Downhole seismic source

Details Downhole seismic source Downhole seismic source

1976-01-26

1977-08-02

Moskowitz, Nelson

Communications: electrical

Selective

Interrogation response

340 18NC, 181106, 175 40, G01V 140

Patent

active

040400034

ABSTRACT:
A downhole seismic source for use when drilling a borehole in the earth using a rotating drill string through which a drilling fluid is circulated. In one embodiment, a section of the drill string has a slot in it and a sleeve rotatably surrounding the slot with a plurality of spaced-apart slots arranged to align with the slot in section of drill pipe during rotation of the sleeve with respect to the section. In operation this generates a controlled seismic signal. In another embodiment the bit is modified to have a fluid passage with a valve therein that opens and closes in a selected pattern during rotation of the drill bit.

REFERENCES:
patent: 2422031 (1947-06-01), Merten
patent: 2560328 (1951-07-01), Biblstein
patent: 2652232 (1953-09-01), Holland
patent: 3813656 (1974-05-01), Fowler
patent: 3853184 (1974-12-01), McCullough
patent: 3876016 (1975-04-01), Stinson

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