Patent ID: 7686078

Claim:
A well jet device, comprising, arranged on a pipe string from bottom to top, a packer with a central channel defined therein and a jet pump, said jet pump having a body comprising a nozzle and a mixing chamber with a diffuser and a channel for supplying a working medium to the nozzle and a channel for supplying a medium pumped out of a well, the diffuser output being connected to an annular space surrounding the pipe string, and the jet pump nozzle, through the channel for supplying a working medium, and the input of the channel being connected to the inner cavity of the pipe string, a working medium flow switch being installed in the jet pump body coaxially with the pipe string, the switch being made as a supporting sleeve axially movable and spring-loaded against the body, the sleeve having bypass openings 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 therethrough a logging cable or a logging instruments wire used for measuring physical parameters of a well and a medium pumped out, and for determining its production rate, or for installing onto the mounting seat a depression insert with a check valve and self-contained instruments hung therebelow and used for measuring physical parameters of a medium pumped out of a well and capable of recording formation pressure recovery curves for the under-packer space, wherein, when the supporting sleeve is in its initial upper position, the channel for supplying a working medium 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 input of the channel for supplying a working medium, said bypass openings of the supporting sleeve being in communication with the input of the channel for supplying a medium pumped out of a well.