Methods and apparatus to optically determine velocities of...

E - Fixed Constructions – 21 – B

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E21B 47/00 (2006.01) G01F 1/00 (2006.01) G01P 5/00 (2006.01)

Patent

CA 2759886

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.

L'invention porte sur des procédés et sur un appareil pour déterminer optiquement des vitesses de fluides de fond de trou. Certains exemples de procédés pour déterminer une vitesse d'un fluide de fond de trou comprennent l'excitation d'une substance fluorescente dans un fluide de fond de trou avec un signal optique par l'intermédiaire d'une interface optique. Les exemples de procédés comprennent en outre la détection d'une fluorescence du fluide de fond de trou par l'intermédiaire d'une fibre optique à une distance prédéterminée de l'interface optique, et la détermination de la vitesse du fluide de fond de trou en fonction de la fluorescence détectée.

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