PATENTSCOPE will be unavailable a few hours for maintenance reason on Tuesday 19.11.2019 at 4:00 PM CET
Search International and National Patent Collections
Some content of this application is unavailable at the moment.
If this situation persists, please contact us atFeedback&Contact
1. (WO2017138913) NANOCELLULOSE FOAM STABILIZING ADDITIVE
Note: Text based on automatic Optical Character Recognition processes. Please use the PDF version for legal matters

CLAIMS

What is claimed is:

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.

2. 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.

3. 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.

4. 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.

5. 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.

6. The method of claim 1 wherein the nanocellulose foam stabilizing additive comprises individual nanofibrils with a diameter of about 1,000 nanometers or less.

7. The method of claim 1 wherein the nanocellulose foam stabilizing additive comprises individual nanofibrils with a length from about 35 nanometers to about 10000 nanometers.

8. 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 1000 nanometers or greater.

9. The method of claim 1 wherein the nanocellulose foam stabilizing additive is pretreated.

10. The method of claim 1 wherein the selected location is a wellbore annulus in a primary cementing operation.

11. The method of claim 1 wherein the selected location is in a wellbore in a subterranean formation.

12. A foamed cement composition comprising:

a hydraulic cement;

water;

a nanocellulose foam stabilizing additive;

a foaming surfactant, and

a gas.

13. 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.

14. 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.

15. 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.

16. 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.

17. 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.

18. 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 1000 nanometers or greater.

19. A cementing system comprising:

a cement composition comprising:

a hydraulic cement,

water,

a nanocellulose foam stabilizing additive,

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.

20. The cementing system of claim 19 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.