Patent ID: 7549478

Claim:
A well jet device, comprising, arranged on a pipe string from bottom to top, a packer with a central channel made therein and a jet pump, which body comprises a nozzle and a mixing chamber with a diffuser as well as a channel for supplying a working medium to the nozzle, a channel for withdrawing a medium mixture and a channel for supplying a medium pumped out of a well, wherein the jet pump nozzle is connected via the channel for supplying a working medium to the annular space surrounding the pipe string, and the input of the channel for supplying a medium pumped out of a well and the diffuser output via the channel for withdrawing a medium mixture are connected to the inner cavity of the pipe string, a working medium flow switch is installed in the jet pump body, coaxially with the pipe string, the switch being made as a supporting sleeve spring-loaded against the body and movable along the axial direction, the sleeve having a thrust flange arranged in a bore made in the body, and, above the supporting sleeve thrust flange, an annular channel being made in the pump body, which is connected to the channel for supplying a working medium through the channel for supplying a pumped-out medium and the nozzle, and bypass openings are made in the supporting sleeve as well as a mounting seat for the purpose of installing onto it a sealing unit lowered through the pipe string, said sealing unit having an axial opening for passing through it a logging cable or a wire with logging instruments hanged thereon and used for measuring physical parameters of a well and a medium pumped out of it, and for determining its production rate, or for installing onto the mounting seat a depression insert with a check valve and self-contained instruments hanged below it and used for measuring physical parameters of a medium pumped out of a well and capable of recording formation pressure recovery curves in the under-packer area, wherein, when the supporting sleeve is in its initial upper position, the output of the channel for withdrawing a medium mixture and the channel for supplying a pumped-out medium are closed by the sleeve, and when the supporting sleeve is in its lower position its upper end is located below the output of the channel for withdrawing a medium mixture and the bypass openings of the supporting sleeve being in communication with the input of the channel for supplying a medium pumped out of a well.