FIELD: engines and pumps.
SUBSTANCE: well jet unit allows creating a number of various preset pressure difference depressions using a jet pump in the well subpacker zone. Using a logging device allows recording the well physical parameters and those of the medium pumped out from the well. Making the stepped flow-through channel diameter, just below the unit mounting seat, not less than that of the parker axial flow-through hole allows feeding chemical reagents or fracturing liquid into the pay-out bed via the casing. Check valves arranged in the feed channels prevent, during pumping in, an ingress of media pumped in the payout bed into the well behind-the-string subparker space.
EFFECT: optimising well testing procedure, higher reliability and efficiency of well jet unit.
2 cl, 3 dwg
