Swinging-weight vibrator for seismic exploration

Details Swinging-weight vibrator for seismic exploration Swinging-weight vibrator for seismic exploration

1996-10-03

1998-02-10

Eldred, J. Woodrow

Acoustics

Geophysical or subsurface exploration

Seismic wave generation

367189, 367 75, 181113, G01V 104

Patent

active

057171700

ABSTRACT:
Seismic exploration for hydrocarbons may use an eccentric-mass (or "swinging-weight") vibrator as the seismic source. According to the invention, a vibrator undergoes alternate periods of acceleration and deceleration, during one of which the vibration may be annulled. For example, the rotating mass may be formed in a plurality of parts; then the several parts are disposed in a manner that rapidly and automatically balances their vibratory forces during the period when the vibration is to be annulled, and that adds their vibratory forces during the other period. The invention further provides for modulation of the frequency-time relation during deceleration, for synchronization of several vibrators, and for modulation of the effective output force by controllable variation of the mass, eccentric radius or relative phase of the several parts of the rotating mass; in such modulation, only resultant forces are applied to the vibrator bearings.

REFERENCES:
patent: 4749057 (1988-06-01), Anstey
patent: 4907670 (1990-03-01), Anstey
patent: 4959818 (1990-09-01), Cole
patent: 5135072 (1992-08-01), Meynier
patent: 5166909 (1992-11-01), Cole et al.

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