Abstract: A power cable (10) includes at least one electrical conductor (12) and at least one interstice (14) in the vicinity of the electrical conductor (12). The cable (10) further has at least one electronic device (18) for radiofrequency identification and at least one tube (16) arranged in the at least one interstice (14) and containing the electronic device (18) for radiofrequency identification.

Abstract: A magneto-optic sensor for oilfield application, the sensor (1, 1?, 101, 101?) receives an incident beam IB, IBA, IBB, IBC, IBD and comprises a polarizing element (3, 103) for providing a determined state of polarization beam and a Faraday rotator (4, 104) for providing a response beam having a modified state of polarization. The sensor provides a response beam (RB, RBA, RBB, RBC, RBD having an intensity dependent on an external magnetic field representative of a particular characteristic of a well-bore casing CC, CR applied on the Faraday rotator (4, 104).

Abstract: A device and method for measuring a fluid flow velocity and direction. The device includes: a modulator for modulating an incident signal from a fiber optical arrangement. The modulator includes an encoder resulting in a modulated signal having at least a first portion, a second portion and a third portion for each complete rotation of the encoder. The device further includes a processor for determining the fluid flow velocity and direction based on at least the first portion, the second portion and the third portion of the modulated signal. The method includes modulating an incident beam to have a first portion, a second portion and a third portion for each rotation of an encoder and processing the modulated signal to determine a fluid flow velocity and direction.

Abstract: Methods and apparatus to optically determine velocities of downhole fluids are disclosed. Some example methods to determine a velocity of a downhole fluid include exciting a fluorescent substance in a downhole fluid with an optical signal via an optical interface. The example methods further include detecting fluorescence of the downhole fluid via an optical fiber at a predetermined distance from the optical interface, and determining the velocity of the downhole fluid based on the detected fluorescence.

Abstract: An apparatus for measuring an internal dimension of a well-bore comprising a tool adapted to be positioned inside the well bore. The tool comprises an optical caliper comprising an optical sensor providing a response correlated to the internal dimension of the well bore, the optical sensor being coupled to an optical fiber.

Abstract: Methods and apparatus to optically determine velocities of downhole fluids are disclosed. Some example methods to determine a velocity of a downhole fluid include exciting a fluorescent substance in a downhole fluid with an optical signal via an optical interface. The example methods further include detecting fluorescence of the downhole fluid via an optical fiber at a predetermined distance from the optical interface, and determining the velocity of the downhole fluid based on the detected fluorescence.

Abstract: A device 1 for measuring a fluid flow FF velocity and direction comprises: —a pivotable means 2 adapted to rotate at a pivotable means rotation velocity and direction depending on the fluid flow velocity and direction when in contact with the fluid flow, —a modulator 3 coupled to the pivotable means and adapted to rotate in conjunction with the pivotable means, —a fiber optical arrangement for providing an incident beam IB to the modulator and for receiving a return beam RB from the modulator, —the incident beam IB comprising an incident signal, the return beam RB comprising a modulated signal, the modulator 3 modulating the incident signal so as to form the modulated signal depending on the pivotable means 2 rotation velocity and direction.

Abstract: A magneto-optic sensor for oilfield application, the sensor (1, 1?, 101, 101?) receives an incident beam IB, IBA, IBB, IBC, IBD and comprises a polarizing element (3, 103) for providing a determined state of polarization beam and a Faraday rotator (4, 104) for providing a response beam having a modified state of polarization. The sensor provides a response beam (RB, RBA, RBB, RBC, RBD having an intensity dependent on an external magnetic field representative of a particular characteristic of a well-bore casing CC, CR applied on the Faraday rotator (4, 104).

Abstract: An apparatus for measuring an internal dimension of a well-bore comprising a tool (1) adapted to be positioned inside the well bore. The tool comprises an optical caliper (312) comprising an optical sensor providing a response correlated to the internal dimension of the well bore, the optical sensor being coupled to an optical fiber (311A).