E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 47/16 (2006.01) E21B 47/00 (2006.01) E21B 47/04 (2006.01) E21B 47/06 (2006.01) E21B 47/12 (2006.01) G01B 11/16 (2006.01) G01D 5/353 (2006.01) G02B 6/44 (2006.01)
Patent
CA 2244829
The present invention, in certain aspects, discloses a wellbore cable with one or more fiber optic fibers having one or more fiber Bragg gratings thereon or therein. Such a cable is used in a system according to the present invention with an appropriate broadband source, detector system and other items (e. g. but not limited to isolators, couplers, computers, and acoustic transmitters) to measure: the length of a cable in a wellbore, localized temperature in a wellbore, and strain on a cable or other item in a wellbore. Methods have been invented for using such a wellbore cable for such uses. The present invention discloses a wellbore logging cable or wireline with a hollow metal tube through which extends strain-free at least one fiber optic; in one aspect the at least one fiber optic is one, two, three, four or more fiber optics and each has at least one, two, three, four, five or more fiber Bragg gratings; and in another aspect such a cable or wireline has one, two, three, four or more fiber optic outside the hollow metal tube.
Ha Stephen T.
Lopez Josephine
Reuter Fritz W.
Cassan Maclean
Western Atlas International Inc.
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