Well probe able to be uncoupled from a rigid coupling connecting it to the surface

Well probe lowered into a well and joined to a rigid coupling such as a tubular column and able to be mechanically uncoupled from the latter. The probe comprises two offset shoes (5 and 6) fixed outside the column (7) and an intermediate shoe (7) provided with a central passage (9) larger than the column. The 51 intermediate shoe is connected to the lower offset shoe by a mobile hasp. It comprises a cavity for a mobile harness (15) able to be moved between one contraction position and one position for coupling with the wail of the well under the action of springs. The mobile harness comprises a casing for the sensors (19-21) and hydraulic triggering means (32). The sensors and the hydraulic means are connected to a surface laboratory by means of cables and one electronic cartridge. The intermediate shoe is fitted in such a way that it no longer touches the column 4 in the anchorage position of the mobile harness. The probe may be associated with a well equipped for the production of hydrocarbons, for example.