Methods of making cement slurries and cured cement and use thereof

Patent metadata

Field	Value
Publication number	US-11643587-B2
Application number	US-202016993687-A
Country	US
Kind code	B2
Filing date	Aug 14, 2020
Priority date	Aug 16, 2019
Publication date	May 9, 2023
Grant date	May 9, 2023

Abstract

Cured cements, cement slurries, and methods of making cured cement and methods of using cement slurries are provided. The method of making a modified cement slurry includes adding particles comprising carbon nanotube sponges disposed on sacrificial templates to a cement slurry to form the modified cement slurry and allowing the sacrificial templates to disintegrate, thereby leaving the carbon nanotube sponges dispersed throughout the modified cement slurry.

First claim

What is claimed is:

1. A method of making a modified cement slurry comprising:
adding particles comprising carbon nanotube sponges disposed on sacrificial templates to a cement slurry to form the modified cement slurry; and
allowing the sacrificial templates to disintegrate, thereby leaving the carbon nanotube sponges dispersed throughout the modified cement slurry.

2. The method of claim 1 , further comprising treating the particles with an aqueous surfactant and freeze drying the treated particles prior to adding the particles to the cement slurry.

3. The method of claim 1 , further comprising adding at least one of a dispersing agent or a surfactant to the cement slurry prior to adding the particles to the cement slurry.

4. The method of claim 3 , in which the dispersing agent comprises polycarboxylate ether.

5. The method of claim 3 , in which the surfactant comprises at least one of anionic surfactants, cationic surfactants, amphoteric surfactants, zwitterionic surfactants, nonionic surfactants, or combinations of these.

6. The method of claim 1 , in which the sacrificial templates comprise at least one of silica, polylactic acid, glass, and polygluconic acid.

7. The method of claim 1 , in which the sacrificial templates comprise silica.

8. The method of claim 1 , in which the carbon nanotube sponges are functionalized with carbon nanotubes.

9. The method of claim 1 , in which the carbon nanotube sponges store electric energy.

10. The method of claim 1 , in which the carbon nanotube sponges are randomly dispersed throughout the cement slurry.

11. The method of claim 1 , in which the cement slurry has a pH of greater than 7 and disintegrates the sacrificial templates through acid etching.

12. The method of claim 1 , in which the cement slurry is hydraulic.

13. The method of claim 1 , in which the cement slurry is non-hydraulic.

14. The method of claim 1 , in which the cement slurry comprises at least one of Portland cement, siliceous fly ash, calcareous fly ash, slag cement, silica fume, calcium hydroxide, silicates, belite (Ca 2 SiO 5 ), alite (Ca 3 SiO 4 ), tricalcium aluminate (Ca 3 Al 2 O 6 ), tetracalcium aluminoferrite (Ca 4 Al 2 Fe 2 O 10 ), brownmillerite (4CaO.Al 2 O 3 .Fe 2 O 3 ), gypsum (CaSO 4 .2H 2 O), sodium oxide, potassium oxide, limestone, lime (calcium oxide), hexavalent chromium, calcium aluminate, and combinations of these.

15. A method of making a modified cement slurry comprising:
synthesizing carbon nanotube sponges via chemical vapor deposition on sacrificial templates to form particles;
adding the particles to a cement slurry to form the modified cement slurry; and
allowing the sacrificial templates to disintegrate, thereby leaving the carbon nanotube sponges dispersed throughout the modified cement slurry.

16. The method of claim 15 , further comprising treating the particles with an aqueous surfactant and freeze drying the treated particles prior to adding the particles to the cement slurry.

17. The method of claim 15 , further comprising adding at least one of a dispersing agent or a surfactant to the cement slurry prior to adding the particles to the cement slurry.

18. The method of claim 17 , in which the dispersing agent comprises polycarboxylate ether.

19. The method of claim 15 , in which the sacrificial templates comprise at least one of silica, polylactic acid, glass, and polygluconic acid.

20. The method of claim 15 , in which the cement slurry has a pH of greater than 7 and disintegrates the sacrificial templates through acid etching.

Assignees

• Saudi Arabian Oil Co

Inventors

• Boul Peter J
• Santra Ashok

Classifications

• C09K8/426

  for plugging · CPC title

• C04B28/04

  Portland cements · CPC title

• C04B14/026

  of particular shape, e.g. nanotubes · CPC title

• Y02W30/91

  Use of waste materials as fillers for mortars or concrete · CPC title

• C09K8/467 Primary

  containing additives for specific purposes · CPC title