Wells – Guide for device or conduit – On sucker or pump rod
Patent
1987-11-06
1988-12-13
Novosad, Stephen J.
Wells
Guide for device or conduit
On sucker or pump rod
73151, 166 64, E21B 1710
Patent
active
047903813
ABSTRACT:
A centralizing device for use down-well in maintaining a sensor or other operational tool in a location accurately centralized on the axis of the bore-hole irrespective of the angular orientation of the device and associated tool at any given location. The device includes an elongate member carrying at angularly spaced locations three two pairs of opposed, two-arm linkages, each arm of each linkage being pivoted to the other arm of that linkage at a location spaced from the elongate member when in an extended position and being pivoted at the other end of the arm to a respective one of two slide blocks each of which is movable axially of the elongate member. Resilient springs act on the slide blocks so as to bias the arms of each linkage towards one another whereby the common pivot axes of the arms are moved away from the elongate member, and rollers or anti-friction members are mounted at the pivot of each linkage of each pair of arms so that the device as a whole can move with minimum friction within the pipe or tube containing the device.
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Drexel Equipment (U.K.) Limited
Novosad Stephen J.
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