Subsea communications system

• US 7,261,162 B2
• Filed: 08/15/2003
• Issued: 08/28/2007
• Est. Priority Date: 06/25/2003
• Status: Active Grant

• Current Assignee: Onesubsea IP UK Limited (Schlumberger NV)
• Original Assignee: Schlumberger Technology Corporation (Schlumberger NV)
• Inventors: Kerr, John A., Smedstad, Eric, MacKenzie, Roderick, Mathis, David J., Deans, Gregor E.
• Primary Examiner(s): Beach; Thomas A
• Application Number:
  US10/641,652
• Publication Number:
  US 20040262008A1
• Time in Patent Office: 1,474 Days
• Field of Search: 166/336, 166/368, 166/250.01, 3408531-8533, 340/853.9, 340/854.7, 340/856.3
• US Class Current: 166/336
• CPC Class Codes: E21B 41/0007 for underwater installations E21B41/005, E21B41/04, E21B41/06, E21B41/08, E21B41/10 take precedence
• CPC Class Codes: E21B 47/12 Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling
• CPC Class Codes: H01Q 1/04 Adaptation for subterranean or subaqueous use
• CPC Class Codes: H04B 10/25 Arrangements specific to fibre transmission
• CPC Class Codes: H04B 3/50 Systems for transmission between fixed stations via two-conductor transmission lines H04B3/54 takes precedence

Abstract

A subsea communications module includes an interface to communicate with a surface facility over a communications link using a packet-based protocol. The communications link can be implemented with a fiber optic line, wire-based line, and/or other types of communications lines.

Claims

1. A method for use with a subsea well, comprising:

providing a subsea communication module;

coupling, using a communications link, the subsea communication module to surface equipment;

receiving, at the subsea communication module, data from at least one sensor associated with the subsea well; and

sending, from the subsea communication module to the surface equipment, the received data in Internet Protocol packets over the communications link.

2. The method of claim 1, wherein receiving the data from the sensor comprises receiving the data from a sensor located proximate a seabed.

3. The method of claim 1, wherein receiving the data from the sensor comprises receiving the data from a sensor located downhole in a subsea well.

4. The method of claim 1, wherein providing the subsea communication module comprises providing the subsea communication module as part of subsea wellhead equipment.

5. The method of claim 1, wherein providing the subsea communication module comprises mounting the subsea communication module to the subsea wellhead equipment.

6. The method of claim 5, wherein mounting the subsea communication module to the subsea wellhead equipment comprises mounting the subsea communication module using a remote-operated vehicle.

7. The method of claim 1, further comprising:

receiving, at the communication module, a control command in one or more packets over the communications link from the surface equipment; and

sending the control command to at least one control device associated with the subsea well.

8. The method of claim 7, wherein sending the received data in packets and receiving the control command in the one or more packets is performed by an interface to a fiber optic link, the communications link comprising the fiber optic link.

9. The method of claim 7, further comprising decapsulating the one or more packets to extract the control command.

10. The method of claim 9, wherein decapsulating the one or more packets is performed by a Transmission Control Protocol/Internet Protocol stack in the subsea communication module.

11. The method of claim 1, wherein providing the subsea communication module comprises providing a module having a container sealed from outside sea water, wherein electrical components are provided in the container.

12. The method of claim 11, further comprising:

coupling the subsea communication module to sensors associated with multiple subsea wells; and

receiving data, at the subsea communication module, from the sensors associated with the multiple subsea wells.

13. The method of claim 1, further comprising coupling plural subsea communication modules to the communications link.

14. The method of claim 13, further comprising coupling plural devices to each subsea communication module, the devices including at least one of sensors and control devices.

15. The method of claim 14, wherein at least some of the sensors and control devices are network-enabled, the method further comprising:

a remote host accessing the network-enabled sensors and control devices using Internet Protocol communications.

16. The method of claim 15, the remote host communicating with the network-enabled sensors and control devices using Internet Protocol addresses of the network-enabled sensors and control devices.

17. The method of claim 13, further comprising controlling input/output tasks of a first one of the subsea communication modules by a second one of the subsea communication modules in case of failure of a processor of the first one of the subsea communication modules.

18. The method of claim 13, further comprising dividing a task into plural portions for concurrent execution by the subsea communication modules.

19. The method of claim 1, further comprising performing real-time monitoring of the at least one sensor.

20. The method of claim 1, wherein providing the subsea communication module comprises providing the subsea communication module separate from components providing for well control of the subsea well.

