Unformatted text preview: to 3,300 feet below the mud line. This created a risky situation – after displacement of the mud, the well would be in an underbalanced condition and at risk of a well control event. In addition, BP had already eliminated the second cement barrier that would normally be set above the top cement wiper plug. This further increased the well control risks. C.
The Use of Lost Circulation Material as Spacer BP’s plans for displacement of the mud from the riser at the Macondo well called for the use of spacer fluid, which is used to separate the drilling mud from the seawater during displacement. The plans included the use of two different “pills” of spacer. The pills to be used were a blend of leftover lost circulation material that had been mixed on the rig. The lost circulation material (material provided by MI‐SWACO with the trade names Form‐A‐Set and Form‐A‐
Squeeze) had been primarily used to prevent additional lost returns at the well. BP had never used this type of spacer before, and it did not kn...
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