# US 8,770,291 B2 · Hybrid cement set-on-command compositions and methods of use > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,770,291 B2 - Document ID: US8770291B2 - Status: Granted - Kind: B2 - Application number: 12/833,030 - Filed: 2010-07-09 - Published: 2012-01-12 - Granted: 2014-07-08 - Earliest claimed: 2010-07-09 - Assignees: Halliburton Energy Services, Inc. - Applicants: Natasha Shirshova; Alexander Bismarck; Angelika Menner; Gary Funkhouser - Inventors: Natasha Shirshova; Alexander Bismarck; Angelika Menner; Gary Funkhouser - Web page: https://patentgrep.com/patent/US8770291B2 ## CPC - C09K 8/46: containing inorganic binders, e.g. Portland cement - C04B 28/02: containing hydraulic cements other than calcium sulfates - C04B 2103/0046: {added as monomers or as oligomers} - C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE - C04B: LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE {(roofing granules E04D7/005)}; CERAMICS (devitrified glass-ceramics C03C10/00); REFRACTORIES; TREATMENT OF NATURAL STONE ## Abstract A method for isolating a portion of a wellbore including preparing a sealant composition includes an emulsion of an internal phase and an external phase. The sealant composition is placed into the wellbore where one phase sets upon subjecting the sealant composition to a thermal source followed by the setting of the other phase. ## Claims ### Claim 1 A method comprising: placing a sealant composition into a subterranean formation after drilling of a wellbore therein; wherein the sealant composition comprises an emulsion of an internal aqueous phase and an external organic phase, and wherein the internal aqueous phase comprises cement slurry, the cement slurry present in the aqueous phase in an amount of about 75% to about 95% by volume of the aqueous phase; subjecting the sealant composition to a thermal source; wherein subjecting the sealant composition to the thermal source alters the external phase and the internal phase. ### Claim 2 (depends on 1) The method of claim 1, wherein the organic phase comprises a crosslinking agent. ### Claim 3 (depends on 1) The method of claim 1, wherein the internal phase and external phase are immiscible with each other. ### Claim 4 (depends on 1) The method of claim 1, wherein the thermal source is naturally occurring within the wellbore. ### Claim 5 (depends on 1) The method of claim 1, wherein the thermal source emits thermal energy that is induced by technicians in the field. ### Claim 6 (depends on 1) The method of claim 1, further comprising locating a thermal emitter into the wellbore and releasing thermal energy from the emitter. ### Claim 7 (depends on 1) The method of claim 1, wherein the internal phase is present in the emulsion in amounts of from about 50% to about 90% of the total volume of the emulsion. ### Claim 8 (depends on 1) The method of claim 1, wherein the external phase is present in the emulsion in amounts of from about 10% to about 50% of the total volume of the emulsion. ### Claim 9 (depends on 1) The method of claim 1, wherein the emulsion has a volumetric ratio of internal phase to external phase of from 9:1 to 1:1. ### Claim 10 (depends on 1) The method of claim 1, wherein subjecting the sealant composition to the thermal source alters the external phase resulting in an increase in the mechanical strength of the sealant composition. ### Claim 11 (depends on 1) The method of claim 1, wherein the organic phase comprises a thermo-setting resin. ### Claim 12 (depends on 11) The method of claim 11, wherein subjecting the sealant composition to a thermal source initiates the setting of the thermo-setting resin. ### Claim 13 (depends on 1) The method of claim 1, wherein the aqueous phase further comprises a set modifier. ### Claim 14 (depends on 13) The method of claim 13, wherein the set modifier is selected from the group consisting of an accelerator, an oxidizing agent, a set retarder, and combinations thereof. ### Claim 15 (depends on 1) The method of claim 1, wherein the sealant composition further comprises an initiator. ### Claim 16 (depends on 15) The method of claim 15, wherein the initiator is selected to initiate the altering of the external phase at a temperature of at least a portion of the wellbore. ### Claim 17 (depends on 15) The method of claim 15, wherein the initiator is selected from the group consisting of azo-initiators. ### Claim 18 (depends on 15) The method of claim 15, wherein the initiator is selected from the group consisting of peroxy-initiators. ### Claim 19 (depends on 15) The method of claim 15, wherein the initiator is selected from the group consisting of 2,2′-azobis(4-methoxy-2,4-dimethylvaleronitrile), 2,2′-azobis(2,4-dimethylvaleronitrile), 2,2′-azobisisobutyronitrile, dimethyl 2,2′-azobisisobutyrate, 2,2′-azobis(2-methylbutyronitrile), 1,1′-azobis(1-cyclohexanecarbonitrile), 2-(carbamoylazo)isobutyronitrile, 2,2′-azobis(2,4,4-trimethylpentane), 2-phenylazo-2,4-dimethyl-4-methoxyvaleronitrile, 2,2′-azobis(2-methylpropane), persulfates, benzoyl peroxide, tert-butyl peroxide, and combinations thereof. ### Claim 20 (depends on 15) The method of claim 15, wherein the initiator initiates the altering of the external phase. ### Claim 21 (depends on 20) The method of claim 20, wherein the initiator initiates the altering of the external phase upon reaching a temperature threshold. ### Claim 22 (depends on 1) The method of claim 1, wherein the organic phase comprises a monomer. ### Claim 23 (depends on 22) The method of claim 22, wherein the monomer is selected from the group consisting of methyl acrylate, ethyl acrylate, butyl acrylate, methylstyrene, styrene and methyl methacrylate and combinations thereof. ### Claim 24 (depends on 22) The method of claim 22, wherein the monomer is polymerized to form a polymeric component. ### Claim 25 (depends on 24) The method of claim 24, wherein subjecting the sealant composition to a thermal source initiates the polymerization of the monomer. ### Claim 26 (depends on 24) The method of claim 24, wherein the aqueous phase sets within the structure of the polymeric component. ### Claim 27 (depends on 24) The method of claim 24, wherein an initiator initiates the polymerization of the monomer to form a polymeric component. ### Claim 28 A method comprising: placing a sealant composition into a subterranean formation after the drilling of a wellbore therein, the sealant composition comprising an emulsion of an internal phase and an external phase that are immiscible with each other; and subjecting the sealant composition to a thermal source; wherein the internal phase comprises an aqueous phase that comprises cement slurry and the external phase comprises an organic phase that comprises at least one of a monomer or a thermo-setting resin; wherein the cement slurry is present in the aqueous phase in an amount of about 75% to about 95% by volume of the aqueous phase; and wherein subjecting the sealant composition to the thermal source alters the external phase by at least one of polymerizing the monomer or setting the resin, resulting in an increase in the mechanical strength of the sealant composition.