ARRAY TEMPERATURE SENSING METHOD AND SYSTEM
First Claim
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1. An apparatus for monitoring a condition in a well-bore, comprising:
- first and second sensors spaced along a length of an optical waveguide, wherein the first and second sensors are formed respectively within first and second enlarged outer diameter portions of the waveguide relative to an interconnecting portion of the waveguide between the sensors; and
a conduit surrounding the waveguide and spanning the length of the waveguide.
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Abstract
Methods and apparatus enable monitoring conditions in a well-bore using multiple cane-based sensors. The apparatus includes an array of cane-based Bragg grating sensors located in a single conduit for use in the well-bore. For some embodiments, each sensor is located at a different linear location along the conduit allowing for increased monitoring locations along the conduit.
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Citations
25 Claims
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1. An apparatus for monitoring a condition in a well-bore, comprising:
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first and second sensors spaced along a length of an optical waveguide, wherein the first and second sensors are formed respectively within first and second enlarged outer diameter portions of the waveguide relative to an interconnecting portion of the waveguide between the sensors; and a conduit surrounding the waveguide and spanning the length of the waveguide. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15-21. -21. (canceled)
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22. An apparatus for monitoring a condition in a well-bore, comprising:
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a plurality of Bragg grating optical sensors disposed along a length of an optical waveguide, wherein the sensors are connected to one another by fiber portions of the waveguide having an outer diameter that is smaller than an outer diameter of the sensors; a protective tubing surrounding the length of the waveguide; and an armor layer surrounding the protective tubing. - View Dependent Claims (23)
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24. (canceled)
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25. A method of surveying temperature in a borehole, comprising:
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deploying a conduit surrounding a length of an optical waveguide defining a plurality of optical sensors disposed along the length into the borehole, wherein the sensors are connected to one another by portions of the waveguide having an outer diameter that is smaller than an outer diameter of the sensors; and determining temperatures along the borehole based on responses from the optical sensors.
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Specification