Elastic wave exploration tool for wells

Details Elastic wave exploration tool for wells Elastic wave exploration tool for wells

1998-04-14

2000-07-18

Nappi, Robert E.

Acoustics

Geophysical or subsurface exploration

Well logging

181101, 181102, 181106, 181113, 181115, 181117, 181122, 367144, 367162, 367 3, 367 5, 367 82, 367 23, 367 16, 367145, 367146, G01V 140

Patent

active

060893451

ABSTRACT:
A well tool in accordance with the invention comprises an attenuation device which attenuates tube waves associated with an elastic wave emission and/or reception set (1, 12). The attenuation device comprises a bubble generator (2) which releases into the well a gas not readily soluble in the well fluid, slightly overpressured in relation to the hydrostatic pressure, in the form of calibrated bubbles which greatly attenuate the parasitic tube waves. The attenuation device is placed above or below the elastic wave emission and/or reception set having a plurality of pickups whose signals are acquired by a local electronic module (14) and/or a source of elastic waves such as a vibrator. A bubble trap (17) is preferably associated with the bubble generator (2) in order to limit the volume of gas to be generated in situ. The invention is applicable to VSP type seismic prospecting and acoustic logging.

REFERENCES:
patent: 4006794 (1977-02-01), Itria
patent: 4858718 (1989-08-01), Chelminski
patent: 5170018 (1992-12-01), Potier
patent: 5537364 (1996-07-01), Howlett
patent: 5852262 (1998-12-01), Gill et al.

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