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Unformatted text preview: be filled with a higher weight mud to prevent cement from falling into the rat hole and displacing rat hole fluid into the cement column, thus compromising the cement’s properties. The fluid should be of adequate density and properties that there will not be a tendency for the fluid to swap with the cement as it is being placed. API RP 65 (2002). 142 57 Notwithstanding the specific guidance provided by API RP 65, the rig crew filled the rat hole in the Macondo well with 14.0 ppg synthetic oil based mud (SOBM) that was lighter than the cement slurry design. 143 The tail cement was 16.74 ppg. 144 Therefore, the density of the mud the rig crew pumped into the well was not adequate to prevent the type of “fluid inversion” (swapping of fluid and cement) that could compromise the integrity of the cement job. API RP 65 Section 8.2 addresses well preparation using conditioning fluids. It states that: Well preparation, particularly circulating and conditioning fluids in the wellbore, is essential for successful cementing … Common cementing best pra...
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