FIELD: pumping facilities.
SUBSTANCE: proposed well jet pumping unit contains packer, tubing string with support in which bypass ports are made and on which jet pump in housing is installed. Channel to supply active medium into jet pump nozzle, channel to supply well pumped out medium into jet pump, and channel to let out media mixture from jet pump are made in housing. Through channel made in housing over pumped out medium supply channel communicates with said channel and it is provided with seat for mounting sealing unit. Axial channel made in sealing unit to pass cable through axial channel and pumped out medium supply channel for mounting instruments and equipment on said cable in well below jet pump and their movement along well shaft both when jet pump is operating or idling. Channel to supply active medium into jet pump nozzle communicates with bypass ports and, through the latter, with space around tubing string. Channel to let out media mixture from jet pump communicates with inner space of tubes higher than jet pump. Through channel is made for overlapping through channel for lowering housing with jet pump into well and lifting it out. Hole made in lower part of jet pump housing is provided with thread for connecting self-contained measuring equipment. Sealing rings and fixing mechanism are installed on jet pump housing. Outer and inner ring grooves are made opposite to each other on support from outer and inner sides. Bypass ports are made in support wall between ring grooves in form of perforated partitions, summary area of holes of each perforated partition being not less than area of cross section of active medium supply channel at jet pump nozzle inlet, and area of cross section of any hole of perforated partition is not greater than of jet pump nozzle outlet section.
EFFECT: improved reliability of unit owing to prevention of failures caused by closing (clogging) of jet pump active nozzle by foreign objects.
1 dwg
