Communication between downhole tool and surface location

1. A system for communicating between a downhole tool and a surface location, comprising:

a downhole tool disposed on a tubing string within a subsea riser, wherein the downhole tool includes at least one device that actuates between first and second positions, wherein one of the at least one device comprises a latch that couples the downhole tool to the tubing string;

an internal transducer coupled to the downhole tool and adapted to transmit wirelessly a signal indicative of the position of the device, the internal transducer being located within the subsea riser;

an external transducer positioned on an exterior of the subsea riser, wherein the external transducer receives the signal wirelessly from the internal transducer through the subsea riser; and

a transponder positioned on an exterior of the subsea riser and coupled to the external transducer, wherein the transponder is adapted to transmit a signal to a surface location indicative of the position of the at least one device.

2. The system of claim 1 , wherein one of the at least one device comprises a valve disposed within the downhole tool.

3. The system of claim 1 , wherein the signal from the internal transducer indicates whether the latch is coupling the downhole tool to the tubing string or whether the latch has released the downhole tool from the tubing string.

4. The system of claim 1 , further comprising a plurality of external transducers that are circumferentially offset from one another around the riser.

5. The system of claim 1 , further comprising a plurality of external transducers that are axially offset from one another and parallel to a centerline through the riser.

6. The system of claim 1 , further comprising a clamp that secures the external transducer to the exterior of the riser.

7. The system of claim 1 , further comprising one or more lines positioned radially-outward from the riser, wherein the one or more lines are selected from the group consisting of a choke line, a kill line, a boost line, and a hydraulic line, and wherein the clamp and the external transducer are positioned radially-inward from the one or more lines.

8. The system of claim 1 , wherein the external transducer is coupled to a remotely operated vehicle that is adapted to position the external transducer radially-outward from the internal transducer.

9. The system of claim 1 , wherein the signal from the transponder is wireless.

10. A method for communicating between a downhole tool and a surface location, comprising:

running a downhole tool into a subsea riser, wherein the downhole tool includes a device that actuates between a first position and a second position, and wherein the device comprises a valve or a latch;

detecting the position of the device with a sensor;

communicating data from the sensor to an internal transducer positioned within the subsea riser; and

transmitting a signal from the an internal transducer coupled to the downhole tool to an external transducer positioned on an exterior of the subsea riser, wherein the signal from the internal transducer is indicative of the position of the device.

11. The method of claim 10 , wherein the signal from the internal transducer transponder comprises an acoustic signal.

12. The method of claim 10 , further comprising coupling the external transducer to the exterior of the riser with a remotely operated vehicle.

13. The method of claim 10 , further comprising:

transmitting a signal from the external transducer to a transponder positioned on an exterior of the riser, wherein the signal from the external transducer is indicative of the position of the device; and

transmitting a signal from the transponder to a surface location, wherein the signal from the transponder is indicative of the position of the device.

14. The method of claim 10 , further comprising:

transmitting a signal from the external transducer to a remotely operated vehicle positioned on an exterior of the riser, wherein the signal from the external transducer is indicative of the position of the device; and

transmitting a signal from the remotely operated vehicle to a surface location via a tether line coupled to the remotely operated vehicle, wherein the signal from the remotely operated vehicle is indicative of the position of the device.

15. A method for communicating between a downhole tool and a surface location, comprising:

running a downhole tool into a subsea riser, wherein the downhole tool includes a device that actuates between a first position and a second position;

placing an internal transducer, located within the subsea riser, in communication with a sensor monitoring the device;

positioning an external transducer about an exterior of the subsea riser with a remotely operated vehicle; and

transmitting a signal from the an internal transducer coupled to the downhole tool through the subsea riser and to the external transducer, wherein the signal from the internal transducer is indicative of the position of the device.

16. The method of claim 15 , wherein the external transducer is coupled to a clamp, and further comprising positioning the clamp about the exterior of the riser with the remotely operated vehicle.

17. The method of claim 16 , wherein one or more lines are positioned radially-outward from the riser, and further comprising positioning the clamp and the external transducer radially-inward from the one or more lines.

18. The method of claim 17 , wherein the one or more lines are selected from the group consisting of a choke line, a kill line, a boost line, and a hydraulic line.

19. The method of claim 18 , further comprising:

transmitting a signal from the external transducer to a transponder positioned on an exterior of the riser, wherein the signal from the external transducer is indicative of the position of the device; and

transmitting a signal from the transponder to a surface location, wherein the signal from the transponder is indicative of the position of the device.