Encapsulated Fluid-Loss Additives for Cement Compositions

• US 20160017688A1
• Filed: 07/21/2014
• Published: 01/21/2016
• Est. Priority Date: 07/21/2014
• Status: Abandoned Application

• Current Assignee: Halliburton Energy Services Incorporated (Halliburton Company)
• Original Assignee: Halliburton Energy Services Incorporated (Halliburton Company)
• Inventors: Chatterji, Jiten, Brenneis, Darrell Chad, Hundt, Gregory Robert
• Application Number:
  US14/463,521
• Publication Number:
  US 20160017688A1
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: B29C 39/003 characterised by the choice of material
• CPC Class Codes: C04B 20/1018 with organic materials pigments or dyes C04B20/1096
• CPC Class Codes: C04B 2103/0059 Graft (co-)polymers
• CPC Class Codes: C04B 2103/46 Water-loss or fluid-loss reducers, hygroscopic or hydrophilic agents, water retention agents
• CPC Class Codes: C04B 24/163 obtained by reactions only involving carbon-to-carbon unsaturated bonds
• CPC Class Codes: C04B 24/383 Cellulose or derivatives thereof
• CPC Class Codes: C04B 28/02 containing hydraulic cements other than calcium sulfates
• CPC Class Codes: C09K 8/487 Fluid loss control additives; Additives for reducing or preventing circulation loss

Abstract

Methods and compositions for cementing in a subterranean formation. An example method of cementing comprises providing a cement composition comprising a hydraulic cement, water, and an encapsulated fluid-loss additive; wherein the encapsulated fluid-loss additive comprises a fluid-loss additive and an encapsulation material; placing the cement composition in a selected location; and allowing the cement composition to set.

Claims

1. A method of cementing comprising:

providing a cement composition comprising;

a hydraulic cement,

water, and

an encapsulated fluid-loss additive;

wherein the encapsulated fluid-loss additive comprises a fluid-loss additive in an amount of about 60% to about 99.9% by weight of the encapsulated fluid-loss additive and an encapsulation material in an amount of about 0.1% to about 40% by weight of the encapsulated fluid-loss additive;

wherein the fluid-loss additive is encapsulated by matrix encapsulation;

placing the cement composition in a selected location; and

allowing the cement composition to set;

wherein the encapsulation material delays release of the fluid-loss additive into the cement composition for a time of about 5 minutes to about 30 minutes.

2. The method of claim 1 wherein the cement composition has a density in a range of from about 4 pounds per gallon to about 20 pounds per gallon, and wherein the water is present in an amount sufficient to form a pumpable slurry.

3. The method of claim 1 wherein the hydraulic cement comprises at least one hydraulic cement selected from the group consisting of Portland cement, pozzolana cement, gypsum cement, high-alumina-content cement, slag cement, silica cement, and any combination thereof.

4. The method of claim 1 wherein the fluid-loss additive comprises a water-soluble polymer selected from the group consisting of hydroxyethyl cellulose, carboxymethylhydroxyethyl cellulose, copolymers of 2-acrylamido-2-methylpropanesulfonic acid and acrylamide or N,N-dimethylacrylamide, graft copolymers comprising a backbone of lignin or lignite and pendant groups comprising at least one member selected from the group consisting of 2-acrylamido-2-methylpropanesulfonic acid, acrylonitrile, and N,N-dimethylacrylamide;

and any combination thereof.

5. The method of claim 1 wherein the encapsulated fluid-loss additive is present in the cement composition in an amount of about 0.1% to about 4% by weight of the cement composition.

6. The method of claim 1 wherein the encapsulation material is selected from the group consisting of paraffin wax, polyethylene wax, stearamide wax, and any combination thereof.

7. The method of claim 1 wherein the encapsulation material is present in the encapsulated fluid-loss additive in an amount of about 0.1% to about 20% by weight of the encapsulated fluid-loss additive.

8. The method of claim 1 wherein the fluid-loss additive is present in the encapsulated fluid-loss additive in an amount of about 80% to about 99.9% by weight of the encapsulated fluid-loss additive.

