OIL-WELL PUMPING UNIT Russian patent published in 2001 - IPC

FIELD: fluidics. SUBSTANCE: oil-well pumping unit includes tubing string, packer and running-in jet apparatus with active nozzle, mixing chamber, diffuser and housing. Tubing string is provided with casing with coaxial inner stepped locating bores and seat. Radial holes for delivery of active medium are made between upper bore and seat. Housing of jet apparatus is made in form of stepped bush with external circular projections; bores of this bush are used for receiving main nozzle with passive medium supply passages, mixing chamber with additional nozzle - circular clearance for delivery of active medium for additional nozzle and diffuser. Circular clearances of main and additional nozzles are brought into communication with common active medium supply chamber which is communicated with delivery of active medium through radial holes. Jet apparatus is provided with joint is mounted in casing of string for withdrawal by means of cable. It rests by at least one external circular projection of jet apparatus casing against bearing seat of string casing. EFFECT: simplified construction. 1 dwg