Title: Resistance sensing free-point tool

Abstract: An improved free-point measuring system for indicating whether a pipe in a borehole is free or stuck at various locations within the borehole is disclosed. The system employs an improved free-point tool in which is mounted a variable resistor having a wiper arm adapted to be displaced with a movement of the pipe. Displacement of the wiper arm causes a change in the resistance of the variable resistor, and this change is detected by a surface unit provided with balancing and calibrating resistors.

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Inventors: Curry, Willie A. (Houma, LA, US)

Application Number: 470558
Filing Date: 1974-05-16
Publication_date: 1976-01-27
Assignee: Fanguy; Jude Thaddeus (Houma, LA)
Primary Class(es): 73/152.56
Other Classes:
US Patent Ref:

2530309	Nov, 1950	Martin	73/151.
2534632	Dec, 1950	Smith	73/152.
2851880	Sep, 1958	Fiedler	73/141.
3670566	Jun, 1972	Basham et al.	73/151.
3762218	Oct, 1973	Davis	73/151.

Other Refs:
Primary Examiner: Queisser, Richard C.
Assistant Examiner: Rasco, Marcus S.
Attorney: McMorrow; Robert G.