Device for generating acoustic waves by causing a falling mass t

Details Device for generating acoustic waves by causing a falling mass t Device for generating acoustic waves by causing a falling mass t

1989-03-27

1990-05-08

Steinberger, Brian S.

Acoustics

Geophysical or subsurface exploration

Well logging

181121, 367911, G01V 140

Patent

active

049230301

ABSTRACT:
A device for generating acoustic waves in a well by causing a mass falling inside a body to strike a target element and to transmit impacts to the surrounding geological formations by anchoring the body in the well by retractable shoes. A tractive force exerted on the support cable from the surface, after anchorage of the body, causes a support element to move upwards which takes the target element and the mass with it. When the mass is hydraulically locked in its set position, the cable is slackened so that the target element and the support element can come back to the bottom position. In this position, the support element presses on a pusher element which actuates hydraulic locking and releases the mass.

REFERENCES:
patent: 4770268 (1989-09-01), Magneville
patent: 4773501 (1988-09-01), Dedole et al.
patent: 4796723 (1989-01-01), Laurent et al.
patent: 4815557 (1989-03-01), Duwe

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