Patent ID: 7929812
Filing Date: 2011-04-19
Classification: E21B

Abstract:
1. A method of communication between a surface location and at least one downhole tool using an electro-optical telemetry system, comprising: generating a first light at a first light wavelength (λdown); generating a second at a second light wavelength (λup); modulating the first light with an uphole EO modulator to form an optical downlink data signal; sending the optical downlink data signal to the at least one downhole tool via a single optical fiber; converting the optical downlink data signal into an electrical data signal with a downhole OE demodulator; obtaining a measurement of a downhole parameter with at least one sensor disposed in the at least one downhole tool; converting an electrical signal corresponding to the measurement of the downhole parameter into an optical signal by modulating the second light with a downhole EO modulator; sending the modulated light to the surface location via the single optical fiber; and converting the modulated light into an electrical signal at the surface location with an uphole OE demodulator.