Method of using a heater with a fiber optic string in a...

E - Fixed Constructions – 21 – B

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Details

E21B 36/04 (2006.01) E21B 47/06 (2006.01) E21B 47/10 (2006.01) E21B 47/12 (2006.01)

Patent

CA 2342139

The present invention provides a heater cable (10) that may be deployed in a wellbore to elevate the temperature of the wellbore above the temperature of the surrounding fluid and the formation. One or more fiber optic strings are included in or are carried by the heater cable. The heater cable carrying the fiber optics is placed along the desired length of the wellbore. At least one fiber optic string measures temperature of the heater cable at a plurality of spaced apart locations. Another string may be utilized to determine the temperature of the wellbore. In one aspect of this invention, the heater cable is heated above the temperature of the wellbore. The fluid flowing from the formation to the wellbore lowers the temperature of the cable at the inflow locations. The fiber optic string provides measurements of the temperature along the heater cable. The fluid flow is determined from the temperature profile of the heater cable provided by the fiber optic sensors.

L'invention concerne un câble chauffant (10) déroulable dans un puits de forage utilisé pour y augmenter la température de façon que la température du puits de forage soit supérieure à celle du liquide environnant et à celle de la formation. Le câble chauffant qui comporte et achemine au moins un fil à fibres optiques, est placé sur toute la longueur voulue du puits de forage. Au moins un fil à fibres optiques mesure la température du câble chauffant à plusieurs emplacements distincts. On peut utiliser un autre fil pour déterminer la température du puits de forage. Dans un mode de réalisation de cette invention, le câble chauffant est chauffé à une température supérieure à celle du puits de forage. Le liquide, qui s'écoule de la formation vers le puits de forage, diminue la température du câble aux emplacements d'entrée. Le fil à fibres optiques permet d'obtenir des mesures de la température le long du câble chauffant. On détermine le débit du liquide à partir du profil des températures du câble chauffant, généré par les capteurs à fibres optiques.

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