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US 10,365,537 B1Granted
Directional sensitive fiber optic cable wellbore system
AssigneeSaudi Arabian Oil Company
InventorsDamian Pablo San Roman Alerigi, Frode Hveding
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Abstract
A fiber optic cable assembly includes an elongate housing, a signal fiber placed inside the housing and extending longitudinally, and a plurality of sensing fibers placed inside the housing and extending longitudinally. The plurality of sensing fibers is placed around the signal fiber. Each of the plurality of sensing fibers carries a respective laser signal of a distinct frequency. The signal fiber carries one or more evanescent coupling signals responsive to the laser signals in the plurality of sensing fibers.
Claims11
A fiber optic cable assembly, comprising:
- an elongate housing;
- a signal fiber placed inside the housing and extending longitudinally;
- a strap to secure the fiber optic cable assembly outside a tubing in a wellbore formed in a formation;
- and
- a plurality of sensing fibers placed inside the housing and extending longitudinally, wherein the plurality of sensing fibers are placed around the signal fiber, each of the plurality of sensing fibers carries a respective laser signal of a distinct frequency, and the signal fiber carries one or more evanescent coupling signals responsive to the laser signals in the plurality of sensing fibers.
2 more elements
Dependencies are inferred from the claim text.