The device comprises a body provided with bypass ports embodied therein and an insert with a jet pump and sealing elements. The insert comprises a pass channel, a channel for supplying an active medium to the pump nozzle, a channel which is used for supplying a pumped-out medium to the pump and which communicates with the pass channel and an output channel connected to an annular space. A mounting seat for a sealing unit is embodied in the pass channel above the channel for supplying the pumped-out medium. Said mounting seat is provided with an axial channel for passing a cable, which is used for moving instruments along the well bore, therethrough and through the pass channel. An axially movable spring-loaded steady bush provided with bypass holes in the wall thereof is arranged in the body. The insert provided with the pump is placed on the mounting seat embodied in the bush. An annular recess limiting the bush displacement is embodied in the body. The output channel is connected to a body surrounding space when the bush is in the lower position thereof and the bypass ports are closed by the steady bush wall when the bush is in the top position. Said invention makes it possible to reduce a time for a well examination and development.