Schlumberger Technology Corporation

Frederique Kalb

Christine Aussibal

Xu Wu

Christian Chouzenoux

Pierre Mouget

Laurent P Prouvost

Carolina Dautriche

A magneto-optic sensor for oilfield application, the sensor () receives an incident beam IB, IB, IB, IB, IBand comprises a polarizing element () for providing a determined state of polarization beam and a Faraday rotator () for providing a response beam having a modified state of polarization. The sensor provides a response beam (RB, RB, RB, RB, RBhaving 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 ().

Magneto-optical sensor

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.

Device for measuring a fluid flow velocity and direction

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.

Methods and apparatus to optically determine velocities of downhole fluids

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.

Growing community of inventors

Boncourt, France

Frederique Kalb