Tips for the successful placement of cement plugs
(1) Set the plug on a firm foundation, if one is not available set the plug on an polymer retaining spacer with the same weight as the mud.
(2) Always use a polymer spacer weighted to midway between the mud and the cement slurry. Use a volume of spacer sufficient to give at least a 250 ft separation between the mud and cement.
(3) In order to maximise hole clean up the spacer should leave the stinger at a rate of at least 8 bbls/min. However . . .