FIELD: oil producing industry.
SUBSTANCE: invention relates to well pumping units for production of oil.
Proposed unit contains packer, tubing string and jet pump in housing of which active nozzle with mixing chamber is installed and through channel with seat for sealing unit with axial channel is made. Jet pump output is connected to tubing string higher than sealing unit, input of jet pump pumped out medium supply channel is connected to tubing string lower than sealing unit, and input of channel delivering working medium into active nozzle is connected to space around tubing string. Several channels to supply pumped out medium are made in jet pump housing. Working medium supply channel communicates with space around tubing string through perforated wall of jet pump housing. Ring groove is made on jet pump housing. Perforated wall of housing is made in base of ring groove. Width of groove is not less than height of perforated wall of jet pump housing. And summary area of perforation holes is not less area of cross section of channel delivering working medium to active nozzle input.
EFFECT: improved reliability of plant owing to prevention of failure caused by closing (clogging) of section of jet pump active nozzle by foreign objects.
4 cl, 1 dwg
