Patent ID: 7926563

Claim:
A well jet device for well-logging operations, comprising a jet pump, which is installed on a pipe string, and a packer, an active nozzle and a mixing chamber with a diffuser being arranged in alignment in the jet pump body as well as a stepped pass-through channel with a mounting seat between steps, a channel for supplying a pumped-out medium communicating below said mounting seat with said stepped pass-through channel via lateral openings made in the jet pump body, and a channel for supplying an active working medium communicating on the channel's output side with the active nozzle and on the channel's input side with a pipe string annular space being made in the jet pump body, and the channel for supplying a pumped-out medium being connected to the pipe string below the stepped pass-through channel via a return valve, said stepped pass-through channel provides for installation of a sealing unit therein which is made as a hollow stepped cylindrical body with a sealing element in the body's upper part and a stepped piston arranged lower, which is spring-loaded against the sealing element and rests on an annular shoulder made in a sealing unit body cavity; openings are in the sealing unit body wall opposite to said lateral openings in the jet pump body; and the stepped piston in the piston's lower position closes the openings in the sealing unit body wall, and when the stepped piston is in the piston's upper position the channel for supplying the pumped-out medium is connected to the pipe string below the jet pump body via the lateral openings in the jet pump body and the openings in the sealing unit body wall, axial channels being made in alignment in the stepped piston and in the sealing element for the purpose of passing a logging cable on which a logging instrument is suspended via a cable head below the jet pump body.