Mitigation of transient gels in cements

Patent metadata

Field	Value
Publication number	US-12264280-B2
Application number	US-202418443895-A
Country	US
Kind code	B2
Filing date	Feb 16, 2024
Priority date	Aug 22, 2022
Publication date	Apr 1, 2025
Grant date	Apr 1, 2025

Abstract

A cement slurry including graphene, a cement, and water; the graphene comprises bioderived renewable graphene (BRG). The cement slurry has reduced transient gel formation relative to a same cement slurry absent the graphene. Methods of mitigating transient gels in cement are also provided.

First claim

What is claimed is:

1. A cement slurry comprising:
graphene, wherein the graphene comprises bioderived renewable graphene (BRG), wherein the BRG comprises nanosheets comprising greater than 90 weight percent carbon, and wherein the nanosheets have a surface area of at least 2000 m 2 /g and up to 2496 m 2 /g, a pore volume of at least 3 cc/g and up to 5.0 cc/g, or a combination thereof;
a cement; and
water,
wherein the cement slurry is positioned in a wellbore and the cement slurry, when unset, has reduced transient gel formation relative to a same cement slurry, when unset, absent the graphene.

2. The cement slurry of claim 1 comprising from about 0.01 to about 20 percent BRG by weight of cement (% BRG bwoc).

3. The cement slurry of claim 1 , wherein the BRG comprises graphene derived from a plant.

4. The cement slurry of claim 3 , wherein the plant comprises cassava.

5. The cement slurry of claim 4 , wherein a yield point of the cement slurry, when unset, as measured according to API 10B-2 is reduced by at least 10% relative to the same cement slurry, when unset, absent the graphene.

6. The cement slurry of claim 5 , wherein an apparent viscosity at 100 RPM (AVIS 100 ) of the cement slurry, when unset, as measured according to API 10B-2 is reduced by at least 10% relative to the same cement slurry, when unset, absent the graphene.

7. The cement slurry of claim 6 , wherein the thixotropic rate of the cement slurry, when unset, measured as the ten minute yield point divided by ten is reduced by at least 5% relative to the thixotropic rate of the same cement slurry, when unset, absent the graphene.

8. The cement slurry of claim 1 , wherein the BRG comprises graphene with a fused sheet-like morphology.

9. The cement slurry of claim 1 , wherein the cement comprises a Portland cement.

10. The cement slurry of claim 9 , wherein the cement comprises a Type I, IA, II, IIA, III, IIIA, IV, V, VI, or VII Portland cement, a subtype thereof, or a combination thereof.

11. The cement slurry of claim 1 , wherein the cement comprises a construction grade cement, wherein a construction grade cement is a cement comprising greater than about 1 weight percent (wt %) calcium aluminate.

12. The cement slurry of claim 1 , wherein the cement comprises an aluminate content in a range of from about 1 to about 30 percent aluminate by mass of cement.

13. The cement slurry of claim 1 , wherein a yield point of the cement slurry, when unset, as measured according to API 10B-2 is reduced by at least 10% relative to the same cement slurry, when unset, absent the graphene.

14. The cement slurry of claim 13 , wherein an apparent viscosity at 100 RPM (AVIS 100 ) of the cement slurry, when unset, as measured according to API 10B-2 is reduced by at least 10% relative to the same cement slurry, when unset, absent the graphene.

15. The cement slurry of claim 14 , wherein the thixotropic rate of the cement slurry, when unset, measured as the ten minute yield point divided by ten is reduced by at least 5% relative to the thixotropic rate of the same cement slurry, when unset, absent the graphene.

16. The cement slurry of claim 1 , wherein an apparent viscosity at 100 RPM (AVIS 100 ) of the cement slurry, when unset, as measured according to API 10B-2 is reduced by at least 10% relative to the same cement slurry, when unset, absent the graphene.

17. The cement slurry of claim 1 , wherein a thixotropic rate of the cement slurry, when unset, measured as the ten minute yield point divided by ten, is less than a thixotropic rate of the same cement slurry, when unset, absent the graphene.

18. The cement slurry of claim 17 , wherein the thixotropic rate of the cement slurry, when unset, is reduced by at least 5% relative to the thixotropic rate of the same cement slurry, when unset, absent the graphene.

19. The cement slurry of claim 1 , wherein the BRG is a product of:
combining a renewable carbohydrate material with a dehydration solvent to aid hydrolysis;
removing glycosidic linkages and water via chemical and/or thermal activation to provide an intermediate fused carbon material; and
thermochemically activating the intermediate fused carbon material to exfoliate intercalated carbon layers of the intermediate fused carbon material and to initiate chemical bonding of carbon atoms to form the BRG, wherein the BRG comprises a network of sp2 bonded carbon nanosheets.

20. The cement slurry of claim 19 , wherein the BRG comprises graphene derived from cassava.

Assignees

• Halliburton Energy Services Inc

Inventors

• Pisklak Thomas Jason
• Lewis Samuel J
• Pineda Claudia

Classifications

• C04B14/024

  Graphite · CPC title

• C09K8/467 Primary

  containing additives for specific purposes · CPC title

• E21B33/13

  Methods or devices for cementing, for plugging holes, crevices or the like · CPC title

• C01B32/182

  Graphene · CPC title

• C04B28/02

  containing hydraulic cements other than calcium sulfates · CPC title