Through-bore spool apparatus

1. A through-bore spool apparatus for use in deploying multiple spoolable media in a bore, the through-bore spool apparatus comprising:

a first spool comprising a first spool axis and a first spoolable medium wound around the first spool axis; and

a second spool comprising a second spool axis and a second spoolable medium wound around the second spool axis;

wherein the first and second spoolable media are de-spoolable simultaneously from the respective first and second spools during movement of the through-bore spool apparatus along a bore, and

wherein the first and second spoolable media are de-spoolable simultaneously from a common side of the through-bore spool apparatus.

2. The through-bore spool apparatus according to claim 1 , wherein the second spool is arranged on one axial side of the first spool.

3. The through-bore spool apparatus according to claim 1 , wherein the second spoolable medium extends axially through the first spool from one side of the first spool to the other.

4. The through-bore spool apparatus according to claim 1 , wherein the first spool defines an axial passage to accommodate the second spoolable medium to pass therethrough.

5. The through-bore spool apparatus according to claim 1 , comprising a third spool comprising a third spool axis and a third spoolable medium wound around the third spool axis, wherein at least one of:

the third spool is arranged on one axial side of the second spool;

the first, second and third spools are axially arranged with the second spool axially interposed between the first and third spools; and

the third spoolable medium extends axially through the second spool, and the second and third spoolable media extends axially through the first spool.

6. The through-bore spool apparatus according to claim 1 , wherein the first and second spoolable media form a media bundle which extends from the through-bore spool apparatus.

7. The through-bore spool apparatus according to claim 1 , wherein at least one of the first and second spool apparatus is for use in at least one of distributed temperature sensing (DTS), distributed pressure sensing (DPS) and distributed acoustic sensing (DAS).

8. The through-bore spool apparatus according claim 1 , wherein at least one of the first and second spoolable media comprises at least one of an optical fibre, an electrical conductor and a strength member.

9. The through-bore spool apparatus according to claim 1 , wherein the first and second spoolable media are defined by separate lengths of unconnected media.

10. The through-bore spool apparatus according to claim 1 , wherein the first and second spoolable media are defined by a continuous spoolable medium, with a first length of the continuous spoolable medium wound on the first spool, and a second length of the continuous spoolable medium may be wound on the second spool.

11. The through-bore spool apparatus according to claim 10 , wherein the first and second lengths of the continuous spoolable medium are deployable simultaneously to form a loop of elongate medium in the bore.

12. The through-bore spool apparatus according to claim 1 , wherein both the first and second spools comprise a bobbin upon which the associated spoolable media is wound.

13. The through-bore spool apparatus according to claim 12 , wherein the first and second spools comprise respective bobbins.

14. The through-bore spool apparatus according to claim 12 , wherein the first and second spools comprise a single bobbin which accommodates both the first and second spoolable media, the single bobbin defining separate winding regions to accommodate discrete winding of the first and second spoolable media thereon.

15. The through-bore spool apparatus according to claim 1 , comprising a housing, wherein at least one of the first and second spools is mounted within the housing.

16. The through-bore spool apparatus according to claim 1 , wherein at least one of the first and second spoolable media is wound on a respective spool to form a plurality of wrap segments arranged axially along the respective spool axis, wherein adjacent wrap segments partially overlap in the axial direction.

17. The through-bore spool apparatus according to claim 16 , wherein each wrap segment comprises a first wrap layer wound in a first axial direction over a first axial distance, and a second wrap layer wound over the first wrap layer in a reverse second axial direction over a second axial distance greater than the first axial distance, the spoolable medium extending from the second wrap layer of one wrap segment to the first wrap layer of an adjacent wrap segment.

18. A method for deploying multiple spoolable media within a bore, comprising:

locating a through-bore spool apparatus within the bore, wherein the through-bore spool apparatus comprises a first spool comprising a first spoolable medium and a second spool comprising a second spoolable medium; and

moving the through-bore spool apparatus through the bore while simultaneously de-spooling the first and second spoolable media from the respective first and second spools from a common side of the through-bore spool apparatus.

19. A method for deploying a loop of a spoolable medium within a bore, comprising:

locating a through-bore spool apparatus within the bore, wherein the through-bore spool apparatus comprises:

a first spool comprising a first length of the spoolable medium wound thereon, the first length of the spoolable medium comprising a first end of the spoolable medium; and

a second spool comprising a second length of the spoolable medium thereon, wherein the second length of the spoolable medium comprises a second end of the spoolable medium a second spool; and

moving the through-bore spool apparatus through the bore while simultaneously de-spooling the first and second ends of the spoolable medium from the respective first and second spools from a common side of the through-bore spool apparatus to form a loop.