Resistance sensing free-point tool

Details Resistance sensing free-point tool Resistance sensing free-point tool

1974-05-16

1976-01-27

Queisser, Richard C.

Measuring and testing

Borehole or drilling

Downhole test

E21B 47024

Patent

active

039344665

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.

REFERENCES:
patent: 2530309 (1950-11-01), Martin
patent: 2534632 (1950-12-01), Smith
patent: 2851880 (1958-09-01), Fiedler
patent: 3670566 (1972-06-01), Basham et al.
patent: 3762218 (1973-10-01), Davis

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