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Optical Engineering

Optical fiber telemetry systems for measurement-while-drilling applications
Author(s): R. Stephen Weis; Brent L. Bachim; Brad M. Beadle; Marvin Gearhart
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Paper Abstract

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.

Paper Details

Date Published: 1 June 2000
PDF: 6 pages
Opt. Eng. 39(6) doi: 10.1117/1.602534
Published in: Optical Engineering Volume 39, Issue 6
Show Author Affiliations
R. Stephen Weis, Texas Christian Univ. (United States)
Brent L. Bachim, Texas Christian Univ. (United States)
Brad M. Beadle, Georgia Inst. of Technology (United States)
Marvin Gearhart, RockBit International, Inc. (United States)

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