| 摘要 |
A wellbore cable 100 has one or more fiber optic fibers 120,126 with one or more fiber Bragg gratings (127,129, Fig 3D) thereon or therein. Such a cable can be used in a system with an appropriate broadband source, detector system and other items (e.g. 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. A wellbore logging cable may have a hollow metal tube 118 through which extends strain-free at least one fiber optic. Copper conductors 112,113 are shown. |
