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Increase the mud weight to eliminate pressurized caved shale.
Use shale inhibition drilling fluids such as KCl polymer mud, Silicate mud or oil-base mud.
It is a common practise to increase the mud weight in a pressurized shale to control the formation
Low WOB,High mud flow,high RPM,Low ROP
Control drill with a reduced WOB monitoring the shakers for splintery returns.