Anordning for undersökelse av en undergrunnsformasjon som gjennomskjæres av en horisontal brönn

摘要

- the invention relates to a device for scanning of an underground formation traversed by a well at least strongly deflected in relation to the vertical. & br / - it comprises a plurality of rigid exploration modules (mi) interconnected end to end, each module comprising a tube (1), a probe placed inside the tube, which contains one or more sensors and which is provided with an anchor arm, the means for guiding the probe radially between a rest position and a working position that is eccentric in which it can be pressed against the wall of the well through openings provided in the wall of each tube, when it is moved by the opening of the arm, the means of acoustic decoupling between the probe and the guide means, a transmission system comprising the connecting cables multi - conductors connecting the various sondes connected to a central station (40) on the surface, by means of a connecting block (26) comprising means of a deferred electric connection in a wet medium, and a system for the acquisition and transmission, and a rigid column connected to means for operating on the surface to drive the exploration assembly into the said portion of the well. (br / - application to the seismic prospection, for example.