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1. WO2011062884 - REMBLAYEUSES GONFLABLES À GRADUATION DE FONCTIONNALITÉ

Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

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Claims

What is claimed is:

1. A swellable packer, comprising:

a tubular member configured to be deployed into a wellbore; and

a swellable element disposed around the tubular member and having segments with different segment cross link densities, the segments configured to provide a cross link density in the swelleable element that varies along a thickness of the swellable element, an azimuth of the swellable element, or both.

2. The swellable packer of claim 1, wherein the cross link density of the swellable element increases from an inner diameter of the swellable element to an outer diameter of the swellable element.

3. The swellable packer of claim 1, wherein the cross link density of the swellable element varies as a linear function.

4. The swellable packer of claim 1, wherein the cross link density of the swellable element varies as a nonlinear function.

5. The swellable packer of claim 1, wherein the cross link density of the swellable element varies chaotically.

6. The swellable packer of claim 1, wherein the swellable element comprises a first segment having a first segment cross link density and a second segment having a second segment cross link density that is greater than the first segment cross link density.

7. A method of making a swellable packer, comprising:

wrapping a sheet of uncured elastomeric material around a mandrel;

curing the sheet of uncured elastomeric material to form a swellable packer comprising a swellable element; and

varying the cross link density along a thickness of the swellable element, along an azimuth of the swellable element, or both.

8. The method of claim 7, wherein varying the cross link density comprises providing transient thermal energy to the sheet during curing.

9. The method of claim 8, wherein providing the transient thermal energy comprises: heating the sheet in heating intervals of from about 1 to about 2 minutes; and cooling the sheet between the heating intervals for a time period from about 5 minutes to about 20 minutes.

10. The method of claim 7, wherein varying the cross link density comprises varying the composition of a cross linking agent disposed on the sheet.

11. The method of claim 7, wherein varying the cross link density comprises varying a concentration of a cross linking agent disposed on the sheet.

12. The method of claim 7, wherein varying the cross link density comprises increasing the cross link density from an inner diameter of the swellable packer to an outer diameter of the swellable element.

13. The method of claim 7, further comprising blending the uncured elastomeric material with granules of a cross linking agent, wherein varying the cross link density comprises varying the cross link density as a function of distance from the granules.

14. The method of claim 13, wherein varying the cross link density further comprises varying a thickness of shells encapsulating the granules to vary a release profile of the granules during curing.

15. The method of claim 13, wherein varying the cross link density further comprises varying a coating material of shells encapsulating the granules to vary a release profile of the granules during curing.

16. A method of sealing an annulus of a wellbore, comprising:

disposing a swellable packer in the wellbore, the swellable packer having a swellable element with a varying cross link density along a thickness of the swellable element, an azimuth of the swellable element, or both;

exposing the swellable element to a downhole trigger; and

swelling the swellable element into irregularities of the wellbore to provide a hermetic seal with the wellbore.

17. The method of claim 16, wherein the varying cross link density increases from an inner diameter of the swellable element to an outer diameter of the swellable element.

18. The method of claim 16, wherein the cross link density varies as a linear function.

19. The method of claim 16, wherein the cross link density varies as a nonlinear function.

20. The method of claim 19, wherein the cross link density varies randomly.