FIELD: engines and pumps.
SUBSTANCE: unit incorporates a string with an axial through hole parker arranged upward and a bearing furnished with an axial channel provided with a jet pump (JP) seat. The bearing wall has a bypass channel with a check valve. The jet pump comprises a cylindrical casing with an annular ledge on its outer surface for the jet pump to be mounted in the bearing seat. The casing has the channels to feed active medium into the jet pump nozzle and to discharge the pumped out medium therefrom, and a flow-through channel with a sealing unit arranged in its top part. The flow-through channel is connected to the pumped-out medium feed channel below the sealing unit. The aforesaid unit is furnished with an axial channel to house the logging cable with logging instrument allowing it to move along the well hole. The active medium feed channel communicates with the bearing flow-through channel and, via the latter, with around-the-string space. A mixing chamber with a diffuser is arranged aligned with the nozzle. The diffuser, on the outlet side, communicates, via the medium mix discharge channel, with the string inner space above the jet pump. The bearing axial channel diameter, below the aforesaid seat, is not smaller than the parker axial flow-through hole diameter.
EFFECT: expanded performances resulted from separation of in- and behind-string spaces with inoperative jet pump.
2 dwg
