| 摘要 |
oil recovery from wells. SUBSTANCE: downhole jet plant has packer, pipe string with support in which bypass windows are made, jet pump installed in casing on said support. Casing accommodates channel for supply of active medium to jet pump nozzle, channel for supply of medium pumped out of well, and channel for withdrawal of media mixture from jet pump. Installed in casing above channel for supply of pumped out medium and connected with it is conveying channel with mounting place for installation of sealing unit. Sealing unit has axial channel for passage of cable through said channel and channel of supply of pumped-out medium. Cable is used for installation with its help of instruments and other equipment in well below jet pump for their motion along wellbore with operating or idling jet pump. Channel for supply of active medium to nozzle of jet pump is communicated with bypass windows and through them with space surrounding pipe string. Channel for withdrawal of media mixture from jet pump is communicated with interval cavity of pipes above jet pump. Conveying channel accommodates appliance for supply to well and withdrawal from it of casing with jet pump. Appliance shuts off the conveying channel. Lower part of jet pump casing has a hole with thread for connection with autonomous measuring instrument. Outer diameter D of jet pump casing is less than minimum inner diameter D1 of pipe string at least by 1.0 mm. Diameter D2 of axial channel of sealing unit is larger than cable diameter D3 at least by 0.01 mm. Diameter D4 of channel for supply of pumped out medium is larger than cable diameter D3 at least by 2 mm. Installed on jet pump casing are packing rings and fixing mechanism. EFFECT: higher reliability. 2 dwg
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