aqueous based drilling fluid composition and method to reduce reactivity of clays and shale in drilling operations

摘要

Summary "aqueous based drilling fluid composition and method for reducing reactivity of clays and shale in drilling operations" hydration of clay and shale in drilling operations can be inhibited by employing an aqueous based drilling fluid comprising a sludge inhibiting agent. shale hydration comprising a polyamino polyamide / epichlorohydrin resin, preferably polyamino polyamide / epichlorohydrin resin is a reaction product of an aliphatic polyamine, an aliphatic polycarboxylic acid, and epichlorohydrin. The shale hydration inhibiting agent should be present in the aqueous based drilling fluid in sufficient concentration to reduce reactivity, such as swelling of clays and shale when exposed to aqueous based drilling fluids.