Method and apparatus for logging inclined earth boreholes

Details Method and apparatus for logging inclined earth boreholes Method and apparatus for logging inclined earth boreholes

1978-10-02

1980-03-11

Novosad, Stephen J.

Wells

Processes

With indicating, testing, measuring or locating

166 65R, 166104, 2541345, E21B 4700

Patent

active

041923804

ABSTRACT:
Apparatus for aiding a well logging instrument in traversing highly deviated boreholes including a plurality of extensible arms mounted in the elongated logging instrument, each arm terminating in a pad member which includes a toothed wheel or gear mounted therein but extending outside the pad. When the arms are extended, moving the pad members outward and away from the logging instrument toward the borehole wall, the toothed wheels engage the mud cake or the borehole wall. A motor is effectively connected to the toothed wheels through a plurality of shafts, universal joints and interconnecting gears for rotating the toothed wheels to move the logging instruments up or down the borehole length. By mounting the toothed wheels within the pad members at an angle other than parallel to the axis of the borehole such that an auger-like movement of the logging instrument is produced, the drive force exerted on the logging instrument is amplified.

REFERENCES:
patent: 1177984 (1916-04-01), Beene
patent: 2742259 (1956-04-01), Boucher
patent: 2776564 (1957-01-01), Montgomery et al.
patent: 2871946 (1959-02-01), Bigelow
patent: 2876413 (1959-03-01), Saurenman et al.
patent: 3375885 (1968-04-01), Scott et al.
patent: 3405772 (1968-10-01), Wisenbaker et al.
patent: 3890905 (1975-06-01), Clavin
patent: 4031750 (1977-06-01), Youmans et al.

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