Defoaming compositions and processes for cementing applications

Patent metadata

Field	Value
Publication number	US-9475975-B2
Application number	US-201113036397-A
Country	US
Kind code	B2
Filing date	Feb 28, 2011
Priority date	Feb 28, 2011
Publication date	Oct 25, 2016
Grant date	Oct 25, 2016

Abstract

Cement compositions and processes for reducing air entrainment in a cement composition generally include mixing a hydraulic cement with a defoamer composition including an organic acid ester of a polyoxyethylene-polyoxypropylene block copolymer.

First claim

What is claimed is:

1. A process for reducing air entrainment in a cement composition, the process comprising:
adding a defoaming composition to a cement composition, wherein the defoaming composition comprises an organic acid ester of a polyoxyethylene-polyoxypropylene block copolymer; and
reducing air entrainment in the cement composition relative to a cement composition without the defoaming composition; wherein the polyoxyethylene-polyoxypropylene organic acid ester is a diesterification reaction product of a polyoxyethylene-polyoxypropylene block copolymer and oleic acid; and
wherein the organic acid ester of the polyoxyethylene-polyoxypropylene block copolymer is of the general structure:

wherein R is (CH 2 ) 7 CH═CH(CH 2 ) 7 CH 3 ;
a is 2 to 8; and
b is 16 to 67.

2. The process of claim 1 , wherein the organic acid ester of the polyoxyethylene-polyoxypropylene block copolymer has an average molecular weight of 1650 to 5000 Daltons.

3. The process of claim 1 , wherein the adding the defoaming composition to the cement composition is at 0.01 to 1% by weight of the cement.

4. The process of claim 1 , further comprising adding hydrophobic silica to the cement composition.

5. The process of claim 4 , wherein a weight ratio of the hydrophobic silica to the acid ester of the polyoxyethylene-polyoxypropylene block copolymer is between 0.1 to 10 weight percent.

6. The process of claim 4 , wherein the hydrophobic silica is hydrophobized silica fume or precipitated silica or a mixture thereof.

7. A cement composition comprising:
hydraulic cement;
water; and
a defoaming composition comprising an organic acid ester of a polyoxyethylene-polyoxypropylene block copolymer; wherein the polyoxyethylene-polyoxypropylene organic acid ester is a diesterification reaction product of a polyoxyethylene-polyoxypropylene block copolymer and oleic acid; and wherein the organic acid ester of the polyoxyethylene-polyoxypropylene block copolymer is of the general structure:

wherein R is (CH 2 ) 7 CH═CH(CH 2 ) 7 CH 3 ;
a is 2 to 8; and
b is 16 to 67.

8. The cement composition of claim 7 , wherein the organic acid ester of the polyoxyethylene-polyoxypropylene block copolymer has an average molecular weight of 1650 to 5000 Daltons.

9. The cement composition of claim 7 , further comprising hydrophobic silica.

10. The cement composition of claim 9 , wherein the hydrophobic silica is at a weight ratio to the acid ester of the polyoxyethylene-polyoxypropylene block copolymer between 0.1 to 10 weight percent.

11. The cement composition of claim 9 , wherein the hydrophobic silica is hydrophobized silica fume or precipitated silica or a mixture thereof.

12. The cement composition of claim 7 , wherein the defoaming composition is at 0.01 to 1% by weight of the hydraulic cement.

13. The cement composition of claim 7 , wherein the polyoxyethylene-polyoxypropylene organic acid ester has an average molecular weight of about 1665, about 2000, about 2565, about 3315, about 4365, or about 4965 Daltons.

14. A method of cementing a subterranean formation, comprising:
displacing a cement composition into the subterranean formation, the cement composition comprising hydraulic cement, water; and a defoaming composition comprising an organic acid ester of a polyoxyethylene-polyoxypropylene block copolymer; and
allowing the cement to set;
wherein the polyoxyethylene-polyoxypropylene organic acid ester is a diesterification reaction product of a polyoxyethylene-polyoxypropylene block copolymer and oleic acid; and wherein the organic acid ester of the polyoxyethylene-polyoxypropylene block copolymer is of the general structure:

wherein R is (CH 2 ) 7 CH═CH(CH 2 ) 7 CH 3 ;
a is 2 to 8; and
b is 16 to 67.

15. The method of claim 14 , wherein the displacing the cement composition comprises pumping the cement composition into an annular space between walls of a well bore and a casing during a primary or a remedial cementing operation.

16. The method of claim 14 , wherein the hydraulic cement is foamed and the defoaming composition is added to the hydraulic cement in an amount effective to break the foam, thereby reducing gas entrainment in the hydraulic cement.

17. The method of claim 14 , wherein the defoaming composition is at 0.01 to 1% by weight of the hydraulic cement.

Assignees

• Mahmoudkhani Amir H
• Wilson Robert E
• Bava Luciana
• Rocker Jacob A
• Kemira Oyj

Inventors

• Mahmoudkhani Amir H
• Wilson Robert E
• Bava Luciana
• Rocker Jacob A

Classifications

• C04B24/32

  Polyethers, e.g. alkylphenol polyglycolether · CPC title

• C04B2103/0041

  Non-polymeric ingredients chosen for their physico-chemical characteristics · CPC title

• C04B2103/50

  Defoamers, air detrainers · CPC title

• C09K8/035

  Organic additives · CPC title

• C04B28/02

  containing hydraulic cements other than calcium sulfates · CPC title