A guiding system for driving a non rigid exploration device in wells where progression by gravity is difficult includes a tubular column for guiding the displacement of the device which includes a plurality or set of sondes joined together by non-rigid connecting means into a deflected well zone. A first sonde of the set is at least fitted with anchoring arms and its cross-section and possibly that of all the remaining sondes of the set can be larger than the cross-section of the tubular column. In this case, a more or less long protective housing is provided at the end of the column. A delayed electric connection device for the set of sondes linked to a surface laboratory is utilized. The first sonde is pushed out of the column by a fluid pressure and anchoring arms of the first sonde are opened. The tubular column is pulled backward and upward in order to make the plurality of sondes to come out of the column and to be positioned in the well and, thereafter, measuring cycles are carried out.