Hydraulic pressure propelled device for making measurements and interventions during injection or production in a deflected well

A device useful for carrying out, during a fluid production or injection operation, measurements or interventions in a deflected well passing through a geological formation and being equipped with tubing, said device comprising at least one measuring or intervention instrument, an extension having an upper end provided with means for supporting sealing members allowing propulsion of the device in said tubing under the effect of a hydraulic pressure and another end fixed to the instrument, said device being connected to the surface by a flexible support line and having a propulsion position in the tubing as well as a measuring or intervention position;

• said support means comprising two elongate members, one of the elongate members being fixed to the upper end of said extension, extending above said sealing members and defining a flow passage which leads from at least one opening therein situated above the sealing members to at least another opening therein situated below the sealing members and the other elongate element being mobile and having at least one opening therein situated above the sealing members and being capable of being moved by sliding with respect to said upper end of said extension from a propulsion position in which the at least one opening in the fixed elongated element situated above the sealing members is closed to a measuring or intervention position in which the at least one opening in the fixed elongated element situated above the sealing members is uncovered thereby allowing a fluid to flow and to pass through said passage and through said elongated elements during injection or production of the fluid.