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A class of water muds that use partially-hydrolyzed polyacrylamide (PHPA) as a functional additive, either to control wellbore shales or to extend bentonite clay in a low-solids mud.As a shale-control mud, PHPA is believed to seal microfractures and coat shale surfaces with a film that retards dispersion and disintegration. KCl is used as a shale inhibitor in most PHPA mud designs.
analytical method for the determination of the PHPA polymer content of drilling mud and other water-base fluids has been evident for some time. PHPA is a short-chain polymer which is special from other type of polymer that is used in the mud system either to control wellbore shales or to extend bentonite clay in a low-solids mud.
