Inertial borehole survey system
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United States of America Patent
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-
Jun 19, 1984
Grant Date -
N/A
app pub date -
Nov 18, 1982
filing date -
Nov 18, 1982
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A system and method for surveying, with accuracies better than one foot per thousand feet of depth, very deep boreholes having the attendant small diameters, high temperatures and high pressures with very high accuracy. A downhole probe is used having a small diameter, less than about four inches. Three linear type accelerometers and at least two gyros to provide three sensitive axes are fixedly mounted at points spaced along the axis of an elongated, rigid, thermally conductive support member to form an instrument cluster. Signals from these instruments are then processed and transmitted serially over a conductor of a conventional wireline to the surface unit where a surface computer continuously computes and records the current position of the instrument.
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