Lube and Bleed

A well control technique that replaces an influx, located immediately below the BOP, with drilling fluid. It involves repeatedly pumping in small quantities of kill mud into the wellbore and then bleeding off excess pressure. It works on the principle that the heavier kill mud will sink below the lighter wellbore fluids and so bleeding off the pressure will remove the latter leaving an increasing quantity of kill mud in the wellbore with successive steps.