	US 7,549,474 B2
	Servicing a wellbore with an aqueous based fluid comprising a clay inhibitor
Rob Valenziano, Magnolia, Tex. (US); Kirk L. Harris, Midland, Tex. (US); and Mark D. Dixon, Houston, Tex. (US)
Assigned to Halliburton Energy Services, Inc., Duncan, Okla. (US)
Filed on May 11, 2006, as Appl. No. 11/382,757.
Prior Publication US 2007/0261849 A1, Nov. 15, 2007
Int. Cl. E21B 33/16 (2006.01)

U.S. Cl. 166—291 [507/225]

22 Claims

1. 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.