Method for deploying extendable arm for formation evaluation MWD

Details Method for deploying extendable arm for formation evaluation MWD Method for deploying extendable arm for formation evaluation MWD

1990-12-17

1993-09-07

Lobo, Ian J.

Wells

Processes

With indicating, testing, measuring or locating

175 50, E21B 4712

Patent

active

052420205

ABSTRACT:
An extending arm is incorporated into a formation evaluation MWD collar or sub for extending outwardly from the tool and maintaining direct and continuous contact with the borehole wall (e.g., formation). In accordance with this invention, a method is presented for intermittently deploying the extendable arm and thereby decreasing drilling interference (caused by the arm) and avoiding the damage caused by accidents involving a nuclear source.

REFERENCES:
patent: 3800277 (1974-03-01), Patton et al.
patent: 4226116 (1980-10-01), Denison
patent: 4716973 (1988-01-01), Cobern
patent: 4881406 (1989-11-01), Coury

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