The plug flow technique is very efficient; but it is limited to cementations of small volumes and where the mud in the hole is of low density. The technique calls for Reynolds numbers of 100 or less, no cement slurry retarders or thinners, and for the cement to be in contact with the mud (no spacer). It can be demonstrated in laboratory experiments that a thickened plug or ball of flocculated cement and mud is formed in the annulus which when aided by buoyancy pushes the mud from the hole.
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