Downhole seismic sources

Details Downhole seismic sources Downhole seismic sources

1988-12-30

1989-09-05

Steinberger, Brian S.

Acoustics

Geophysical or subsurface exploration

Well logging

181119, G01V 104

Patent

active

048629901

ABSTRACT:
A downhole seismic signal source (vibrational or impulsive) capable of producing a signal of sufficiently high energy to permit the tool to be used in a deep wellbore (exceeding 4000 feet). A piston rod having two pistons reciprocates in an elongated cylindrical housing. An electrohydraulic valve controls the flow of hydraulic fluid to opposite sides of a first piston to control the piston rod's vertical movement. The second piston is positioned between a fluidic spring which balances the pressure of the wellbore fluid and a reservoir of hydraulic fluid which inflates a flexible bladder to produce the seismic signal in the wellbore fluid.

REFERENCES:
patent: 2552970 (1951-05-01), Horsley et al.
patent: 3718205 (1973-02-01), Fair et al.
patent: 3721311 (1973-03-01), Smith
patent: 4215426 (1980-07-01), Klatt
patent: 4396088 (1983-08-01), Bayhi
patent: 4682669 (1987-07-01), Weber
patent: 4697255 (1987-09-01), Howlett
patent: 4722417 (1988-02-01), Selsam
patent: 4773501 (1988-09-01), Bedole et al.

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