Logging probe equiped of pads for measuring a wide angular field of observation

摘要

In order to increase the angular field of observation of a logging sonde (10) usable, in particular for dip metering, the sonde is equipped with measuring pads (14) each comprising two independent flaps (14a, 14b). The flaps of the same pad are hinged to a central element which is held permanently parallel to the axis (XX') of the sonde body (12), and they are applied against the wall of a borehole (A) by blade springs (22). Each of the flaps (14a, 14b) carries an array of electrodes (24). The flaps (14a, 14b) of each of the measuring pads are circumferentially offset relative to each other so that the angular field of observation is increased without increasing the diameter of the sonde, once the pads have been retracted.