Patent ID: 7806174

Claim:
A well jet device comprising: a packer, a pipe string with a support in which overflow windows and a seat for mounting a jet pump are made; said jet pump has a body provided with an annular shoulder, said shoulder being intended for installing onto the seat in the pipe string support, and said body being provided with a channel for delivering an active fluid into the jet pump nozzle, a channel for delivering a pumped out fluid into the jet pump, a channel for removing a fluid mixture from the jet pump and a through channel having a sealing unit installed in its upper part, said through channel going in parallel to the channel for delivering a pumped out fluid, and an axial channel being made in the sealing unit, said axial channel being used for passing a logging cable intended for connecting a downhole instrument, below the jet pump, which may be moved along the borehole when the jet pump is or is not operated; the channel for delivering an active fluid into the jet pump nozzle is connected to the overflow windows and, through the latter, to annular space surrounding the pipe string; a mixing chamber with a diffuser is arranged in line with the nozzle, and the diffuser is connected to the piping inner cavity above the jet pump on its side where a fluid mixture exits through the channel for removing a fluid mixture; a check valve is installed in the channel for delivering a pumped out fluid on its input side on the lower part of the jet pump body, and a guiding bush with an axially movable rod which is arranged therein in parallel to the logging cable is installed below the check valve, the upper end of the rod being positioned under the closing element of the check valve, and a fork, over which the logging cable is passed, being attached to the lower end of the rod; the rod is installed so that it may act on the closing element of the check valve and push the closing element off the seat when the downhole instrument is lifted up and contacts the rod fork.