FIELD: oil producing industry, pumping equipment.
SUBSTANCE: proposed plant contains jet pump and packer. Through stepped channel with seat is made in housing of jet pump and also channel to supply medium pumped out of well communicating with stepped channel lower than its seat and channel to supply active working medium communicating with active nozzle of jet pump. Channel to supply pumped out medium communicates through check valve with tubing space lower than stepped channel. Sealing unit in form of hollow stepped cylindrical housing is installed in stepped channel. Sealing member is arranged in upper part of housing space, and stepped piston is installed lower, to thrust against ring step in space of sealing unit housing. Stepped piston is spring-loaded relative to sealing member. Holes are made in housing of sealing unit opposite to bypass holes of housing of jet pump. Piston, in its lower positions, overlaps holes in wall of housing of sealing unit, and it upper position, communicates channel to supply pumped out medium with space of tubing lower than housing of jet pump. Axial channels are made in piston and sealing member to pass logging cable.
EFFECT: improved reliability of operation owing to prevention of overflow of liquid into underpacker space of well when operations are stopped.
3 cl, 2 dwg
