FIELD: pumps.
SUBSTANCE: invention relates to the field of pump engineering, namely to well jet pumping units for the development of side trunks of oil and gas wells. Installation consists of cylindrical body 1 with through hole 2, in which sleeve 3 is installed with axial displacement, having outer groove 4 of smaller diameter in middle part thereof. One side hole 5 is made in the groove, connecting the groove with inner hole 6 of sleeve 3. In the upper part of sleeve 3 seat 7 is made for outer element 8, made in the form of a ball. Sleeve 3 is fixed in housing 1 with collapsing mount 9. Seals 10 are installed between the contacting surfaces of the sleeve and the housing. In the lower part of through hole 2 of housing 1 there is protrusion 11 for supporting sleeve 3 thereon. In housing 1 nozzle 15 and the diffuser 16 are installed with the formation of mixing chamber 12, discharge cavity 13 and output cavity 14. Discharge cavity 13 is connected to the upper part of through hole 2 with bypass channel 17. Output cavity 14 is communicated with the annular space. Cavity 20 above the saddle is connected to mixing chamber 12 by channel 21. Cavity 22 under the saddle is connected with the middle part of through hole 2 with additional channel 23.
EFFECT: efficient work of downhole jet machines in shanks of small diameter is ensured.
3 cl, 2 dwg