10. The method of claim 1 wherein the cement composition is used in a primary cementing operation.

11. The method of claim 1 wherein the selected location is in a well bore in a subterranean formation.

9. (canceled)

12-18. -18. (canceled)

19. A cementing system comprising:

a cement composition comprising;

a hydraulic cement,

water, and

an encapsulated fluid-loss additive;

wherein the encapsulated fluid-loss additive comprises a fluid-loss additive in an amount of about 60% to about 99.9% by weight of the encapsulated fluid-loss additive and an encapsulation material in an amount of about 0.1% to about 40% by weight of the encapsulated fluid-loss additive;

wherein the fluid-loss additive is encapsulated by matrix encapsulation; and

wherein the encapsulation material is selected to delay release of the fluid-loss additive into the cement composition for a time of from about 5 minutes to about 30 minutes;

mixing equipment capable of mixing the cement composition; and

pumping equipment capable of delivering the cement composition into a wellbore.

20. The cementing system of claim 19 wherein the fluid-loss additive comprises a water-soluble polymer selected from the group consisting of hydroxyethyl cellulose, carboxymethylhydroxyethyl cellulose, copolymers of 2-acrylamido-2-methylpropanesulfonic acid and acrylamide or N,N-dimethylacrylamide, graft copolymers comprising a backbone of lignin or lignite and pendant groups comprising at least one member selected from the group consisting of 2-acrylamido-2-methylpropanesulfonic acid, acrylonitrile, and N,N-dimethylacrylamide;

xanthan gum, and any combinations thereof.

21. The cementing system of claim 19 wherein the encapsulation material is selected from the group consisting of paraffin wax, polyethylene wax, stearamide wax, and any combinations thereof.

22. (canceled)

23. A method of cementing comprising:

providing a cement composition comprising;

a hydraulic cement,

water, and

an encapsulated fluid-loss additive having a particle size from 20 about microns to about 100 microns;

wherein the encapsulated fluid-loss additive comprises a fluid-loss additive in an amount of about 60% to about 99.9% by weight of the encapsulated fluid-loss additive and an encapsulation material in an amount of about 0.1% to about 40% by weight of the encapsulated fluid-loss additive;

wherein the fluid-loss additive is encapsulated by matrix encapsulation;

placing the cement composition in a subterranean formation; and

allowing the cement composition to set;

wherein the encapsulation material delays release of the fluid-loss additive into the cement composition for a time of about 5 minutes to about 30 minutes.

24. The method of claim 23 wherein the cement composition has a density in a range of from about 4 pounds per gallon to about 20 pounds per gallon, and wherein the water is present in an amount sufficient to form a pumpable slurry.

25. The method of claim 23 wherein the hydraulic cement comprises at least one hydraulic cement selected from the group consisting of Portland cement, pozzolana cement, gypsum cement, high-alumina-content cement, slag cement, silica cement, and any combination thereof.

26. The method of claim 23 wherein the fluid-loss additive comprises a water-soluble polymer selected from the group consisting of hydroxyethyl cellulose, carboxymethylhydroxyethyl cellulose, copolymers of 2-acrylamido-2-methylpropanesulfonic acid and acrylamide or N,N-dimethylacrylamide, graft copolymers comprising a backbone of lignin or lignite and pendant groups comprising at least one member selected from the group consisting of 2-acrylamido-2-methylpropanesulfonic acid, acrylonitrile, and N,N-dimethylacrylamide;

and any combination thereof.

27. The method of claim 23 wherein the encapsulated fluid-loss additive is present in the cement composition in an amount of about 0.1% to about 4% by weight of the cement composition.

28. The method of claim 23 wherein the encapsulation material is selected from the group consisting of paraffin wax, polyethylene wax, stearamide wax, and any combination thereof.

29. The method of claim 23 wherein the encapsulation material is present in the encapsulated fluid-loss additive in an amount of about 0.1% to about 20% by weight of the encapsulated fluid-loss additive.

30. The method of claim 23 wherein the fluid-loss additive is present in the encapsulated fluid-loss additive in an amount of about 80% to about 99.9% by weight of the encapsulated fluid-loss additive.

31. The method of claim 23 wherein the cement composition is used in a primary cementing operation.