Patent ID: 7549474

Claim:
A method of servicing a wellbore in contact with a subterranean formation comprising: placing an aqueous composition comprising a mud displacement fluid; a surfactant and a clay inhibitor into the wellbore, wherein the surfactant comprises tertiary alkyl amine ethoxylates, mixtures of ethoxylated alcohol ether sulfates, and alkyl or alkene amidopropylbetaine surfactants, wherein the clay inhibitor is a nonionic polyacrylamide, a low molecular weight nonionic polyacrylamide, a high molecular weight nonionic polyacrylamide, a polymeric heterocyclic nitrogen-containing compound, polyvinyl pyrrolidone or combinations thereof, wherein the polyvinyl pyrrolidone is a straight chain polyvinyl pyrrolidone, a crosslinked polyvinyl pyrrolidone or combinations thereof, and wherein the mud displacement fluid is a spacer fluid.