Encapsulated polymers and selective activation thereof

Patent metadata

Field	Value
Publication number	US-10060205-B2
Application number	US-201615387976-A
Country	US
Kind code	B2
Filing date	Dec 22, 2016
Priority date	Dec 22, 2015
Publication date	Aug 28, 2018
Grant date	Aug 28, 2018

Abstract

Wellbore strengthening compositions and methods of use may include a base fluid and a plurality of hydrogel particles or a plurality of core-shell particles suspended in the base fluid. A method of treating a formation may include pumping a wellbore fluid into the formation, where the wellbore fluid includes a base fluid; and a plurality of hydrogel particles or a plurality of core-shell particles suspended in the base fluid.

First claim

What is claimed:

1. A wellbore fluid comprising:
a base fluid; and
a plurality of hydrogel particles or a plurality of core-shell particles suspended in the base fluid, wherein the plurality of hydrogel particles or the plurality of core-shell particles encapsulate a water soluble material.

2. The wellbore fluid of claim I, wherein the base fluid is an oil-based fluid, aqueous-based fluid or an emulsion thereof.

3. The wellbore fluid of claim 1 , wherein the plurality of hydrogel particles or the plurality of core-shell particles are formed from at least a monomer selected from the group of acrylates and acrylate derivatives.

4. The wellbore fluid of claim 3 , wherein the plurality of core-shell particles further comprise an organic solvent.

5. The wellbore fluid of claim 4 , wherein the organic solvent is hexadecane.

6. The wellbore fluid of claim 3 , wherein the plurality of hydrogel particles have an average size ranging from about 15 to about 85 microns.

7. The wellbore fluid of claim 3 , wherein the plurality of core-shell particles have an average size ranging from about 15 microns to about 130 microns.

8. The wellbore fluid of claim 1 , wherein the water soluble material is selected from the group of polyether amines, free water, organic acids and inorganic salts.

9. The wellbore fluid of claim 1 , wherein the encapsulated water soluble material is released by subjecting the plurality of hydrogel particles or the plurality of core-shell particles to shear forces generated by pumping the wellbore fluid into a formation through an opening.

10. A method of treating a formation, the method comprising:
pumping a wellbore fluid into the formation, the wellbore fluid comprising:
a base fluid; and
a plurality of hydrogel particles or a plurality of core-shell particles suspended in the base fluid, wherein the plurality of hydrogel particles or the plurality of core-shell particles encapsulate a water soluble material.

11. The method of claim 10 , wherein the base fluid is an oil-based fluid, an aqueous-based fluid or an emulsion thereof.

12. The method of claim 10 , wherein the plurality of hydrogel particles or the plurality of core-shell particles are formed from at least a monomer selected from the group of acrylates and acrylate derivatives.

13. The method of claim 12 , wherein the plurality of core-shell particles further comprise an organic solvent.

14. The method of claim 13 , wherein the organic solvent is hexadecane.

15. The method of claim 12 , wherein the water soluble material is selected from the group of polyether amines, free water, organic acids and inorganic salts.

16. The method of claim 12 , wherein the plurality of hydrogel particles have an average size ranging from about 15 to about 85 microns.

17. The method of claim 12 , wherein the plurality of core-shell particles have an average size ranging from about 15 microns to about 130 microns.

18. The method of claim 12 , wherein the encapsulated water soluble material is released by subjecting the plurality of hydrogel particles or the plurality of core-shell particles to shear forces generated by pumping the wellbore fluid into a formation through an opening.

19. The method of claim 18 , wherein the shear threes trigger a first release, and a second release is triggered by temperature or time.

Assignees

• Mi Llc

Inventors

• De Stefano Guido
• Price Hoelscher Brandi Katherine
• Young Steven

Classifications

• C09K8/92

  characterised by their form or by the form of their components, e.g. encapsulated material (C09K8/70 takes precedence) · CPC title

• C09K8/72

  Eroding chemicals, e.g. acids · CPC title

• C09K8/516

  characterised by their form or by the form of their components, e.g. encapsulated material · CPC title

• E21B21/003 Primary

  Means for stopping loss of drilling fluid (plastering the borehole wall E21B33/138) · CPC title

• C09K8/035

  Organic additives · CPC title