Acoustics – Geophysical or subsurface exploration – Well logging
Patent
1990-04-19
1992-05-19
Eldred, J. Woodrow
Acoustics
Geophysical or subsurface exploration
Well logging
181113, 181121, 367912, G01V 140
Patent
active
051139669
ABSTRACT:
A downhole hydraulic seismic generator system for transmitting energy wave vibrations into earth strata surrounding a borehole. The system contains an elongated, unitary housing operably connected to a well head aboveground 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 hydraulic oscillator containing a double-actuating piston whose movement is controlled by an electro-servovalve regulating a high pressure hydraulic fluid flow into and out of upper and lower chambers surrounding the piston. The spent hydraulic fluid from the hydraulic oscillator is stored and pumped back into the system to provide high pressure fluid for conducting another run at the same, or a different location within the borehole.
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patent: 4805727 (1989-02-01), Hardee et al.
H. Hardee, "Downhole Periodic Seismic Sources", Geophysical Prospecting, vol. 31, 1983, pp. 57-71.
H. Hardee et al., "The Resonant Acoustic Pulser--A Continuous Frequency Marine Seismic Source", Geophysics, vol. 48, No. 8, Aug. 1983, pp. 1082-1089.
H. Hardee et al., "Probing The Melt Zone of Kilauea Iki Lava Lake, Kilauea Volcano, Hawaii", Geophysical Research Letters, vol. 8, No. 12, Dec. 1981, pp. 1211-1214.
H. Hardee et al., "Downhole Seismic Source", Geophysics, vol. 52, No. 6, Jun. 1987, pp. 729-739.
Ser. No. 312,683 filed Feb. 17, 1989 by Hardee et al.
Gregory Danny L.
Hardee Harry C.
Smallwood David O.
Chafin James H.
Daniel Anne D.
Eldred J. Woodrow
Moser William R.
The United States of America as represented by the United States
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