Linear displacement measurement method and apparatus

Details Linear displacement measurement method and apparatus Linear displacement measurement method and apparatus

E - Fixed Constructions

21

B

E21B 47/14 (2006.01) E21B 29/02 (2006.01) E21B 47/06 (2006.01) E21B 47/10 (2006.01) E21B 47/12 (2006.01)

Patent

CA 2455103

Methods and apparatus for detecting an operation of a downhole tool using an optical sensing system are disclosed. In an embodiment, a flow control device has an inner tubular member moveable relative to an outer tubular member and a thermally responsive chamber capable of a change in temperature during a movement between the inner tubular member and the outer tubular member. Detecting the change in temperature in the thermally responsive chamber with an optical sensing system provides real time knowledge of the position of the flow control device. In another embodiment, a flow control device comprises an inner tubular member moveable relative to an outer tubular member that produces an acoustic signal during a movement between the inner tubular member and the outer tubular member. Detecting the acoustic signal with an optical sensor provides real time knowledge of the position of the flow control device.

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