CLAY CONTROL ADDITIVE FOR WELLBORE FLUIDS

摘要

A clay stabilizer which is capable of inhibiting swelling in a wide variety of clay types and is also capable of restoring permeability in formations which have previously been damaged by clay swelling. Amine salts of differin g molecular weights configurations and ionic strength are combined to provide transport into micropores, mesopores and macropores in the formation and to effect cationic change therein. A poly quaternary amine having a high to ver y high charge density is added along with lower molecular weight amine salts t o substantially permanently exchange cations with the clay in the formation.