US 11,898,086 B2
Cationic and anionic shale inhibitors and clay stabilizers
Catherine Martin Santos, Houston, TX (US); Chunli Li, The Woodlands, TX (US); James William Ogle, Pittsburgh, PA (US); and Liang Xu, The Woodlands, TX (US)
Assigned to Halliburton Energy Services, Inc., Houston, TX (US)
Filed by Halliburton Energy Services, Inc., Houston, TX (US)
Filed on May 22, 2020, as Appl. No. 16/882,043.
Claims priority of provisional application 62/897,700, filed on Sep. 9, 2019.
Prior Publication US 2021/0071059 A1, Mar. 11, 2021
Int. Cl. C09K 8/24 (2006.01); C09K 8/68 (2006.01); E21B 21/00 (2006.01); E21B 43/26 (2006.01)
CPC C09K 8/24 (2013.01) [C09K 8/68 (2013.01); E21B 21/00 (2013.01); E21B 43/26 (2013.01); C09K 2208/12 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A method of fracture stimulation comprising:
introducing an anionic friction reducer and 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-tertbutylsulfonic 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 to at least partially inhibit the shale.