Downhole seismic source

Details Downhole seismic source Downhole seismic source

1989-10-02

1991-02-12

Jordan, Charles T.

Acoustics

Geophysical or subsurface exploration

Well logging

181113, 181121, G01V 140

Patent

active

049916858

ABSTRACT:
A downhole seismic generator that can be located in various positions in the well including being located in engagement with the bottom of the well bore and that includes a large striker mass driven by compressed gas into engagement with an anvil having one end located in engagement with the medium in which the seismic signals are to be set up. Retractor means is provided to return the mass to the ready position so that a series of seismic signals can be provided as desired. Optional baffle means connected to the generator prevent waves from traveling through the well bore which would otherwise diminish or confuse the seismic shock wave initially generated.
A downhole seismic generator that can be located in various positions in the well including being located in engagement with the bottom of the well bore that includes a vibrator piston located in a reaction mass and driven by a hydraulic system to cause reciprocation of the piston to set up vibrations in the medium to which the lower end of the piston is exposed.

REFERENCES:
patent: 4569412 (1986-02-01), Bouyoucos et al.
patent: 4648478 (1987-03-01), Dedole et al.
patent: 4702343 (1987-10-01), Paulsson
patent: 4747466 (1988-05-01), Jaworski
patent: 4770268 (1988-09-01), Magneville
Paulsson, "Three-Component Downhole Seismic Vibrator", Presented at 58th Annual International SEG Meeting (1988), Expanded Abstracts, 139-142.

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