Because of the possibility that the annulus may not be circulated completely clean, during the first circulation, it may be preferable to work out how the drill pipe pressure should vary as kill mud is pumped around the well. This will allow the drill pipe pressure to be used throughout, so eliminating the possibility of small gas bubbles in the annulus producing misleading information.

The following graphs depict the variations in pressure during the well circulation.



Figure 5.4

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