Apparatus for measuring the diameter of a well bore

Details Apparatus for measuring the diameter of a well bore Apparatus for measuring the diameter of a well bore

1975-07-16

1977-02-08

Aegerter, Richard E.

Geometrical instruments

Area integrators

Electrical

E21B 4708

Patent

active

040065308

ABSTRACT:
In the representative embodiments of the apparatus of the present invention disclosed herein, a plurality of outwardlybiased bow springs are disposed around a tool body and cooperatively arranged for centering the tool body in a well bore. The upper ends of the bow springs are pivotally secured to an intermediate portion thereof and their lower ends coupled together for longitudinal movement in relation to the lower portion of the body. To maintain the bow springs at a uniform spacing from the tool body when the tool is in a deviated well bore, a corresponding number of rigid arms are pivotally coupled to the mid-portion of each spring and extended upwardly to a pivotal connection on a collar which is slidably mounted on the tool body and biased downwardly. Diameter-measuring devices are cooperatively arranged on the tool body for operation in response to the expansion and retraction of the bow springs.

REFERENCES:
patent: 1708354 (1929-04-01), Cabot
patent: 2787839 (1957-04-01), Taylor
patent: 2892258 (1959-06-01), Adamson
patent: 3044175 (1962-07-01), Broome et al.
patent: 3323612 (1967-06-01), Patterson et al.
patent: 3555689 (1971-01-01), Cubberly

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