Determining downhole clock drift

A technique is presented for determining the drift of a clock adapted for subsurface disposal. Seismic signals are transmitted through the subsurface medium from an uphole location 14 at selected times, acoustic signals associated with the transmitted seismic signals are received with acoustic senso...

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Bibliographic Details
Main Authors ANTHONY L COLLINS, ANDREW HAWTHORN, CENGIZ ESMERSOY
Format Patent
LanguageEnglish
Published 16.06.2004
Edition7
Subjects
DETECTING MASSES OR OBJECTS
GEOPHYSICS
GRAVITATIONAL MEASUREMENTS
MEASURING
PHYSICS
TESTING
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Summary:A technique is presented for determining the drift of a clock adapted for subsurface disposal. Seismic signals are transmitted through the subsurface medium from an uphole location 14 at selected times, acoustic signals associated with the transmitted seismic signals are received with acoustic sensors 30 at identified downhole locations. First and second transit times for acoustic signals received at an identified downhole reference location are determined using the clock. A time difference between the first and second signal transit times at the reference point is calculated to determine the clock drift.
Bibliography:Application Number: GB20030021275