# US 10,479,925 B2 · Use of hexamethylenetetramine intensifier for high temperature emulsified acid system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,479,925 B2 - Document ID: US10479925B2 - Status: Granted - Kind: B2 - Application number: 15/502,761 - Filed: 2014-09-15 - Published: 2017-08-17 - Granted: 2019-11-19 - Earliest claimed: 2014-09-15 - Assignees: Halliburton Energy Services, Inc. - Applicants: Halliburton Energy Services, Inc. - Inventors: Nisha Kaustubh Pandya; Juanita Cassidy - Web page: https://patentgrep.com/patent/US10479925B2 ## CPC - C09K 8/54: Compositions for in situ inhibition of corrosion in boreholes or wells - C09K 8/602: {containing surfactants} - C09K 8/74: combined with additives added for specific purposes - E21B 41/02: in situ inhibition of corrosion in boreholes or wells - E21B 43/25: Methods for stimulating production {(by vibrating earth formations E21B43/003)} - C09K 2208/32: Anticorrosion additives - C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE - E21B: EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS ## Abstract The invention provides a method, composition, and system for inhibiting corrosion where the composition forms an acid-in-oil emulsion comprising hexamethylenetetramine, a corrosion inhibitor; and at least one emulsifier. ## Claims ### Claim 1 A method of treating a subterranean formation comprising: contacting the subterranean formation with a corrosion inhibition composition consisting essentially of: (A) hexamethylenetetramine, (B) a corrosion inhibitor, (C) a combination of emulsifiers, the combination comprising a long chain polyamine and an alkoxylate amine, (D) an acid in an aqueous acid solution, and (E) optionally, a corrosion inhibiting intensifier, wherein the corrosion inhibition composition does not comprise an acetylenic alcohol, and wherein the corrosion inhibition composition is a stable acid-in-oil emulsion at temperatures above about 300° F. ### Claim 2 (depends on 1) The method according to claim 1, wherein the corrosion inhibition composition has the corrosion inhibiting intensifier. ### Claim 3 (depends on 2) The method according to claim 2, wherein the corrosion inhibiting intensifier is potassium iodide, cuprous chloride, or a combination thereof. ### Claim 4 (depends on 1) The method according to claim 1, wherein the corrosion inhibitor has cinnamaldehyde. ### Claim 5 (depends on 4) The method according to claim 4, wherein the corrosion inhibitor has a quaternized quinoline, a quaternized isoquinoline, or a combination thereof. ### Claim 6 (depends on 1) The method according to claim 1 wherein the acid is present in an amount of about 5% to about 35% by weight of the aqueous acid solution in the corrosion inhibition composition. ### Claim 7 (depends on 6) The method according to claim 6, wherein the acid is present in an amount of about 20% to about 30% by weight of the aqueous acid solution in the corrosion inhibition composition. ### Claim 8 (depends on 1) The method according to claim 1, wherein the contacting occurs at a temperature of about 300° F. to about 370° F. ### Claim 9 (depends on 8) The method according to claim 8, wherein the contacting occurs at a temperature of about 325° F. to about 350° F. ### Claim 10 (depends on 1) The method according to claim 1, wherein the hexamethylenetetramine is present in an amount of about 0.5% to about 5% based upon the total weight of the corrosion inhibition composition. ### Claim 11 (depends on 10) The method according to claim 10, wherein the hexamethylenetetramine is present in an amount of about 1% to about 4% based upon the total weight of the corrosion inhibition composition. ### Claim 12 (depends on 11) The method according to claim 11, wherein the hexamethylenetetramine is present in an amount of about 2.5% based upon the total weight of the corrosion inhibition composition. ### Claim 13 (depends on 1) The method according to claim 1, wherein the corrosion inhibitor is present in an amount of about 0.1% to about 5% based upon the total weight of the corrosion inhibition composition. ### Claim 14 (depends on 1) The method according to claim 1, wherein the emulsifier is present in an amount of about 0.1% to about 5% based upon the total weight of the corrosion inhibition composition. ### Claim 15 (depends on 1) The method according to claim 1, wherein the long chain polyamine is PIBA (polyisobutyl amine) and the alkoxylate amine is Ethomeen T/12 (tallow amine ethoxylate). ### Claim 16 (depends on 1) A system configured to perform the method of claim 1, wherein the system comprises: the corrosion inhibition composition; and a drill string disposed in a wellbore, the drill string comprising a drill bit at a subterranean end of the drill string. ### Claim 17 (depends on 16) The system according to claim 16, wherein the system further comprises: an annulus between the drill string and the wellbore; and a pump configured to circulate the corrosion inhibition composition through the drill string. ### Claim 18 (depends on 17) The system according to claim 17, wherein the system further comprises a fluid processing unit configured to process the composition exiting the annulus to generate a cleaned composition for recirculation through the wellbore. ### Claim 19 (depends on 1) A system configured to perform the method of claim 1, wherein the system comprises: the corrosion inhibition composition; a tubular disposed in a wellbore; and a pump configured to pump the corrosion inhibition composition into the subterranean formation. ### Claim 20 A corrosion inhibition composition consisting essentially of: (A) hexamethylenetetramine, (B) a corrosion inhibitor, (C) a combination of emulsifiers, the combination comprising a long chain polyamine and an alkoxylate amine, (D) an aqueous acid, and (E) optionally, a corrosion inhibiting intensifier, wherein the corrosion inhibition composition does not comprise an acetylenic alcohol, and wherein the corrosion inhibition composition is a stable acid-in-oil emulsion at temperatures above about 300° F. ### Claim 21 (depends on 20) The composition according to claim 20, wherein the corrosion inhibition composition has the corrosion inhibiting intensifier. ### Claim 22 (depends on 21) The composition according to claim 21, wherein the corrosion inhibiting intensifier is potassium iodide, cuprous chloride, or a combination thereof. ### Claim 23 (depends on 20) The composition according to claim 20, wherein the corrosion inhibitor has cinnamaldehyde. ### Claim 24 (depends on 23) The composition according to claim 23, wherein the corrosion inhibitor has a quaternized quinoline, a quaternized isoquinoline, or a combination thereof. ### Claim 25 (depends on 20) The corrosion inhibition composition according to claim 20, wherein the long chain polyamine is PIBA (polyisobutyl amine) and the alkoxylate amine is Ethomeen T/12 (tallow amine ethoxylate).