# US 7,612,021 B2 · Methods and compositions utilizing lost-circulation materials comprising composite particulates > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,612,021 B2 - Document ID: US7612021B2 - Status: Granted - Kind: B2 - Application number: 11/844,926 - Filed: 2007-08-24 - Published: 2009-02-26 - Granted: 2009-11-03 - Earliest claimed: 2007-08-24 - Assignees: Halliburton Energy Services, Inc. - Inventors: Jiten Chatterji; Bobby King; Darrell C. Brenneis - Web page: https://patentgrep.com/patent/US7612021B2 ## CPC - C09K 8/5045: {containing inorganic compounds} - C09K 8/487: Fluid loss control additives; Additives for reducing or preventing circulation loss - C09K 8/506: containing organic compounds - C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE ## Abstract Disclosed embodiments relate to compositions and methods for using a composite particulate comprising a cellulosic fiber and a filler as a lost-circulation material. An example of a method of controlling lost circulation in a subterranean method, comprises contacting a subterranean formation with a fluid comprising a base fluid and a lost circulation material, wherein the lost circulation material comprises a composite particulate, and wherein the composite particulate comprises a cellulosic fiber and a filler. An example method of cementing comprises introducing a cement composition into a well bore penetrating a subterranean formation, wherein the cement compositions comprises a cement, water, and a lost-circulation material, and wherein the lost-circulation material comprises a lost-circulation material, and wherein the lost-circulation material comprises a cellulosic fiber and a filler. Example compositions include lost-circulation materials, treatment fluids and cement compositions. ## Claims ### Claim 1 A method of controlling lost circulation in a subterranean formation method, comprising: introducing a fluid into a well bore penetrating the subterranean formation, wherein the fluid comprises cement, a base fluid and a lost-circulation material, and allowing the fluid to set to form hardened cement, wherein the lost circulation material comprises a composite particulate, wherein the composite particulate comprises a cellulose fiber and a filler, and wherein the lost circulation material reduces and/or prevents loss of the fluid into the subterranean formation. ### Claim 2 (depends on 1) The method of claim 1, wherein the fluid is selected from the group consisting of a drilling fluid, a cement composition, a spacer fluid, a completion fluid, and a workover fluid. ### Claim 3 (depends on 1) The method of claim 1, wherein contacting the subterranean formation with the fluid comprises circulating the fluid in a well bore penetrating the subterranean formation during drilling of the well bore. ### Claim 4 (depends on 1) The method of claim 1, wherein the fluid is introduced into a space between the subterranean formation and a pipe string located in the well bore. ### Claim 5 (depends on 1) The method of claim 1, wherein the cellulosic fiber comprises paper fiber, and wherein the filler comprises kaolin clay and calcium carbonate. ### Claim 6 (depends on 1) The method of claim 1, wherein the cellulosic fiber comprises a paper fiber in an amount from about 47% to about 53% by weight of the composite particulate, and wherein the filler comprises kaolin clay in an amount from about 28% to about 34% by weight of the composite particulate, calcium carbonate in an amount from about 14% to about 20% by weight of the composite particulate, and titanium dioxide in an amount up to about 1% by weight of the composite particulate. ### Claim 7 (depends on 1) The method of claim 1, wherein the cellulosic fiber comprises a paper fiber, and wherein the filler comprises kaolin clay and calcium carbonate. ### Claim 8 (depends on 1) The method of claim 1, wherein the cement comprises a hydraulic cement. ### Claim 9 (depends on 1) The method of claim 1, wherein the cellulosic fiber comprises paper fiber. ### Claim 10 (depends on 1) The method of claim 1, wherein the cellulosic fiber is present in the composite particulate in an amount of at least about 30% by weight of the composite particulate. ### Claim 11 (depends on 1) The method of claim 1, wherein the filler is present in the composite particulate in an amount from about 20% to about 60% by weight of the composite particulate. ### Claim 12 (depends on 1) The method of claim 1, wherein the cellulosic fiber is present in the composite particulate in an amount from about 40% to about 80% by weight of the composite particulate, and wherein the filler is present in an amount from about 20% to about 60% by weight of the composite particulate. ### Claim 13 (depends on 1) The method of claim 1, wherein the filler comprises at least one material selected from the group consisting of kaolin clay, calcium carbonate, a barite, titanium dioxide, a ground thermoset polymer laminate, and combinations thereof. ### Claim 14 (depends on 1) The method of claim 1, wherein the cellulosic fiber comprises a paper fiber, and wherein the filler comprises kaolin clay and calcium carbonate. ### Claim 15 (depends on 1) The method of claim 1, wherein the cellulosic fiber comprise paper fiber, and wherein the filler comprises a ground laminate comprising melamine resin and at least one member selected from the group consisting of paper and fabric. ### Claim 16 (depends on 1) The method of claim 1, wherein the cellulosic fiber comprises a paper fiber in an amount from about 47% to about 53% by weight of the composite particulate, and wherein the filler comprises kaolin clay in an amount from about 28% to about 34% by weight of the composite particulate, calcium carbonate in an amount from about 14% to about 20% by weight of the composite particulate, and titanium dioxide in an amount up to about 1% by weight of the composite particulate. ### Claim 17 (depends on 1) The method of claim 1, wherein the composite particulate has a particle size from about 4 mesh to about 50 mesh and is present in the fluid in an amount from about 4 pounds to about 240 pounds per barrel of the fluid. ### Claim 18 (depends on 1) The method of claim 1, wherein the fluid comprises an additional lost-circulation material in an amount from about 2 pounds to about 120 pounds per barrel of the fluid. ### Claim 19 (depends on 1) The method of claim 1, wherein the fluid comprises at least one lost-circulation material selected from the group consisting ground coal, petroleum coke, sized calcium carbonate, an asphaltene, perlite, cellophane, vitrified shale, a plastic material, a ground tire, a ground oyster shell, a ground nut hull, a flake, a fiber, a ground thermoset polymer laminate, and combinations thereof. ### Claim 20 A method of cementing, comprising: introducing a cement composition into a well bore penetrating a subterranean formation, wherein the cement composition comprises a cement, water, and a lost-circulation material wherein the lost circulation material comprises a particulate, and wherein the composite particulate comprises a cellulose fiber and a filler; and allowing the cement composition to set in the well bore. ### Claim 21 (depends on 20) The method of claim 20, wherein the cellulose fiber is present in the composite particulate in an amount from about 40% to about 80% by weight of the composite particulate, and wherein the filler is present in an amount from about 20% to about 60% by weight of the composite particulate. ### Claim 22 (depends on 20) The method of claim 20, wherein the cellulose fiber comprise a paper fiber, and wherein the filler comprises a ground laminate comprising melamine resin and at least one member selected from the group consisting of paper and fabric. ### Claim 23 (depends on 22) The method of claim 22, wherein the cellulose fiber comprises a paper fiber, and wherein the filler comprises kaolin clay and calcium carbonate.