1 June 2000 Optical fiber telemetry systems for measurement-while-drilling applications
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Two rugged optical fiber telemetry systems for coiled-tubing drilling and other hostile-environment applications are briefly described. One system is a passive uplink; the other is an active simplex link. The transmitter and receiver of the passive uplink are located on the surface. A high-temperature fiber cable connects a serial array of downhole modulators with the surface. Each modulator consists of an intrinsic fiber Bragg grating fixed to a piezoelectric transducer. The simplex link consists of commercial off-the-shelf components: a LED, plastic-clad silica fiber, and a Si pin diode. Both systems performed well when tested at temperatures to 150°C and at vibration levels similar to those downhole. The passive uplink system's performance was unchanged after being tested in actual drilling operations (rotating, drilling, and reaming). The active simplex link's performance was unchanged after being tested at peak vibration levels of 20g. The signal-to-noise ratio of the passive uplinkwas 108 dB/ ?VHz.
R. Stephen Weis, R. Stephen Weis, Brent L. Bachim, Brent L. Bachim, Brad M. Beadle, Brad M. Beadle, Marvin Gearhart, Marvin Gearhart, } "Optical fiber telemetry systems for measurement-while-drilling applications," Optical Engineering 39(6), (1 June 2000). https://doi.org/10.1117/1.602534 . Submission:


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