Geometrical instruments – Area integrators – Electrical
Patent
1980-03-31
1981-12-01
Little, Willis
Geometrical instruments
Area integrators
Electrical
33149J, G01B 712, G01B 728
Patent
active
043028810
ABSTRACT:
A well conduit caliper tool which simultaneously measures the remaining wall thickness of a well conduit in situ and the minimum inside diameter of such conduit. A caliper feeler arm element which extends out the furthermost distance from the caliper tool activates a sensing element that produces the indication of remaining conduit wall thickness. Another caliper feeler arm element which extends out the least distance from the caliper tool activates another sensing element that produces the indication of the minimum inside diameter. At the earth's surface these indications are recorded on a continuous strip chart or log as the variation of such respective diameters through the interval of conduit measured by the caliper tool. Mechanical linkage wear compensation and linear mechanical movement through the linkage between the feeler arm elements and the sensing elements are provided.
In conjunction with the caliper tool is a diameter calibration apparatus and method including a calibration tube adapted to fit about the caliper tool at the earth's surface. The calibration tool provides designated simulated remaining wall thickness and simulated minimum internal diameters as standards from which the caliper tool is calibrated at the earth's surface.
REFERENCES:
patent: 2695456 (1954-11-01), Roberts
patent: 2795856 (1957-06-01), Reesby et al.
patent: 2810203 (1957-10-01), Bachofer
patent: 2925660 (1960-02-01), Raulins
patent: 2927377 (1960-03-01), McMahan
patent: 3259990 (1966-07-01), Key, Jr.
Hallmark Bobby J.
Schwind Edward C.
Dautremont James H.
Gearhart Industries, Inc.
Little Willis
Peppers James M.
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