Acoustics – Geophysical or subsurface exploration – Well logging
Patent
1986-05-16
1991-06-11
Lobo, Ian J.
Acoustics
Geophysical or subsurface exploration
Well logging
181104, 181105, G01V 140
Patent
active
050224840
ABSTRACT:
Method and apparatus for applying the measuring pads of a logging sonde against the walls of a borehole. Dip measurements and geological investigation of earth formations traversed by a deviated borehole require that the measuring pads be pressed against the borehole walls by means of articulated arms which maintain the pads symmetrical and parallel with respect to the sonde. In the preferred embodiment, two independent resilient forces are applied to the pads. The first resilient force is substantially constant at all extensions of the arms in the borehole, while the second resilient force is adjustable to suit local parameters. The second resilient force is preferably adjustable from surface instrumentation while the sonde is making measurements in the borehole. The first resilient force is provided by independent leaf springs acting on each of the pads, while the second resilient force is preferably provided by a coil spring acting on each of the pairs of opposing arms. A flexible joint may be used between the cartridge and sonde sections of the logging tool to reduce the total weight bearing down upon the pads.
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Panetta Pascal
Tromelin Jacques
Lee Peter Y.
Lobo Ian J.
Pojunas Leonard W.
Schlumberger Technology Corporation
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