Patent ID: 11898086
Assignee: HALLIBURTON ENERGY SERVICES, INC.
Field: Basic materials chemistry (Chemistry)
Classification: CPC C  E | IPC C  E

Claim 8:
9. A method of fracture stimulation comprising:
introducing an additive comprising a salt, a cationic shale inhibitor, and an anionic shale inhibitor into a treatment fluid, wherein the cationic shale inhibitor is present in the additive at a ratio of about 1:2 to about 1:5 by volume of the anionic shale inhibitor,
wherein the cationic shale inhibitor is selected from the group consisting of:
polydiallyldimethylammonium chloride; a cationic polyamine; a quaternary ammonium salt; and any combination thereof;

wherein the anionic shale inhibitor is selected from the group consisting of:
polyacrylamide polymer, copolymer, or terpolymer; polyacrylic acid; polyacrylamide copolymer; a block copolymer of polyacrylamide and 2-acrylamido-2-methylpropane sulfonic acid (AMPS); 2-acrylamido-tertbutyl sulfonic acid (ATBS); poly(acrylamide-co-acrylic acid); and any combination thereof;

wherein the salt is selected from the group consisting of: calcium chloride, sodium chloride, potassium chloride, calcium bromine, ammonium chloride, ammonium nitrate, sodium acetate, and any combination thereof;
wherein the cationic shale inhibitor is present in the additive in an amount of about 2% to about 5% by weight of the additive;

introducing the treatment fluid into a wellbore penetrating at least a portion of a subterranean formation that comprises shale at or above a pressure sufficient to create or enhance one or more fractures in the subterranean formation; and
allowing the additive to interact with the shale in the subterranean formation having a temperature of 150° F. or higher to at least partially inhibit the shale.