Acoustics – Geophysical or subsurface exploration – Well logging
Patent
1990-12-19
1992-08-04
Eldred, J. W.
Acoustics
Geophysical or subsurface exploration
Well logging
181121, 367 75, G01V 140
Patent
active
051350726
ABSTRACT:
A seismic source for emitting vibrations through rotation of a set of eccentric weights. Two pairs of angularly out-of-phase weights (A1, A2 and C1, C2) rotate in the same direction. One pair of weight (B1, B2) of twice the mass of each of the first pairs of weights (A1, A2 or C1, C2), also angularly out of phase in relation to one another, rotates in the direction opposite to that of the first pairs of weights and at the same speed. All the weights are rotated by electric motors. An electronic set (ME1, ME2) receives control signals (cp1-cp6 and ac1-ac3) representative at any moment of the position of all the weights and out of direction of the generated resulting vibration, and produces electric currents (IMA1-IMA6) driving the motors, as well as currents (ICH, EV) necessary for controlling a hydraulic plant to secure the source against an application wall. The electronic set automatically controls the vibration in order to obtain the desired oscillation direction, frequency and intensity. The seismic source can be used in seismic prospecting in wells.
REFERENCES:
patent: 3195659 (1965-07-01), Goodman
patent: 3999626 (1976-12-01), Adams
patent: 4853906 (1989-08-01), Cole
patent: 4907670 (1990-03-01), Anstey
Eldred J. W.
Institut Francais du Pe'trole
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