Flow control device

1. A downhole flow control device, comprising:

a body to be secured within a wall of a tubular, wherein the body defines a flow path therethrough;

a nozzle mounted within the body flow path; and

a dissipation structure secured to the body and positioned on a first side of the nozzle, such that fluid flowing through the body in a first direction will exit the nozzle and impinge on the dissipation structure prior to exit from the flow control device, the dissipation structure being spatially fixed relative to the nozzle, and

the dissipation structure including a dissipation insert within the flow control device, the dissipation insert also being secured to the body and being aligned with the nozzle such that fluid exiting the nozzle impinges on the dissipation insert,

wherein the dissipation insert is secured so as to prevent movement relative to the body of the flow control device.

2. The downhole flow control device according to claim 1 , mountable relative to the tubular such that a desired flow direction is aligned with the first direction.

3. The downhole flow control device according to claim 1 , wherein the flow control device defines a flow restriction to establish a back pressure in fluid flowing through the flow control device.

4. The downhole flow control device according to claim 1 , wherein at least a portion of the dissipation structure is mounted within the flow path of the body.

5. The downhole flow control device according to claim 1 , wherein the dissipation structure defines an impingement surface aligned with the nozzle such that fluid exiting the nozzle will impinge on the impingement surface.

6. The downhole flow control device according to claim 1 , wherein the nozzle defines a flow axis and, in use, fluid flow through the nozzle is substantially aligned with the flow axis, wherein the dissipation structure deviates or deflects the flow from the flow axis following exiting from the nozzle.

7. The downhole flow control device according to claim 6 , wherein the dissipation structure deviates or deflects the flow substantially radially relative to the flow axis.

8. The downhole flow control device according to claim 6 , wherein at least a portion of the dissipation structure is arranged transverse to the nozzle flow axis to facilitate impingement of fluid exiting the nozzle onto the dissipation structure, and deflection of said fluid.

9. The downhole flow control device according to claim 1 , wherein at least a portion of the dissipation structure is integrally formed with the body.

10. The downhole flow control device according to claim 1 , wherein at least a portion of the dissipation structure is separately formed and mounted or secured within the flow control device.

11. The downhole flow control device according to claim 1 , wherein the dissipation insert defines an impingement surface, wherein when the dissipation insert is mounted within the flow control device the impingement surface of said dissipation insert is aligned with the nozzle such that fluid exiting the nozzle will impinge on the dissipation insert impingement surface.

12. The downhole flow control device according to claim 1 , wherein the dissipation insert is mounted within a dissipation pocket formed within the body.

13. The downhole flow control device according to claim 1 , wherein the dissipation structure comprises a base member, wherein said base member supports the dissipation insert.

14. The downhole flow control device according to claim 13 , wherein the base member defines a pocket for receiving the dissipation insert.

15. The downhole flow control device according to claim 1 , wherein the dissipation insert comprises a different material from the body, the different material being harder than the body.

16. The downhole flow control device according to claim 1 , wherein the dissipation insert comprises a disk mountable within a cylindrical pocket formed on the body.

17. The downhole flow control device according to claim 1 , comprising or defining at least one flow port which receives fluid from the dissipation structure, to permit said fluid to exit the flow control device.

18. The downhole flow control device according to claim 17 , wherein the flow port defines an exit flow port during fluid flow in the first direction, and during reverse flow in an opposite, second direction, the flow port defines an inlet flow port.

19. The downhole flow control device according to claim 17 , wherein at least one flow port extends or faces axially relative to the flow control device, and is provided within an end face of the flow control device.

20. The downhole flow control device according to claim 17 , wherein at least one flow port extends or faces radially relative to the flow control device, and is provided within a cylindrical side wall of the flow control device.

21. The downhole flow control device according to claim 17 , wherein at least one flow port is defined by or within the body.

22. The downhole flow control device according to claim 17 , wherein at least one flow port is defined by or within the dissipation structure.

23. The downhole flow control device according to claim 17 , wherein at least one flow port is defined between the body and the dissipation structure.

24. The downhole flow control device according to claim 17 , comprising a plurality of flow ports arranged circumferentially relative to the dissipation structure.

25. The downhole flow control device according to claim 1 , comprising:

a first dissipation structure provided on a first side of the nozzle such that fluid flowing through the body in the first direction will exit the nozzle and impinge on the first dissipation structure prior to exit from the flow control device; and

a second dissipation structure provided on a second side of the nozzle, which is opposite to the first side, such that fluid flowing through the body in a second direction, opposite to the first direction, will exit the nozzle and impinge on the second dissipation structure prior to exit from the flow control device.

26. The downhole flow control device according to claim 1 , wherein the nozzle comprises or defines at least one nozzle port to permit fluid communication with the body flow path.

27. The downhole flow control device according to claim 1 , comprising a flow direction control arrangement for permitting flow through the device in a desired direction.

28. The downhole flow control device according to claim 27 , wherein the flow direction control arrangement is associated with the nozzle.

29. The downhole flow control device according to claim 27 , wherein the flow direction control arrangement comprises a one way valve arrangement.

30. The downhole flow control device according to claim 29 , wherein the one way valve arrangement comprises a valve member configured to cooperate with a valve seat to selectively block a nozzle port within the nozzle.

31. The downhole flow control device according to claim 30 , wherein the dissipation structure defines or comprises a biasing arrangement for biasing the valve member.

32. The downhole flow control device according to claim 1 , wherein at least a portion of the nozzle is integrally formed with the body.

33. The downhole flow control device according to claim 1 , wherein at least a portion of the nozzle is separately formed and subsequently secured to the body.

34. The downhole flow control device according to claim 1 , wherein the nozzle comprises a nozzle insert mounted within a nozzle pocket formed within the body.

35. The downhole flow control device according to claim 34 , wherein the nozzle insert comprises or defines an orifice.

36. The downhole flow control device according to claim 1 , wherein at least a portion of the nozzle and dissipation structure are defined on a common insert mounted or mountable within the body.

37. A downhole flow control method, comprising:

arranging a flow control device in a wall of a tubular, wherein the flow control device includes a nozzle and a dissipation structure located on one side of the nozzle, the dissipation structure being secured to a body and spatially fixed relative to the nozzle, the dissipation structure including a dissipation insert arranged within the flow control device, the dissipation insert also being secured to the body and being aligned with the nozzle; and

permitting flow through a nozzle in a first direction such that fluid exiting the nozzle impinges on the dissipation insert of the dissipation structure prior to exit from the flow control device,

wherein the dissipation insert is secured so as to prevent movement relative to the body of the flow control device.