# US 10,766,813 B2 · Nanocellulose foam stabilizing additive > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,766,813 B2 - Document ID: US10766813B2 - Status: Granted - Kind: B2 - Application number: 16/062,584 - Filed: 2016-02-08 - Published: 2018-12-20 - Granted: 2020-09-08 - Earliest claimed: 2016-02-08 - Assignees: Halliburton Energy Services, Inc. - Applicants: Halliburton Energy Services, Inc. - Inventors: William Cecil Pearl, Jr.; Samuel J. Lewis; Jeffery Dwane Karcher - Web page: https://patentgrep.com/patent/US10766813B2 ## CPC - C04B 20/006: {Microfibres; Nanofibres} - C04B 18/241: {Paper, e.g. waste paper; Paper pulp} - C04B 18/26: Wood, e.g. sawdust, wood shavings - C04B 28/04: Portland cements - C04B 28/06: Aluminous cements (monolithic refractories or refractory mortars C04B35/66) - C04B 28/08: Slag cements - C04B 38/10: by using foaming agents (C04B38/02 takes precedence){or by using mechanical means, e.g. adding preformed foam} - C09K 8/467: containing additives for specific purposes - C09K 8/473: Density reducing additives, e.g. for obtaining foamed cement compositions - C04B 2103/40: Surface-active agents, dispersants - C04B 2103/48: Foam stabilisers - C09K 2208/10: Nanoparticle-containing well treatment fluids - Y02W 30/91: Use of waste materials as fillers for mortars or concrete - 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 - C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE - Y02W: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT ## Abstract A variety of systems, methods and compositions are disclosed, including, in one method, providing a foamed cement composition comprising a hydraulic cement, water, a foaming surfactant, a gas, and a nanocellulose foam stabilizing additive; placing the foamed cement composition in a selected location; and allowing the foamed cement composition to set. ## Claims ### Claim 1 A method of cementing comprising: providing a foamed cement composition comprising: a hydraulic cement, water, a foaming surfactant, a gas, and a nanocellulose foam stabilizing additive; placing the foamed cement composition in a selected location; and allowing the foamed cement composition to set, wherein the nanocellulose foam stabilizing additive comprises a nanofibril cellulose. ### Claim 2 (depends on 1) The method of claim 1 wherein the foamed cement composition has a density in a range of from about 4 pounds per gallon to about 16 pounds per gallon, and wherein the water is present in an amount sufficient to form a pumpable slurry. ### Claim 3 (depends on 1) The method of claim 1 wherein the hydraulic cement comprises at least one hydraulic cement selected from the group consisting of Portland cement, pozzolana cement, gypsum cement, high-alumina-content cement, slag cement, silica cement, and any combination thereof. ### Claim 4 (depends on 1) The method of claim 1 wherein the nanocellulose foam stabilizing additive comprises nanofibril cellulose derived from at least one nanocellulose fiber selected from the group consisting of bacteria, wood, bleached kraft pulp, bleached sulfite pulp, sugar beet pulp, wheat straw, soy hulls, sisal, bagasse, palm trees, ramie, carrots, luffa cylindrica and any combination thereof. ### Claim 5 (depends on 1) The method of claim 1 wherein the nanocellulose foam stabilizing additive is present in the cement composition in an amount of about 0.01% to about 10% by weight of the cement. ### Claim 6 (depends on 1) The method of claim 1 wherein the nanocellulose foam stabilizing additive comprises individual nanofibrils with a diameter of about 1,000 nanometers or less. ### Claim 7 (depends on 1) The method of claim 1 wherein the nanocellulose foam stabilizing additive comprises individual nanofibrils with a length from about 35 nanometers to about 10,000 nanometers. ### Claim 8 (depends on 1) The method of claim 1 wherein the nanocellulose foam stabilizing additive comprises individual nanofibrils with a diameter of about 100 nanometers or less and a length of about 1,000 nanometers or greater. ### Claim 9 (depends on 1) The method of claim 1 wherein the nanocellulose foam stabilizing additive is pretreated. ### Claim 10 (depends on 1) The method of claim 1 wherein the selected location is a wellbore annulus in a primary cementing operation. ### Claim 11 (depends on 1) The method of claim 1 wherein the selected location is in a wellbore in a subterranean formation. ### Claim 12 A foamed cement composition comprising: a hydraulic cement, water, a nanocellulose foam stabilizing additive, a foaming surfactant, and a gas; wherein the nanocellulose foam stabilizing additive comprises a nanofibril cellulose. ### Claim 13 (depends on 12) The foamed cement composition of claim 12 wherein the foamed cement composition has a density in a range of from about 4 pounds per gallon to about 16 pounds per gallon, and wherein the water is present in an amount sufficient to form a pumpable slurry. ### Claim 14 (depends on 12) The foamed cement composition of claim 12 wherein the hydraulic cement comprises at least one hydraulic cement selected from the group consisting of Portland cement, pozzolana cement, gypsum cement, high-alumina-content cement, slag cement, silica cement, and any combination thereof. ### Claim 15 (depends on 12) The foamed cement composition of claim 12 wherein the nanocellulose foam stabilizing additive comprises nanofibril cellulose derived from at least one nanocellulose fiber selected from the group consisting of bacteria, wood, bleached kraft pulp, bleached sulfite pulp, sugar beet pulp, wheat straw, soy hulls, sisal, bagasse, palm trees, ramie, carrots, luffa cylindrica and any combination thereof. ### Claim 16 (depends on 12) The foamed cement composition of claim 12 wherein the nanocellulose foam stabilizing additive is present in the cement composition in an amount of about 0.01% to about 10% by weight of the cement. ### Claim 17 (depends on 12) The foamed cement composition of claim 12 wherein the nanocellulose foam stabilizing additive comprises individual nanofibrils with a diameter of about 1,000 nanometers or less. ### Claim 18 (depends on 12) The foamed cement composition of claim 12 wherein the nanocellulose foam stabilizing additive comprises individual nanofibrils with a diameter of about 100 nanometers or less and a length of about 1,000 nanometers or greater. ### Claim 19 A cementing system comprising: a cement composition comprising: a hydraulic cement, water, a nanocellulose foam stabilizing additive, wherein the nanocellulose foam stabilizing additive comprises a nanofibril cellulose, a foaming surfactant, and a gas; mixing equipment capable of mixing the cement composition; and pumping equipment capable of delivering the cement composition into a wellbore. ### Claim 20 (depends on 19) The cementing system of claim 19 wherein the nanofibril cellulose is derived from at least one nanocellulose fiber selected from the group consisting of bacteria, wood, bleached kraft pulp, bleached sulfite pulp, sugar beet pulp, wheat straw, soy hulls, sisal, bagasse, palm trees, ramie, carrots, luffa cylindrica and any combination thereof.