Abstract: A system intended for permanent installation of measuring sondes against the inner wall of a pipe (1) such as a well or a tube. Measuring sondes (7) are respectively associated with coupling devices (2) that are brought to their respective coupling points in the pipe by means of a tube (3) positioned by off-centering devices (4) for example. Each coupling device (2) comprises a flexible element (6) carrying sonde (7), that is deformed to a set back position where it is immobilized by a lock (9) so as to allow displacement thereof along pipe (1). In order to release flexible blades (6), a sufficient overpressure allowing to push back the piston of a jack (10) whose cylinder communicates at one end with the inside of pipe (1) is established. In this expanded position, it immobilizes coupling device (2) and presses sonde (7) against pipe (1) while mechanically decoupling it from tube (3). Tube (3) can possibly be withdrawn if it does not serve another purpose.

Abstract: A system and method for displacing instruments in a pipe having a portion thereof which is greatly inclined to the vertical. The system comprises in combination: a set of instruments mechanically linked to a first end of an electrically-powered displacement device, a semi-rigid composite rod that can be wound round a drum and at least one electric conductor. The method includes advancing the displacement device using the rod uncoiling from the drum. The system and method is of special use in inclined oil wells.