21. The method of claim 20, further comprising removing the subsea communication module without affecting well control.

22. The method of claim 1, further comprising encrypting communications over the communications link.

23. The method of claim 1, further comprising the subsea communication module performing tasks in response to triggering events.

24. The method of claim 1, further comprising providing a separate, wireless link between the subsea communication module and the surface equipment as a redundant link.

25. The method of claim 1, wherein receiving the data from the at least one sensor comprises receiving Internet Protocol packets from the at least one sensor over a link that couples the subsea communication module and the at least one sensor.

26. The method of claim 1, further comprising:

coupling an acoustic link between the subsea communication module and the surface equipment; and

selecting the acoustic link by the subsea communication module to communicate with the surface equipment if the communications link fails.

27. The method of claim 1, further comprising providing a redundant, wireless link that is selected for communications between the subsea communication module and the surface equipment if the communications link fails.

28. A system for use with a subsea well, comprising:

surface equipment;

a subsea communication module having an interface; and

a communications link coupling the surface equipment to the subsea communication module, the interface of the subsea communication module to communicate with the surface equipment over the communications link according to an Internet Protocol.

29. The system of claim 28, wherein the subsea communication module includes a connector to receive data from a sensor associated with the subsea well.

30. The system of claim 28, further comprising subsea wellhead equipment, wherein the subsea communication module is mounted to the subsea wellhead equipment.

31. The system of claim 30, further comprising a remote operated vehicle to mount the subsea communication module to the subsea wellhead equipment.

32. The system of claim 28, wherein the interface of the subsea communication module is adapted to receive a control command in one or more Internet Protocol packets over the communications link from the surface equipment, and the subsea communication module includes another interface to send the control command to at least one control device associated with the subsea well.

33. The system of claim 28, wherein the communications link comprises a fiber optic link, and the subsea communication module comprises a fiber optic modem.

34. The system of claim 28, wherein the communications link comprises an electrical line.

35. The system of claim 28, wherein the subsea communication module comprises a Transmission Control Protocol/Internet Protocol stack.

36. The system of claim 28, wherein the subsea communication module comprises a container sealed from outside sea water, wherein electrical components are provided in the container.

37. The system of claim 28, wherein the surface equipment comprises a sea vessel.

38. The system of claim 28, further comprising another subsea communication module coupled to the communications link.

39. The system of claim 38, further comprising sensors and control devices, wherein each subsea communication module is coupled to at least one of a sensor and control device.

40. The system of claim 39, wherein at least one of the sensors and control devices is network enabled to allow network access of the at least one of the sensors and control devices over the communications link.

41. The system of claim 40, wherein each subsea communication module includes a processor, wherein the processor of one subsea communication module is able to take over processor tasks of another subsea communication module if failure of the processor of the another subsea communication module occurs.

42. The system of claim 28, wherein the subsea communication module includes a storage to store data received from a sensor.

43. The system of claim 28, further comprising an acoustic link between the subsea communication module and the surface equipment, the acoustic link selected by the subsea communication module to communicate if the communication link fails.

44. The system of claim 28, further comprising a subsea production control system that is separate from the subsea communication module.

45. The system of claim 44, wherein the subsea communication module is removable without affecting well control operations performed by the subsea production control system.

46. The system of claim 44, wherein the subsea production control system and the subsea communication module communicate over the communications link over different wavelengths.

47. The system of claim 28, wherein the surface equipment is adapted to perform real-time operations in the subsea well based on communications over the communications link.

48. The system of claim 28, further comprising a sensor for positioning downhole in the subsea well, the subsea communication module to receive data from the sensor.

49. The system of claim 28, further comprising a sensor to communicate Internet Protocol packets with the subsea communication module.

50. A subsea communication module comprising:

a first interface to at least one of a sensor and a control device associated with a subsea well;

a second interface to a communications link to be coupled to surface equipment; and

a controller to process data,

wherein the second interface is adapted to communicate over the communications link according to an Internet Protocol.

51. The subsea communication module of claim 50, wherein the second interface comprise an optical modem.

52. The subsea communication module of claim 50, wherein the second interface comprises an Internet Protocol layer.

53. The subsea communication module of claim 52, wherein the second interface comprises a Transmission Control Protocol/Internet Protocol stack.

54. The subsea communication module of claim 50, the first interface to communicate Internet Protocol packets to at least one of a sensor and control device.

55. The subsea communication module of claim 50, further comprising a third interface to an acoustic link,

wherein the controller selects the acoustic link to communicate with the surface equipment if the communications link fails.

56. The subsea communication module of claim 50, further comprising a third interface to a wireless link,

the controller to select the wireless link for communications with the surface equipment if the communications link fails.