# US 11,078,403 B2 · Synergistic sulfide scavenging additives for use in oilfield operations > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,078,403 B2 - Document ID: US11078403B2 - Status: Granted - Kind: B2 - Application number: 16/715,338 - Filed: 2019-12-16 - Published: 2020-04-16 - Granted: 2021-08-03 - Earliest claimed: 2019-12-16 - Assignees: Halliburton Energy Services, Inc. - Applicants: Multi-Chem Group, LLC - Inventors: Liu Shi; Funian Zhao; Liangwei Qu; Edward Corrin - Web page: https://patentgrep.com/patent/US11078403B2 ## CPC - C09K 8/54: Compositions for in situ inhibition of corrosion in boreholes or wells - B09C 1/002: {involving in-situ ground water treatment} - B09C 1/08: chemically - C02F 1/66: by neutralisation; pH adjustment (for degassing C02F1/20; using ion-exchange C02F1/42; for flocculation or precipitation of suspended impurities C02F1/52; for removing dissolved compounds C02F1/58) - C02F 1/683: {by addition of complex-forming compounds} - C09K 8/035: Organic additives - E21B 43/00: Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells (applicable only to water E03B) - C02F 2101/101: {Sulfur compounds} - C09K 2208/20: Hydrogen sulfide elimination - C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE - B09C: RECLAMATION OF CONTAMINATED SOIL (gatherers for removing stone or the like from the soil A01B43/00; sterilising soil by steam A01G11/00; removing undesirable matter, e.g. rubbish, from the land E01H15/00) - C02F: TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE (separation in general B01D; special arrangements on waterborne vessels of installations for treating water, waste water or sewage, e.g. for producing fresh water, B63J; adding materials to water to prevent corrosion C23F; treating radioactively-contaminated liquids G21F9/04; regeneration of reactants for recirculation into processes, see the relevant places for the processes) - E21B: EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS ## Abstract Systems, compositions, and methods for synergistic additives for use in the scavenging of sulfur-containing compounds encountered in oilfield operations are provided. In one embodiment, the methods comprise injecting a sulfide scavenging additive that does not comprise a significant amount of an aldehyde into at least a portion of a subterranean formation where one or more sulfur-containing species are present; and injecting a synergistic additive comprising at least one base into at least the portion of the subterranean formation. ## Claims ### Claim 1 A method comprising: injecting a sulfide scavenging additive that is substantially free of aldehyde, the additive comprising at least one compound selected from the group consisting of an acrylate-based compound, an acrylonitrile-based compound, and any combination thereof into at least a portion of a subterranean formation where one or more sulfur-containing species are present; and injecting a synergistic additive comprising at least one weak base into at least the portion of the subterranean formation; wherein at least one of the sulfide scavenging additive or the synergistic additive is injected as a liquid or a mist. ### Claim 2 (depends on 1) The method of claim 1 wherein the synergistic additive catalyzes a reaction of the sulfide scavenging additive and the sulfur-containing species. ### Claim 3 (depends on 1) The method of claim 1 wherein the sulfide scavenging additive reacts with the sulfur-containing species to form products that are at least one of nonhazardous and noncorrosive. ### Claim 4 (depends on 1) The method of claim 1 wherein the synergistic additive reacts with the sulfur-containing species. ### Claim 5 (depends on 4) The method of claim 4 wherein the reaction of the synergistic additive and the sulfur-containing species forms products that are at least one of nonhazardous and noncorrosive. ### Claim 6 (depends on 1) The method of claim 1 wherein the synergistic additive increases a pH level of at least the portion of the subterranean formation. ### Claim 7 (depends on 1) The method of claim 1 wherein the at least one weak base comprises at least one amine. ### Claim 8 (depends on 1) The method of claim 1 wherein the sulfide scavenging additive and the synergistic additive are not mixed prior to injection into the at least the portion of the subterranean formation. ### Claim 9 (depends on 1) The method of claim 1 wherein the sulfide scavenging additive and the synergistic additive are mixed prior to injection into the at least the portion of the subterranean formation. ### Claim 10 (depends on 1) The method of claim 1 wherein the sulfide scavenging additive is injected in an amount of from about 0.1% up to about 50% by weight of the combination of the sulfide scavenging agent and the synergistic additive. ### Claim 11 (depends on 1) The method of claim 1 wherein at least one of the sulfide scavenging additive or the synergistic additive further comprises a surfactant. ### Claim 12 A method comprising: injecting a sulfide scavenging additive that is substantially free of aldehyde, the additive comprising at least one compound selected from the group consisting of an acrylate-based compound, an acrylonitrile-based compound, and any combination thereof into at least a portion of a subterranean formation where one or more sulfur-containing species are present, and injecting a synergistic additive comprising at least one base into at least the portion of the subterranean formation; wherein at least one of the sulfide scavenging additive or the synergistic additive is injected as a liquid or a mist. ### Claim 13 (depends on 12) The method of claim 12 wherein the synergistic additive catalyzes a reaction of the sulfide scavenging additive and the sulfur-containing species. ### Claim 14 (depends on 12) The method of claim 12 wherein the sulfide scavenging additive reacts with the sulfur-containing species to form products that are at least one of nonhazardous and noncorrosive. ### Claim 15 (depends on 12) The method of claim 12 wherein the synergistic additive reacts with the sulfur-containing species. ### Claim 16 (depends on 15) The method of claim 15 wherein the reaction of the synergistic additive and the sulfur-containing species forms products that are at least one of nonhazardous and noncorrosive. ### Claim 17 (depends on 12) The method of claim 12 wherein the sulfide scavenging additive and the synergistic additive are not mixed prior to injection into the at least the portion of the subterranean formation. ### Claim 18 (depends on 12) The method of claim 12 wherein the sulfide scavenging additive and the synergistic additive are mixed prior to injection into the at least the portion of the subterranean formation. ### Claim 19 (depends on 12) The method of claim 12 wherein the sulfide scavenging additive is injected in an amount of from about 0.1% up to about 50% by weight of the combination of the sulfide scavenging agent and the synergistic additive. ### Claim 20 (depends on 12) The method of claim 12 wherein at least one of the sulfide scavenging additive or the synergistic additive further comprises a surfactant.