Use of synthetic smectite in set-delayed cement compositions comprising pumice

Patent metadata

Field	Value
Publication number	US-10087358-B2
Application number	US-201715415558-A
Country	US
Kind code	B2
Filing date	Jan 25, 2017
Priority date	Mar 9, 2012
Publication date	Oct 2, 2018
Grant date	Oct 2, 2018

Abstract

Disclosed herein are cement compositions using set-delayed cement compositions in subterranean formations. The composition may comprise a set-delayed cement composition comprising pumice, hydrated lime, a cement set retarder, a synthetic smectite, and water.

First claim

What is claimed is:

1. A method of making a reduced density set-delayed cement composition for cementing in a subterranean formation comprising, the method comprising:
preparing a set-delayed cement composition comprising:
pumice;
hydrated lime;
a cement set retarder; and
water;

wherein the set-delayed cement composition has an initial density of from about 13 lb/gal to about 20 lb/gal and wherein the set-delayed cement composition is capable of remaining in a pumpable fluid state for at least about 7 days; and
adding water and synthetic smectite to the set-delayed cement composition to reduce the density of the set-delayed cement composition by at least 1 lb/gal to produce the reduced density set-delayed cement composition, wherein the synthetic smectite is added in an amount sufficient to stabilize the reduced density set-delayed cement composition.

2. The method of claim 1 wherein the pumice has a mean particle size in a range of about 10 micron to about 25 microns.

3. The method of claim 1 wherein the pumice and the hydrated lime are present in a weight ratio of pumice to hydrated lime of about 10:1 to about 1:1.

4. The method of claim 1 wherein the hydrated lime is provided as calcium oxide.

5. The method of claim 1 wherein the cement set retarder comprises at least one retarder selected from the group consisting of a phosphonic acid, a phosphonic acid derivative, a lignosulfonate, a salt, an organic acid, a carboxymethylated hydroxyethylated cellulose, a synthetic co- or ter-polymer comprising sulfonate and carboxylic acid groups, a borate compound, and any mixture thereof.

6. The method of claim 1 wherein the set retarder is present in an amount of about about 0.01% to about 5% by weight of the water.

7. The method of claim 1 wherein the synthetic smectite has a thickness of less than about 100 nm and lateral dimensions of in a range of about 1 to about 100 nm, the synthetic smectite being present in an amount of about 0.01% to about 5% by weight of the added water.

8. The method of claim 1 wherein the water is present in the set-delayed cement composition in an amount in the range of from about 33% to about 200% by weight of the pumice.

9. The method of claim 1 wherein the set-delayed cement composition further comprises carbon fibers, wherein the carbon fibers are present in an amount from about 0.01% to about 5% by weight of the pumice.

10. The method of claim 1 wherein the set-delayed cement composition further comprises polyethyleneimine.

11. The method of claim 1 wherein the set-delayed cement composition further comprises a dispersant and wherein the dispersant comprises at least one dispersant selected from the group consisting of a sulfonated-formaldehyde-based dispersant, a polycarboxylated ether dispersant, and any combination thereof.

12. The method of claim 1 further comprising a viscosifier wherein the viscosifier is present in an amount of about 0.01% to about 0.5% by weight of the pumice.

13. The method of claim 1 further comprising a cement set activator wherein the cement set activator is selected from the group consisting of zeolites, amines, silicates, zinc formate; calcium acetate; Groups IA and IIA hydroxides, monovalent salts, divalent salts, nanosilica, polyphosphates; and combinations thereof.

14. The method of claim 1 further comprising an activator comprising a polyphosphate and a monovalent salt.

15. The method of claim 14 wherein the polyphosphate comprises a polymeric metaphosphate salt.

16. The method of claim 1 wherein the synthetic smectite is provided as at least one of a dry powder and a mixture with water.

17. The method of claim 1 further comprising storing the set-delayed cement composition for a time period of at least one day before the step of adding the water and the synthetic smecite.

18. A method of preparing a set-delayed cement composition for cementing in a subterranean formation comprising, the method comprising:
preparing a set-delayed cement composition comprising:
pumice;
hydrated lime;
a cement set retarder;
a mechanical property enhancing additive comprising carbon fibers; and
water;

wherein the set-delayed cement composition is capable of remaining in a pumpable fluid state for a time period of at least about 7 days and wherein the set-delayed cement composition has an initial density of from about 13 lb/gal to about 20 lb/gal: and
adding a liquid additive comprising water and synthetic smectite to the set-delayed cement composition to reduce the density of the set-delayed cement composition by at least 1 lb/gal.

19. The method of claim 18 wherein the carbon fibers are present in an amount from about 0.01% to about 5% by weight of the pumice.

20. The method of claim 18 wherein the set-delayed cement composition further comprises a dispersant and wherein the dispersant comprises at least one dispersant selected from the group consisting of a sulfonated-formaldehyde-based dispersant, a polycarboxylated ether dispersant, and any combination thereof.

Assignees

• Halliburton Energy Services Inc

Inventors

• Boul Peter James
• Agapiou Kyriacos
• Pisklak Thomas Jason
• Morgan Ronnie Glen
• Brothers Lance Everett
• Otieno Pauline Akinyi

Classifications

• C04B28/18

  containing mixtures of the silica-lime type · CPC title

• C04B40/0658

  Retarder inhibited mortars activated by the addition of accelerators or retarder-neutralising agents · CPC title

• E21B33/14

  for cementing casings into boreholes · CPC title

• C04B14/386

  Carbon (carbon nanotubes C04B14/026) · CPC title

• C09K8/467 Primary

  containing additives for specific purposes · CPC title