Logging probe equipped with a device for immobilizing a set of detectors mounted on joints

摘要

The invention relates to a well logging probe in order to evaluate the underground formations traversed by a drilling. & br / the probe 12 contains a chassis 30 which is free in rotation with respect to the cylindrical body 36 of the probe, and which supports the detection means 40, 50, 60 comprising at least one detector to rotate freely with respect to the frame. The frame is also fitted with braking means 74, 75, 76 which, in the position of rest, are engaged so as to immobilize the said detection means with respect to the cylindrical body 36, and of a solenoid coil 71 which, when it is excited, disengages the braking means. & br / the invention applies in particular to the geophones intended to detect the seismic waves along three orthogonal axes, a vertical, whatever the inclination of the probe. & br / (see appended drawing in bopi) & br / & & br /