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 to active nozzle is connected to space around tubing. Several channels to supply pumped out medium are made in jet pump housing. Two-step ring groove is made on jet pump housing. Larger step of groove is made from side of outer wall of jet pump housing. Inlet section of channel delivering working medium to active nozzle is made in base of smaller step of ring groove. Perforated shell is installed in larger step of rings groove. Height of shell is equal to width of larger step of ring groove. Thickness of shell wall is not greater than depth of larger step of ring groove, and summary area of perforation holes of shell is not less than area of cross section of channel delivering working medium to active nozzle input.
EFFECT: improved reliability of well jet unit in operation.
3 cl, 1 dwg
