Distributed seismic energy source

Details Distributed seismic energy source Distributed seismic energy source

1991-06-21

1992-05-05

Lobo, Ian J.

Acoustics

Geophysical or subsurface exploration

Well logging

367 57, 181104, G01V 140

Patent

active

051099470

ABSTRACT:
A drill string in a fluid-filled borehole acts as a waveguide for an extensional wavefield that is generated in the drill string when it is excited by the vibrations of a drill bit secured to the lower end of the drill string. The waveguide acts as a distributed acoustic energy source which initiates head waves in the surrounding formation. The head waves are detected at one or more discrete locations near the surface of the earth. The extensional wavefield is detected by a sensing means mounted at the top of the drill string. The detected head waves are cross-correlated with the detected extensional waves to create a cross-correlogram which may be displayed.

REFERENCES:
patent: 4718048 (1988-01-01), Staron et al.
patent: 4829489 (1989-05-01), Rector
patent: 4862423 (1989-08-01), Rector
patent: 4965774 (1990-10-01), Ng. et al.
patent: 5031158 (1991-07-01), Chamuel
Dareing, D. W., "Vibrations increase available power at the bit", Technology, Oil & Gas Journal, Mar. 5, 1984.

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