Acoustical logging apparatus having signal delay means

Details Acoustical logging apparatus having signal delay means Acoustical logging apparatus having signal delay means

1975-01-22

1976-09-28

Birmiel, Howard A.

Acoustics

Geophysical or subsurface exploration

Well logging

181105, 166241, 175 50, 181 36D, G01V 140

Patent

active

039826066

ABSTRACT:
An acoustical logging apparatus which has a means for interfering with those unwanted signals which inherently travel in the mud between the transmitter and the closest receiver of said apparatus during a logging operation. The signal interference means comprises a rotating sleeve having signal attenuation elements mounted thereon which are adapted to extend to the wall of the borehole to act as a centralizer when the apparatus is in the borehole. These elements are vertically stacked in an overlapped relationship so as to present an obstructed path through the mud for said signals but so as to offer only nominal resistance to displacement of mud as the apparatus is moved therethrough.

REFERENCES:
patent: 2350371 (1944-06-01), Smith
patent: 2606793 (1952-08-01), Suter
patent: 2754160 (1956-07-01), Owen
patent: 3054471 (1962-09-01), Knudsen
patent: 3190388 (1965-06-01), Moser et al.
patent: 3191142 (1965-06-01), Lebourg
patent: 3205941 (1965-09-01), Walker
patent: 3484141 (1969-12-01), Collett
patent: 3560060 (1971-02-01), Morris

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