Detecting a moveable device position using electromagnetic induction logging

1. A method for detecting a position of a downhole moveable device, the method comprising:

emitting an electromagnetic (“EM”) field into a wellbore using a logging tool transmitter, thereby inducing current in a moveable device which produces secondary electromagnetic fields that emits from the moveable device;

using a receiver of the logging tool to detect the secondary electromagnetic fields as response signals; and

determining an operational position of the moveable device using the response signals, wherein determining the operational position comprises azimuthally determining the operational position of the moveable device.

2. A method as defined in claim 1 , wherein determining the operational position comprises:

using one or more response signals to generate a response log of the moveable device;

comparing the response log with a baseline log of the moveable device; and

determining the operational position of the moveable device based upon the comparison.

3. A method as defined in claim 2 , wherein the baseline log is generated at a surface location.

4. A method as defined in claim 2 , wherein the baseline log is generated within the wellbore.

5. A method as defined in claim 2 , wherein:

the baseline log is generated before the moveable device is actuated; and

the response log is generated after the moveable device is actuated.

6. A method as defined in claim 2 , wherein comparing the response log with the baseline log comprises using a pattern recognition technique to perform the comparison.

7. A method as defined in claim 2 , further comprising aligning the response log and baseline log with respect to true depth.

8. A method as defined in claim 7 , wherein:

the moveable device is a sliding sleeve that forms part of a sliding sleeve assembly; and

the alignment is achieved by aligning portions of the response log and baseline log representing stationary features of the sliding sleeve assembly.

9. A method as defined in claim 7 , wherein the alignment is achieved by aligning portions of the response log and baseline log representing features of a tubing along which the moveable device is positioned.

10. A method as defined in claim 9 , wherein the feature is a collar.

11. A method as defined in claim 7 , wherein the alignment is achieved by aligning portions of the response log and baseline log representing a wellbore formation.

12. A method as defined in claim 1 , wherein determining the operational position comprises:

using one or more response signals to generate a response log of the moveable device;

comparing the response log to a baseline log library, the baseline log library containing logs comprising response signals of the moveable device at a plurality of operational positions; and

determining the operational position of the moveable device based upon the comparison.

13. A method as defined in claim 1 , further comprising cancelling a direct signal from the response signals.

14. A method as defined in claim 2 , wherein:

the moveable device is a sliding sleeve;

the baseline log is generated by moving a logging tool downhole past the sliding sleeve, the logging tool comprising an intervention tool to actuate the sleeve after the baseline log is generated; and

the response log is generated by moving the logging tool uphole past the actuated sliding sleeve.

15. A method as defined in claim 1 , wherein a logging tool comprising multiple azimuthally distributed EM field coils is utilized to determine the operational position of the moveable device.

16. A method as defined in claim 15 , further comprising generating an image of downhole tubing based upon the azimuthally determined operational position of the moveable device.

17. A logging tool, comprising:

an electromagnetic (“EM”) field transmitting coil; and

an EM field receiving coil,

wherein the transmitting and receiving coils are communicably coupled to processing circuitry to perform any method as defined in any one of claims 1 - 14 , 15 or 15 - 16 .

18. A logging tool as defined in claim 17 , wherein:

the transmitting coil is positioned at a lower end of the logging tool; and

the receiving coil is positioned at an upper end of the logging tool.

19. A logging tool as defined in claim 17 , further comprising an intervention tool adapted to actuate a sliding sleeve between an open and closed position.

20. A logging tool as defined in claim 17 , wherein the processing circuitry forms part of the logging tool.

21. A logging tool as defined in claim 17 , further comprising deployable arms upon which the transmitting and receiving coils are positioned.

22. A logging tool as defined in claim 17 , wherein the logging tool forms part of a wireline, slickline, or drilling assembly.