WELL JET DEVICE FOR WELL-LOGGING OPERATIONS AND THE OPERATING METHOD THEREOF

摘要

The device comprises a jet pump mounted on a pipe string and a packer. The pump body is provided with a steplike pass channel which is embodied therein and communicates with a pumped-out medium supplying channel and an active medium supplying channel which is connected to an active nozzle at the output thereof and to an annular space. The pumped-out medium-supplying channel is connected to the pipe string downstream of the steplike channel via a return valve. A sealing unit in the form of a hollow steplike cylindrical body provided with a sealing element in the top part thereof is arranged in said steplike channel. A spring-loaded steplike piston supported by an annular projection is located downstream. Holes are embodied in the unit body in front of the holes on the pump body. The piston, in the lower position thereof, closes the unit body holes. When the piston is in the top position, the channel for supplying a medium pumped-out from the well through the holes of the unit and pump bodies is connected to the pipe string downstream of the pump body. The piston and sealing element are provided with coaxial channels which are embodied therein and used for passing a cable with a logging instrument suspended below the pump body.