Cement set activators for set-delayed cement compositions and associated methods

Patent metadata

Field	Value
Publication number	US-9371712-B2
Application number	US-201314090494-A
Country	US
Kind code	B2
Filing date	Nov 26, 2013
Priority date	Mar 9, 2012
Publication date	Jun 21, 2016
Grant date	Jun 21, 2016

Abstract

Disclosed herein are cement compositions and methods of using set-delayed cement compositions in subterranean formations. In one embodiment, a method of cementing in a subterranean formation is described. The method may comprise providing a set-delayed cement composition comprising water, pumice, hydrated lime, and a set retarder; activating the set-delayed cement composition with a liquid additive to produce an activated cement composition, wherein the liquid additive comprises a monovalent salt, a polyphosphate, a dispersant, and water; and allowing the activated cement composition to set.

First claim

What is claimed is:

1. A method of cementing comprising:
providing a set-delayed cement composition comprising water, pumice, hydrated lime, and a set retarder;
activating the set-delayed cement composition with a liquid additive to produce an activated cement composition, wherein the liquid additive comprises a monovalent salt, a polyphosphate, a dispersant, and water; and
allowing the activated cement composition to set.

2. The method of claim 1 wherein the liquid additive is added to the set-delayed cement composition in an amount of about 1% to about 20% by weight of the set-delayed cement composition.

3. The method of claim 1 wherein the monovalent salt is present in the liquid additive in an amount of about 0.1% to about 30% by weight of the liquid additive, wherein the polyphosphate is present in the liquid additive in an amount of about 0.1% to about 30% by weight of the liquid additive, wherein the dispersant is present in the liquid additive in an amount of about 0.1% to about 90% by weight of the liquid additive, and wherein the water is present in the liquid additive in an amount of about 50% to about 90% by weight of the liquid additive.

4. The method of claim 1 wherein the polyphosphate comprises sodium hexametaphosphate.

5. The method of claim 1 wherein the monovalent salt comprises sodium sulfate.

6. The method of claim 1 wherein the dispersant comprises a polycarboxylated ether.

7. The method of claim 1 wherein the ratio of the monovalent salt to the polyphosphate is from about 5:1 to about 1:25.

8. The method of claim 1 wherein the polyphosphate comprises sodium hexametaphosphate, the monovalent salt comprises sodium sulfate, and the dispersant comprises a polycarboxylated ether.

9. The method of claim 1 wherein the set-delayed cement composition remains in a pumpable fluid state for a time period of about 4 hours to about 6 hours after activation.

10. The method of claim 1 further comprising storing the set-delayed cement composition for a period of about 1 day or longer.

11. The method of claim 1 further comprising introducing the activated cement composition into a subterranean formation.

12. The method of claim 1 further comprising pumping the activated cement composition through a conduit, through a casing shoe, and into a wellbore annulus.

13. A method of cementing comprising:
providing a set-delayed cement composition comprising:
water,
pumice,
hydrated lime, and
a set retarder; and

providing a liquid additive for activation of the set-delayed cement composition comprising:
water,
a monovalent salt,
a polyphosphate,
a dispersant; and

allowing the set-delayed cement composition to remain in a storage vessel for about one day or more;
activating the set-delayed cement composition with the liquid additive to produce an activated cement composition by combining the liquid additive with the set delayed cement composition in mixing equipment;
pumping the activated cement composition through a conduit into a wellbore;
allowing the activated cement composition to set.

14. The cementing method of claim 13 wherein the polyphosphate comprises sodium hexametaphosphate, the monovalent salt comprises sodium sulfate, and the dispersant comprises a polycarboxylated ether.

Assignees

• Halliburton Energy Services Inc

Inventors

• Boul Peter James
• Pisklak Thomas Jason
• Lewis Samuel J
• Agapiou Kyriacos
• Brothers Lance Everett
• Otieno Pauline Akinyi
• Morgan Ronnie Glen
• Adams Baya
• Harris Cody Glenn

Classifications

• E21B33/14

  for cementing casings into boreholes · CPC title

• E21B33/138

  Plastering the borehole wall; Injecting into the formation · CPC title

• C09K8/428

  for squeeze cementing, e.g. for repairing · CPC title

• C04B40/0658

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

• C04B14/062

  Microsilica, e.g. colloïdal silica (preparing microsilica slurries or suspensions C04B18/148) · CPC title