Downhole packer and associated methods

1. A downhole seal device, comprising:

a support member;

first and second end members fixed to opposing ends of the support member, the support member and the first and second end members at least partially defining a through passage;

an outer seal mounted on the support member;

at least one collet member configured to selectively grip an elongate structure, the collet member including a plurality of collet fingers configured to fix the downhole seal device to an elongate structure; and

at least one inner seal configured to seal against the elongate structure;

wherein one or both of the first and second end members comprises the at least one collet member and a cooperating member, the cooperating member configured to selectively engage the plurality of collet fingers so as to move the collet fingers radially; and

wherein the at least one inner seal is provided between at least part of the at least one collet member and at least part of the cooperating member.

2. The seal device according to claim 1 , wherein the support member is a rigid member that is rigidly fixed to the first and second end members.

3. The seal device according to claim 1 , wherein the seal device is an eccentric seal device.

4. The seal device according to claim 1 , wherein at least one of the outer seal and the at least one inner seal comprises a swellable seal.

5. The seal device according to claim 4 , wherein at least one of the outer seal and the at least one inner seal is configured to be selectively swellable in a downhole fluid.

6. The seal device according to claim 4 , wherein at least one of the outer seal and the at least one inner seal comprises a non-swelling seal.

7. The seal device according to claim 1 , wherein the at least one collet member is comprised in one or both of the first and second end members.

8. The seal device according to claim 1 , wherein the at least one collet member comprises or is configured to receive one or more threaded members for securing the at least one collet member on the elongate structure.

9. The seal device according to claim 1 , comprising one or more deformable support elements between one or both end members and the outer seal.

10. The seal device according to claim 9 , wherein the one or more support elements defines a circumferential recess in a face of the support element and a protruding portion of the outer seal and/or at least one other support element is located or receivable in the recess.

11. The seal device according to claim 1 , comprising at least one lock device for selectively gripping the elongate structure upon which the seal device is mounted.

12. The seal device of claim 11 wherein the at least one lock device is provided proximate the at least one inner seal.

13. The seal device according to claim 1 , wherein an outer diameter of at least one of the end members is greater than the outer diameter of the support member, and at least part of the outer seal is provided between the end members.

14. The seal device according to claim 1 , comprising a longitudinally extending line passage configured to carry at least one control line.