drilling‐Fluid Mixtures Applied to Well Control (2009). “Barite sag” is the settling of barite particles (or other weighting materials), which can result in fluctuations in drilling fluid density. When this occurs in drilling mud, the mud loses its integrity and can only...
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