Method and apparatus for creating seismic waves in a borehole

Details Method and apparatus for creating seismic waves in a borehole Method and apparatus for creating seismic waves in a borehole

1991-02-14

1992-08-11

Lobo, Ian J.

Acoustics

Geophysical or subsurface exploration

Well logging

G01V 140

Patent

active

051371090

ABSTRACT:
A seismic source for use in a borehole (10) comprises a resonant system (26) which is excited at its resonance frequency while said resonance frequency is caused to vary in controlled manner, thereby performing a frequency sweep. To this end, the pressure inside the enclosure (32) containing the reaction mass (30) of the resonant system (26) is raised to a given initial static pressure by means of a high pressure unit (60), after which the pressure inside the upper chamber (38) of the enclosure (32) is caused to vary according to a substantially sinusoidal law, by means of an electrically controlled valve (52) fed from a low pressure unit (46), while the static pressure is caused to vary regularly via a constriction (74).

REFERENCES:
patent: 3718205 (1973-02-01), Fair et al.
patent: 3909776 (1975-09-01), Broding et al.
patent: 3978940 (1976-09-01), Bouyoucos
patent: 4702343 (1987-10-01), Paulsson
patent: 4715470 (1987-12-01), Paulsson
patent: 4805727 (1989-02-01), Hardee et al.
patent: 4815557 (1989-03-01), Duwe
patent: 4862990 (1989-09-01), Cole

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