Patent ID: 8436743

Claim:
A system for measuring a parameter within a well, made of: a first apparatus, embodied within a first plug, comprising a first reel of first wound optic fiber line, wherein the first reel is in a collar launching, a first part of the first optic fiber line is wound and a second part of the first optic fiber line is unwound in an annulus; at least a first sensor located on said second part wherein said first sensor is able to measure the parameter of said annulus, wherein information on said parameter can be transmitted through the first optic fiber; a second apparatus, embodied within a second plug, comprising a second reel of second wound optic fiber line, inside the second plug, that is able to be unwound from the second reel, an extremity of the second optic fiber being fixed to a reference point; a light transmitter or receiver device linked to the reference point and able to generate or detect a light pulse through the second optic fiber line; and an exchange device to transfer said light pulse between the first and the second optic fiber line.