Amphoteric polymer suspending agent for use in calcium aluminate cement compositions

Patent metadata

Field	Value
Publication number	US-9738821-B2
Application number	US-201615062309-A
Country	US
Kind code	B2
Filing date	Mar 7, 2016
Priority date	Nov 21, 2013
Publication date	Aug 22, 2017
Grant date	Aug 22, 2017

Abstract

A cement composition for use in a well that penetrates a subterranean formation comprises: a calcium aluminate cement or calcium magnesia cement; water; a fluid loss additive; and a suspending agent, wherein the suspending agent is a polymer and wherein the polymer: (A) is amphoteric; (B) has a molecular weight greater than 100,000; and (C) does not increase the fluid loss of the cement composition greater than 15% at a temperature of 145° F. (63° C.) and a pressure differential of 1,000 psi (7 MPa) compared to a cement composition consisting of the cement, the water, and the fluid loss additive. A method of cementing in a subterranean formation comprises: introducing the cement composition into the subterranean formation; and allowing the cement composition to set.

First claim

What is claimed is:

1. A cement composition for use in a well that penetrates a subterranean formation comprising:
a calcium aluminate cement or calcium magnesia cement;
water;
a fluid loss additive; and
a suspending agent, wherein the suspending agent is a polymer and wherein the polymer:
(A) is amphoteric;
(B) has a molecular weight greater than 100,000; and
(C) does not increase a fluid loss of the cement composition greater than 15% at a temperature of 145° F. and a pressure differential of 1,000 psi compared to a test cement composition consisting of the cement, the water, and the fluid loss additive and in the same proportions as the cement composition.

2. The cement composition according to claim 1 , wherein the water is selected from the group consisting of freshwater, brackish water, and saltwater, in any combination thereof in any proportion.

3. The cement composition according to claim 1 , wherein the cement composition has a density in the range of about 9 to about 22 pounds per gallon.

4. The cement composition according to claim 1 , wherein the fluid loss additive is selected from the group consisting of hydroxyethylcellulose and derivatives, styrene-co-butadiene polymers, and combinations thereof.

5. The cement composition according to claim 1 , wherein the fluid loss additive is in a sufficient concentration such that the cement composition has a fluid loss of less than 50 mL/30 minutes at a temperature of 145° F. and a pressure differential of 1,000 psi.

6. The cement composition according to claim 1 , wherein the fluid loss additive is in a concentration in the range of about 0.5 to about 2 gallons per sack of the cement.

7. The cement composition according to claim 1 , wherein the fluid loss additive is in a concentration in the range of about 0.2% to about 2% by weight of the cement.

8. The cement composition according to claim 1 , wherein the suspending agent is amphiprotic.

9. The cement composition according to claim 1 , wherein the suspending agent is a copolymer.

10. The cement composition according to claim 9 , wherein the polymer comprises a first monomer residue and a second monomer residue.

11. The cement composition according to claim 10 , wherein the first monomer residue is cationic and the second monomer residue is anionic.

12. The cement composition according to claim 11 , wherein the first monomer residue is diallyldimethyl ammonium chloride.

13. The cement composition according to claim 11 , wherein the second monomer residue is selected from the group consisting of 2-acrylamido-2-methylpropane sulfonic acid, acrylic acid, methacrylic acid, n,n-dimethyl acrylamide, n-vinylpyrrolidone, and combinations thereof in any proportion.

14. The cement composition according to claim 1 , wherein the suspending agent is compatible with both the cement and the fluid loss additive.

15. The cement composition according to claim 1 , wherein the cement composition has a thickening time of at least 5 hours at a temperature of 145° F. and a pressure of 11,000 psi.

16. The cement composition according to claim 1 , wherein the cement composition has a compressive strength greater than 1,000 psi at a temperature of 160° F. and a pressure of 3,000 psi.

17. The cement composition according to claim 1 , wherein the suspending agent is in a concentration in the range of about 0.5% to about 10% by weight of the cement.

18. The cement composition according to claim 1 , wherein the cement composition has a sag factor between 0.49 and 0.51 at a temperature of 145° F. and a time of 24 hours.

19. The cement composition according to claim 18 , wherein the suspending agent is in a sufficient concentration such that the cement composition has a sag factor between 0.49 and 0.51 at a temperature of 145° F. and a time of 24 hours.

Assignees

• Halliburton Energy Services Inc

Inventors

• Patil Rahul C
• Patil Sandip P
• Singh Sheetal

Classifications

• C09K8/487 Primary

  Fluid loss control additives; Additives for reducing or preventing circulation loss · CPC title

• C09K8/467 Primary

  containing additives for specific purposes · CPC title

• C04B24/2676

  Polystyrenes · CPC title

• C04B24/383

  Cellulose or derivatives thereof · CPC title

• C04B28/105

  Magnesium oxide or magnesium carbonate cements · CPC title