FIELD: engineering of well jet plants for logging operations.
SUBSTANCE: plant contains jet pump and a packer mounted on pipes column. Body of jet pump contains stepped through channel, channel for supplying substance to be drained, connected to stepped channel, and channel for feeding active working substance, connected at outlet to active nozzle and at inlet to annular space. Channel for feeding drained substance is connected through reverse valve to pipes column below the stepped channel. In the latter it is possible to install a sealing unit in form of a hollow stepped cylindrical case. In upper part of the sealing unit case a packing element is positioned, and below it a spring-loaded stepped piston is positioned with a stop against circular shelf. In the case of sealing unit apertures are made in front of apertures of jet pump body. In lower position the piston closes the apertures of sealing unit body, and in upper position the channel for supplying substance drained from the well through apertures of bodies of jet pump and sealing unit is connected to pipes column below the body of jet pump. In the piston and packing element coaxial channels are made for letting through a cable with logging equipment suspended below the body of jet pump.
EFFECT: increased reliability of operation due to prevented draining of working liquid into sub-packer space.
2 cl, 2 dwg
