Downhole seismic source

Details Downhole seismic source Downhole seismic source

1976-02-18

1977-07-05

Birmiel, Howard A.

Acoustics

Geophysical or subsurface exploration

Well logging

181113, 181120, 175 1, 340 155BH, G01V 104, G01V 140

Patent

active

040334295

ABSTRACT:
Disclosed is a seismic source forming part of a drill string which allows geological prospecting while drilling a borehole. The source includes a section of drill pipe having a spiral cam machined into its outer surface and a port for allowing mud to flow from the inside of the drill pipe into the borehole. A sleeve surrounds this section of the drill pipe and includes a cam follower, a plurality of ports, and a spring borehole contact for preventing rotation of the sleeve. The sleeve blocks flow of mud through the drill pipe port, except when a sleeve port is in alignment therewith. When the sleeve cam follower is engaged in the drill pipe cam and the drill pipe is rotated, the drill pipe port follows a helical path relative to the sleeve and sequentially passes all the ports in the sleeve. Signal wave shape is determined by the configuration of the sleeve ports and frequency is determined by the drill pipe rotation rate.

REFERENCES:
patent: 3139146 (1964-06-01), Bodine, Jr.
patent: 3845837 (1974-11-01), McEvers, Jr. et al.

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