Expandable member for downhole tool

1. A method of forming an apparatus for use downhole, the method comprising the steps of:

providing a body having a longitudinal axis; and

forming an expanding portion on the body by sequentially wrapping multiple layers of a substantially cured material around the longitudinal axis of the body, the material selected to expand on exposure to at least one predetermined fluid.

2. The method as claimed in claim 1 , further comprising the step of bonding the substantially cured material on the body.

3. The method as claimed in claim 1 , further comprising the step of mechanically attaching the expanding portion to the body.

4. The method as claimed in claim 1 , wherein the expanding portion is formed from a continuous length of the substantially cured material.

5. The method as claimed in claim 1 , further comprising the step of forming a base layer on the body and forming the expanding portion on the base layer.

6. The method as claimed in claim 1 , further comprising the step of providing an outer sheath on the expanding portion.

7. The method as claimed in claim 1 , further comprising the step of treating the substantially cured material prior to forming the expanding portion.

8. The method as claimed in claim 1 , further comprising the step of applying a coating to the substantially cured material.

9. The method as claimed in claim 1 , further comprising the step of perforating the material.

10. The method as claimed in claim 1 , further comprising the step of deploying the material from a storage reel.

11. The method as claimed in claim 1 , wherein the substantially cured material is an elastomer in a T50 state or above, where T100 is the fully cured state of the elastomer.

12. The method as claimed in claim 1 , wherein the substantially cured material is an elastomer in a T80 state or above, where T100 is the fully cured state of the elastomer.

13. The method as claimed in claim 1 , wherein the substantially cured material is an elastomer in a T90 state or above, where T100 is the fully cured state of the elastomer.

14. The method as claimed in claim 1 , further comprising the step of further curing the material after forming the expanding portion on the body.

15. An apparatus comprising:

a body having a longitudinal axis;

an expanding portion formed around the longitudinal axis of the body from multiple layers of a substantially cured material, sequentially wrapped on the body, wherein the material is configured to expand on exposure to at least one predetermined fluid.

16. The apparatus as claimed in claim 15 , wherein the substantially cured material is an elastomer in a T50 state or above, where T100 is the fully cured state of the elastomer.

17. The apparatus as claimed in claim 15 , wherein the substantially cured material is an elastomer in a T80 state or above, where T100 is the fully cured state of the elastomer.

18. The apparatus as claimed in claim 15 , wherein the substantially cured material is an elastomer in a T90 state or above, where T100 is the fully cured state of the elastomer.

19. The apparatus as claimed in claim 15 , wherein the substantially cured material comprises a material selected to expand on exposure to a hydrocarbon fluid.

20. The apparatus as claimed in claim 15 , wherein the substantially cured material comprises a material selected to expand on exposure to an aqueous fluid.

21. The apparatus as claimed in claim 15 , wherein the substantially cured material is formed by an extrusion process.

22. The apparatus as claimed in claim 21 , wherein the substantially cured material is formed by a co-extrusion of two or more materials.

23. The apparatus as claimed in claim 15 , wherein the substantially cured material comprises an interlocking profile, configured for interlocking multiple layers of the material on the body.

24. The apparatus as claimed in claim 15 , further comprising a mechanical attachment for securing the substantially cured material to the body.

25. The apparatus as claimed in claim 15 , wherein the substantially cured material comprises a coating.

26. The apparatus as claimed in claim 15 , wherein the substantially cured material comprises perforations.

27. The apparatus as claimed in claim 15 , further comprising a support element disposed between the body and the substantially cured material.

28. The apparatus as claimed in claim 27 , wherein the support element defines a passage for a conduit or cable through the apparatus.

29. The apparatus as claimed in claim 15 , wherein the apparatus is part of a wellbore packer.

30. A method of forming an apparatus for use downhole, the method comprising the steps of:

providing a body having a longitudinal axis;

forming an expanding portion on the body by sequentially wrapping multiple layers of a partially cured material around the longitudinal axis of the body, the material selected to expand on exposure to at least one predetermined fluid.

31. The method as claimed in claim 30 , wherein the partially cured material is preferably an elastomer in a cured state in the range of T30 to T50, where T100 is the fully cured state of the elastomer.

32. The method as claimed in claim 31 , further comprising the step of further curing the material subsequent to forming the expanding portion.

33. An apparatus for use downhole, the apparatus comprising:

a body having a longitudinal axis;

an expanding portion formed on the body from multiple layers of a partially cured material sequentially wrapped around the longitudinal axis of the body, the material selected to expand on exposure to at least one predetermined fluid.

34. The apparatus as claimed in claim 33 , wherein the material is partially cured such that it is in a cured state in the range of T30 to T50, where T100 is the fully cured state of the elastomer.

35. The apparatus as claimed in claim 33 , wherein the apparatus is part of a wellbore packer.