Borehole seismic pulse generator and system

Details Borehole seismic pulse generator and system Borehole seismic pulse generator and system

1994-04-28

1995-08-01

Lobo, Ian J.

Acoustics

Geophysical or subsurface exploration

Well logging

181113, G01V 1137, G01V 140, G01V 102

Patent

active

054381703

ABSTRACT:
A seismic pulse generator has a tubular outer member telescopically connected to a tubular concentric inner member. The outer member has a port in its sidewall. A force allows telescopic extension from a contracted position to an extended position. An annular well fluid chamber is located between the sidewalls of the inner and outer members in communication with the port. When at the bottom of the well, the inner and outer members are in the contracted position and the well fluid chamber has a large volume. A delay means controls the rate at which the inner and outer members initially move from the contracted to the extended position. Upon lifting the inner and outer members, the delay apparatus causes the inner and outer members to at first move apart slowly, thus allowing the inner and outer members to be raised substantially together. After a predetermined time interval, the delay apparatus allows the force to move the inner and outer members quickly to the extended position. As the inner and outer members quickly move to the extended position, the volume of the well fluid chamber is rapidly reduced. This rapid reduction in volume causes fluid to be ejected from the port in the sidewall of the outer member, causing a seismic pulse to be generated.

REFERENCES:
patent: 2898084 (1959-08-01), Eckel et al.
patent: 3845837 (1974-11-01), McEvers, Jr. et al.
patent: 3993974 (1976-11-01), Silverman et al.
patent: 4003017 (1977-01-01), Bailey
patent: 4207619 (1980-06-01), Klaveness
patent: 4242209 (1981-02-01), Silverman
patent: 4873675 (1989-10-01), Barr, Jr. et al.

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