DOWNHOLE SPRAY UNIT КЭУ-12 FOR LOGGING AND DEVELOPMENT OF HORIZONTAL WELLS Russian patent published in 2010 - IPC F04F5/54 E21B47/00 

FIELD: engines and pumps.

SUBSTANCE: proposed unit comprises flexible smooth tube 1 whereon mounted are well-logging tool 2 sealing element 2 and jet pump 4. Housing 5 of pump 4 accommodates nozzle 6 and mixing chamber 7 with diffuser 8. Outlet of the latter communicates with pipe 1, while outlet of nozzle communicates with hole clearance of pipe 1. Check valves 10, 24 are arranged at inlets of pumped fluid feed channel 9, fluid being fed into nozzle 6. Pipe 1 can move in tubing string 11 furnished with packer 12. Diametre D₁ of flow channel of packer 12 is smaller, by at least 12 mm than ID of D₂ of pipes 12. Holes 14 are made in pipe 1 above aforesaid tool 2. Ball valve 33 to shut off pipe 1 is arranged between pump 4 and element 3. The latter represents cylindrical casing 15 filled with set of elastic shims 16 and thrust washers 17 arranged there between and thrust pressure element 18 arranged thereon. Bush 19 with flange 20 and movable ring 21 are secured at bottom of housing 15. Collar 22 is arranged between housing 15 and ring 21. Diametre of flange 20 is smaller than diametre D₁ of flow channel of packer 12. Ring 21 has diametre D₃ larger diametre D₁. Lower surface of ring 21 is coated with elastic material.

EFFECT: reliable operation.