Oil well survey tool

Details Oil well survey tool Oil well survey tool

1974-06-13

1976-09-14

Wilbur, Maynard R.

Communications: electrical

Selective

Interrogation response

175 45, 340 155BH, 340 17R, G01V 100, E21B 4702

Patent

active

039809862

ABSTRACT:
A method for finding the position of a drill bit working at the bottom of a borehole comprising sending ultrasonic energy down the drill stem, recording the energy radiated from the drill bit through the earth to an array of geophones around the wellhead on the surface, and calculating the distance from the drill bit to each geophone. The drilling mud surrounding the drill stem absorbs the slight amount of ultrasonic energy that escapes laterally so that substantially all of the effective signal is generated at the bottom of the hole where the drill bit is working.

REFERENCES:
patent: 2062151 (1936-11-01), Weatherby
patent: 3593257 (1971-07-01), Massa, Jr.
patent: 3790930 (1974-02-01), Lamel et al.
patent: 3817345 (1974-06-01), Bailey
patent: 3876016 (1975-04-01), Stinson

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