Acoustics – Geophysical or subsurface exploration – Well logging
Patent
1986-03-18
1987-12-29
Jordan, Charles T.
Acoustics
Geophysical or subsurface exploration
Well logging
181108, 181113, 181121, 367 75, 367189, G01V 140
Patent
active
047154705
ABSTRACT:
The present invention is a downhole seismic source capable of generating seismic forces in excess of 1000 newtons. The source produces seismic waves for seismic applications, particularly cross borehole measurements and vertical seismic profiling. Coupled with motion sensing devices, the present invention also performs as a seismic logging tool. The source is comprised of an outer housing, a means for clamping the source securely to the wellbore, and a linear electromagnetic actuator which utilizes permanent magnetic material having remanent magnetic field exceeding about 0.9 T such as rare earth permanent magnetics. The source has a diameter of about 12.5 cm to fit within a typical wellbore and the actuator has a length of about 1 meter.
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H. C. Hardee, "Downhole Periodic Seismic Sources, Geophysical Prospecting 31, 57-71, 1983.
P. A. Heelan, S. J., "Radiation from a Cylindrical Source of Finite Length", Geophysics, vol. 18, 1953, pp. 685-696.
Chevron Research Company
Eldred John W.
Jordan Charles T.
Keeling E. J.
LaPaglia S. R.
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