Apparatus and method for protecting devices, especially...

G - Physics – 02 – B

Patent

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G02B 5/08 (2006.01) G02B 6/00 (2006.01) E21B 47/01 (2006.01) E21B 47/06 (2006.01)

Patent

CA 2644216

The present invention relates to protecting optical devices, such as an optical fibre sensor connected in series with a cable, from a hostile environment, such as encountered when making measurements in oil and gas wells. A liquid can protect the optical device. Packaging an optical fibre sensor inside a capillary containing the liquid can provide this protection. The liquid can be liquid metal, gel, inks, grease or oil. The liquid metal can be gallium or indium, or an alloy that includes indium and/or gallium. The grease can contain lithium, molybdenum, or synthetics, or be synthetic grease. The liquid can contain other components such as a scavenger or getter for molecules and/or ions.

Cette invention concerne la protection de dispositifs optiques, comme un détecteur optique branché en série avec un câble, dans un milieu hostile, comme ceux que l'on peut rencontrer lors de mesures dans des puits de pétrole et de gaz. Un liquide peut protéger le dispositif optique. On peut obtenir cette protection en enfermant un senseur optique dans un capillaire contenant le liquide. Le liquide peut être du métal liquide, un gel, des encres, de la graisse ou de l'huile. Le métal liquide peut être du gallium ou de l'indium ou un alliage contenant de l'indium et du gallium. La graisse peut contenir du lithium, du molybdène ou des produits synthétiques ou encore, être synthétique. Le liquide peut contenir d'autres produits comme un décrassant ou un getter molécules ou ions.

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