Importance

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Abstract

The invention relates to a device for exploring an underground formation crossed by a well inclined significantly to the vertical. It comprises a plurality of rigid exploration modules (Mi) interconnected end to end, each module including a tube (1), a sonde placed inside the tube, containing one or more sensors and provided with an anchor arm, a guide for guiding the sonde radially between a position of rest and an eccentric working position where it can be pressed against the wall of the well through openings provided in the wall of each tube when it is shifted by opening of the arm, an acoustic decoupler between the sonde and the guide, a transmission system including multiconductor linking cables connecting the various sondes together and connected to a surface central station (40) by a connecting block (26) comprising a deferred electric connection under humid conditions and of an acquisition and transmission system, and a rigid string connected to a surface operating device for driving the exploration assembly into the portion. The invention can be used for seismic prospecting.

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First Claim