# US 10,865,342 B2 · Enhanced high temperature crosslinked fracturing fluids > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,865,342 B2 - Document ID: US10865342B2 - Status: Granted - Kind: B2 - Application number: 16/114,662 - Filed: 2018-08-28 - Published: 2019-02-28 - Granted: 2020-12-15 - Earliest claimed: 2017-08-29 - Assignees: Saudi Arabian Oil Company - Applicants: Saudi Arabian Oil Company - Inventors: Leiming Li; Feng Liang - Web page: https://patentgrep.com/patent/US10865342B2 ## CPC - C09K 8/685: {containing cross-linking agents} - C09K 8/86: containing organic compounds - C09K 8/882: {obtained by reactions only involving carbon-to-carbon unsaturated bonds} - C09K 8/887: {containing cross-linking agents} - C09K 2208/26: Gel breakers other than bacteria or enzymes - C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE ## Abstract A fracturing fluid including a mixture of an aqueous terpolymer composition including a terpolymer, an additive, and crosslinker. The terpolymer includes 2-acrylamido-2-methylpropanesulfonic acid, acrylamide, and acrylic acid monomer units, or a salt thereof. The additive includes a sugar alcohol or a derivative thereof, and the crosslinker includes a metal. The weight ratio of the metal to the terpolymer is in a range of 0.01 to 0.16, and a concentration of the additive is in a range of 0.001 wt. % to 10 wt. % of the fracturing fluid. Treating a subterranean formation includes introducing the fracturing fluid into a subterranean formation, and crosslinking the fracturing fluid in the subterranean formation to yield a crosslinked fracturing fluid. The crosslinked fracturing fluid mitigates damage caused by substantial amounts of total dissolved solids or significant water hardness. ## Claims ### Claim 1 A fracturing fluid comprising a mixture of: an aqueous terpolymer composition comprising water and a terpolymer, the terpolymer comprising 2-acrylamido-2-methylpropanesulfonic acid (AMPS), acrylamide, and acrylic acid monomer units, or a salt thereof, wherein the terpolymer comprises 1 mol. % to 15 mol. % AMPS, wherein the fracturing fluid comprises 20 to 50 pounds of the terpolymer per thousand gallons of the fracturing fluid, and wherein the fracturing fluid comprises; a crosslinker comprising a metal; a clay stabilizer; and an additive comprising a sugar alcohol or a sugar alcohol derivative, wherein a weight ratio of the metal to the terpolymer is in a range of 0.01 to 0.16 and a concentration of the additive is in a range of 0.001 wt. % to 10 wt. % of the fracturing fluid, and wherein, after crosslinking, the fracturing fluid has a viscosity of at least 500 cP for at least 70 minutes when the gel is subjected to a shear rate of 40 s-1 at a temperature in a range of 300° F. to 400° F. ### Claim 2 (depends on 1) The fracturing fluid of claim 1, wherein the additive comprises a sugar alcohol. ### Claim 3 (depends on 2) The fracturing fluid of claim 2, wherein the sugar alcohol comprises at least one of sorbitol, erythritol, mannitol, lactitol, xylitol, and maltitol. ### Claim 4 (depends on 2) The fracturing fluid of claim 2, wherein the concentration of the sugar alcohol is in a range of 0.005 wt. % to 10 wt. % of the fracturing fluid. ### Claim 5 (depends on 1) The fracturing fluid of claim 1, wherein the additive comprises a sugar alcohol derivative. ### Claim 6 (depends on 5) The fracturing fluid of claim 5, wherein the sugar alcohol derivative comprises at least one of a derivative of sorbitol, erythritol, mannitol, lactitol, xylitol, and maltitol. ### Claim 7 (depends on 5) The fracturing fluid of claim 5, wherein the concentration of the sugar alcohol derivative is in a range of 0.05 wt. % to 2 wt. % of the fracturing fluid. ### Claim 8 (depends on 5) The fracturing fluid of claim 5, wherein the sugar alcohol derivative comprises an alkylated sugar alcohol. ### Claim 9 (depends on 1) The fracturing fluid of claim 1, wherein the weight ratio of the metal to the terpolymer is in a range of 0.02 to 0.16. ### Claim 10 (depends on 1) The fracturing fluid of claim 1, comprising at least one of a gel stabilizer, a viscosity breaker, a proppant, and a pH adjusting agent. ### Claim 11 (depends on 10) The fracturing fluid of claim 10, comprising the pH adjusting agent, wherein a pH of the fracturing fluid is in a range of 3 to 6.5. ### Claim 12 (depends on 1) The fracturing fluid of claim 1, comprising between 50 mg/L and 50,000 mg/L of total dissolved solids. ### Claim 13 (depends on 1) The fracturing fluid of claim 1, wherein a concentration of the metal in the fracturing fluid is in a range of 0.001 wt. % to 0.048 wt. %. ### Claim 14 A fracturing fluid comprising a mixture of: a base fluid comprising water; an aqueous terpolymer composition comprising a terpolymer, the terpolymer comprising 2-acrylamido-2-methylpropanesulfonic acid, acrylamide, and acrylic acid monomer units, or a salt thereof, and wherein the terpolymer comprises 1 mol % to 15 mol % of the 2-acrylamido-2-methylpropanesulfonic acid monomer units and wherein the fracturing fluid comprises 20 to 50 pounds of the terpolymer per thousand gallons of the fracturing fluid; a crosslinker comprising a metal; a clay stabilizer; and an additive comprising a sugar alcohol or a sugar alcohol derivative, wherein a weight ratio of the metal to the terpolymer is in a range of 0.01 to 0.16, a concentration of the additive is in a range of 0.001 wt. % to 10 wt. % of the fracturing fluid, and wherein, after crosslinking, the fracturing fluid has a viscosity of at least 500 cP for at least 70 minutes when the gel is subjected to a shear rate of 40 s-1 at a temperature in a range of 300° F. to 400° F. ### Claim 15 (depends on 14) The fracturing fluid of claim 14, wherein the additive comprises a sugar alcohol. ### Claim 16 (depends on 15) The fracturing fluid of claim 15, wherein the sugar alcohol comprises at least one of sorbitol, erythritol, mannitol, lactitol, xylitol, and maltitol. ### Claim 17 (depends on 15) The fracturing fluid of claim 15, wherein the concentration of the sugar alcohol is in a range of 0.005 wt. % to 10 wt. % of the fracturing fluid. ### Claim 18 (depends on 15) The fracturing fluid of claim 15, wherein the additive comprises a sugar alcohol derivative. ### Claim 19 (depends on 18) The fracturing fluid of claim 18, wherein the sugar alcohol derivative comprises at least one of a derivative of sorbitol, erythritol, mannitol, lactitol, xylitol, and maltitol. ### Claim 20 (depends on 18) The fracturing fluid of claim 18, wherein the concentration of the sugar alcohol derivative is in a range of 0.05 wt. % to 2 wt. % of the fracturing fluid. ### Claim 21 (depends on 18) The fracturing fluid of claim 18, wherein the sugar alcohol derivative comprises an alkylated sugar alcohol. ### Claim 22 (depends on 14) The fracturing fluid of claim 14, wherein the crosslinker comprises a water-miscible, non-aqueous fluid.