TFL Caliper

Details TFL Caliper TFL Caliper

1979-07-02

1981-02-03

Stearns, Richard R.

Geometrical instruments

Area integrators

Electrical

G01B 512, G01B 528

Patent

active

042479851

ABSTRACT:
A "feeler" type caliper for through the flow line (TFL) use in wells for indicating and recording maximum radius within the well flow conductor. The caliper has an improved arrangement of feelers and springs for centering the caliper within the well flow conductor and is articulated to pass through a five-foot radius loop. The caliper comprises a drive mechanism housing a plurality of drive wheels which track the inside of the tubing in a helical path; a sensing mechanism housing a plurality of spring loaded feeler arms which, when the caliper travels upward in the well flow conductor, are in a biased touching relation to the bore wall of the well flow conductor, each being free to be urged outwardly into recesses in the bore wall of the well flow conductor, such outward travel being sensed in a recording mechanism, the recording mechanism being operated by said drive mechanism to record maximum inside radius of the well flow conductor, versus distance traveled along the well flow conductor.

REFERENCES:
patent: 2518663 (1950-08-01), Chaney et al.
patent: 2567548 (1951-09-01), Chaney et al.
patent: 2596924 (1952-05-01), Fredd
patent: 2708316 (1955-05-01), Fredd
patent: 2789357 (1957-04-01), Schramm
patent: 2879604 (1959-03-01), Chaney et al.

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