Geometrical instruments – Indicator of direction of force traversing natural media – Borehole direction or inclination
Patent
1984-12-31
1986-02-18
Little, Willis
Geometrical instruments
Indicator of direction of force traversing natural media
Borehole direction or inclination
33304, 33308, 33318, E21B 47022
Patent
active
045703531
ABSTRACT:
An apparatus and method for preventing damage to the mechanical components of a borehole inclinometer is disclosed. The inclinometer uses a freely suspended pendulum to align with the vertical at a selected position in the borehole. A compass connected to the pendulum rotates to an orientation defined by the earth's magnetic field. To protect the components which suspend the pendulum, the pendulum is clamped between a timer and a lens as the inclinometer is lowered into the borehole. At a selected time, the pendulum is unclamped and is permitted to reach an equilibrium, measuring position. After a selected interval, the timer urges the pendulum against the lens to clamp the pendulum. The inclinometer is raised from the wellbore, and the orientation of the pendulum relative to the lens is observed to determine the azimuth and inclination of the borehole.
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"Magnetic Single Shot Survey Instrument" Scientific Drilling Control, (no date).
"Mechanical Drift Indicator", Eastman Whipstock Publication, (no date).
Evans John L.
Russell Larry R.
Atkinson Alan J.
Exxon Production Research Co.
Little Willis
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