Acoustics – Geophysical or subsurface exploration – Well logging
Patent
1989-02-17
1991-07-16
Lobo, Ian J.
Acoustics
Geophysical or subsurface exploration
Well logging
367 75, G01V 140
Patent
active
050317172
ABSTRACT:
An advanced downhole periodic seismic generator system for transmitting variable frequency, predominantly shear-wave vibration into earth strata surrounding a borehole. The system comprises a unitary housing operably connected to a well head by support and electrical cabling and contains clamping apparatus for selectively clamping the housing to the walls of the borehole. The system further comprises a variable speed pneumatic oscillator and a self-contained pneumatic reservoir for producing a frequency-swept seismic output over a discrete frequency range.
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patent: 4805727 (1989-02-01), Hardee et al.
patent: 4815557 (1989-03-01), Duwe
"Downhole Periodic Seismic Sources", H. C. Hardee, Geophysical Prospecting 31, 57-71, 1983.
"Downhole Seismic Source", H. C. Hardee, G. J. Elbring and B. N. P. Paulsson, Geophysics, vol. 52, No. 6 (Jun. 1987).
"Downhole Seismic Source Performs Well in Field Tests", News Release, Sandia National Laboratories, Jul. 28, 1988.
"Downhole Seismic Signal Tool Ready for Service", Oil and Gas Journal, Aug. 22, 1988, p. 28.
"Downhole Seismic Tool Detects Underground Fluids", Petroleum Engineer International, Dec. 1987, p. 48.
Hardee Harry C.
Hills Richard G.
Striker Richard P.
Hills Richard G.
Lansdowne John R.
Lobo Ian J.
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