# US 2021/0340427 A1 · Novel corrosion inhibitor for various acids > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0340427 A1 - Document ID: US20210340427A1 - Status: Published application - Kind: A1 - Application number: 17/253,748 - Filed: 2019-06-14 - Published: 2021-11-04 - Earliest claimed: 2018-06-19 - Assignees: Fluid Energy Group Ltd. - Applicants: Fluid Energy Group Ltd - Inventors: Clay PURDY; Markus WEISSENBERGER - Web page: https://patentgrep.com/patent/US20210340427A1 ## CPC - C09K 8/528: inorganic depositions, e.g. sulfates or carbonates - C09K 8/54: Compositions for in situ inhibition of corrosion in boreholes or wells - C09K 8/035: Organic additives - C09K 8/52: Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning - C09K 8/74: combined with additives added for specific purposes - C23F 11/04: in markedly acid liquids - C23F 11/145: {Amides; N-substituted amides} - C23F 11/162: {Thioaldehydes; Thioketones} - C23F 11/167: Phosphorus-containing compounds - C09K 2208/32: Anticorrosion additives - C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE - C23F: NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE (working metal by laser beams B23K26/00; desurfacing by applying flames B23K7/00; working of metal by electro-erosion B23H; producing decorative effects by removing surface material, e.g. by engraving, by etching, B44C1/22; electrolytic etching or polishing C25F); INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25 ## Abstract A liquid corrosion inhibitor composition for use with acid compositions for use in industrial activities, said corrosion inhibitor composition comprising: a thiourea derivative; a first type of amphoteric surfactant is selected from the group consisting of: a sultaine surfactant; a betaine surfactant; and combinations thereof; a second type of amphoteric surfactant; and a solvent. ## Claims ### Claim 1 A liquid corrosion inhibitor composition for use with a chrome-friendly modified acid composition for use in downhole oil industry activities, said corrosion inhibitor composition comprising: a thiourea derivative; a first type of amphoteric surfactant is selected from the group consisting of: a sultaine surfactant; a betaine surfactant; and combinations thereof; a second type of amphoteric surfactant; and a solvent. ### Claim 2 (depends on 1) The corrosion inhibitor according to claim 1, wherein the thiourea derivative is 1,3 diethyl-2-thiourea. ### Claim 3 (depends on 1) The corrosion inhibitor according to claim 1, wherein the sultaine surfactant and betaine surfactant are selected from the group consisting of: an amido betaine surfactant; an amido sultaine surfactant; and combinations thereof. ### Claim 4 (depends on 3) The corrosion inhibitor according to claim 3, wherein the betaine surfactant is an amido betaine comprising a hydrophobic tail from C8 to C16. ### Claim 5 (depends on 4) The corrosion inhibitor according to claim 4, wherein the betaine is cocamidopropyl betaine. ### Claim 6 (depends on 1) The corrosion inhibitor according to claim 1, wherein the second-type of amphoteric surfactant is beta.-Alanine, N-(2-carboxyethyl)-N-dodecyl-, sodium salt (1:1). ### Claim 7 (depends on 1) The corrosion inhibitor according to claim 1, wherein the solvent is an alcohol selected from the group consisting of: water, methanol, ethanol and isopropanol and combinations thereof. ### Claim 8 (depends on 7) The corrosion inhibitor according to claim 7, wherein the solvent is a combination selected from the group consisting of: isopropanol-water; isopropanol-methanol; methanol-ethanol; ethanol-water and methanol-water. ### Claim 9 (depends on 1) The corrosion inhibitor according to claim 1, wherein the thiourea derivative is present in a concentration ranging from 10 to 90% of the weight of the composition. ### Claim 10 (depends on 1) The corrosion inhibitor according to claim 1, wherein the thiourea derivative is present in a concentration ranging from 15 to 50% of the weight of the composition. ### Claim 11 (depends on 1) The corrosion inhibitor according to claim 1, wherein the thiourea derivative is present in a concentration ranging from 20 to 40% of the weight of the composition. ### Claim 12 (depends on 1) The corrosion inhibitor according to claim 1, wherein the thiourea derivative is present in a concentration of approximately 30% of the weight of the composition. ### Claim 13 (depends on 1) The corrosion inhibitor according to claim 1, wherein the betaine surfactant is present in a concentration ranging from 5 to 90% of the weight of the composition. ### Claim 14 (depends on 1) The corrosion inhibitor according to claim 1, wherein the betaine surfactant is present in a concentration ranging from 5 to 30% of the weight of the composition. ### Claim 15 (depends on 1) The corrosion inhibitor according to claim 1, wherein the second surfactant is present in a concentration ranging from 5 to 90% of the weight of the composition. ### Claim 16 (depends on 1) The corrosion inhibitor according to claim 1, wherein the second surfactant is present in a concentration ranging from 5 to 30% of the weight of the composition. ### Claim 17 (depends on 1) The corrosion inhibitor according to claim 1, wherein the solvent is present in a concentration ranging from 10 to 90% of the weight of the composition. ### Claim 18 (depends on 1) The corrosion inhibitor according to claim 1, wherein the solvent is present in a concentration ranging from 20 to 80% of the weight of the composition. ### Claim 19 (depends on 1) The corrosion inhibitor according to claim 1, wherein the solvent is present in a concentration ranging from 30 to 70% of the weight of the composition. ### Claim 20 (canceled) ### Claim 21 (depends on 1) A corrosion inhibitor composition according to claim 1 for use with an acid composition, said acid composition is selected from a group consisting of: HCl; HCl-urea in a molar ratio ranging from 0.1:1.0; phosphoric acid; and urea-phosphoric acid or a derivative thereof in a molar ratio of not less than 0.1:1. ### Claim 22 A modified acid composition comprising an acid selected from the group consisting of: HCl; HCl-urea; phosphoric acid-urea, and a phosphoric acid derivative; and a corrosion inhibitor composition comprising: a thiourea derivative; a betaine surfactant; an amphoteric surfactant; and a solvent. ### Claim 23 (depends on 21) The modified acid composition of claim 21, wherein the phosphoric acid derivative is selected from the group consisting of: polyphosphoric acid, Orthophosphoric acid (H3PO4), pyrophosphoric acid (H4P2O7), tripolyphosphoric acid (H5P3O10), tetrapolyphosphoric acid (H6P4O13), trimetaphosphoric acid (H3P3O9), and Phosphoric anhydride (P4O10). ### Claim at position 24 -38. (canceled)