Encapsulated Fluid-Loss Additives for Cement Compositions

Patent metadata

Field	Value
Publication number	US-2016017688-A1
Application number	US-201414463521-A
Country	US
Kind code	A1
Filing date	Jul 21, 2014
Priority date	Jul 21, 2014
Publication date	Jan 21, 2016
Grant date	—

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.

First claim

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.

9 . (canceled)

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.

12 .- 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.

Assignees

• Halliburton Energy Services Inc

Inventors

• Chatterji Jiten
• Brenneis Darrell Chad
• Hundt Gregory Robert

Classifications

• C04B28/02 Primary

  containing hydraulic cements other than calcium sulfates · CPC title

• E21B33/13 Primary

  Methods or devices for cementing, for plugging holes, crevices or the like · CPC title

• B29C39/003 Primary

  characterised by the choice of material · CPC title

• C09K8/44

  containing organic binders only · CPC title

• C09K8/487

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