FIELD: mining engineering.
SUBSTANCE: device contains a tubing string fixed in the casing string by wellhead fittings and a supporting packer. This string forms an annular coaxial flow channel with the casing string of the well. There is a jet pump. This pump, depending on the embodiment of the device, provides a direct or reverse circulation pattern. The options of intertubular coaxial flow channel and a jet pump with a branch pipe for taking the formation product are considered. The jet pump in its general form contains a cross-flow coupling with interconnected axial and peripheral longitudinal flow channels. In the axial channel of the coupling there is a nozzle or diffuser, coupled with their mating diffuser or nozzle, forming a formation product supply chamber, connected with the peripheral longitudinal flow channels of the coupling on one side, and with an inlet manifold provided with a check valve on the other side. This valve provides the communication with the producing formation of the well through the channel of the supporting packer, adjacent to the manifold, or the branch pipe of the formation product take, depending on the option of the device. The radial channels of the coupling in one or another location of the jet pump in the well are communicated with the annular or tubular spaces through coaxial flow channels. The axial channel of the coupling on the side opposite to the nozzle or diffusor is blocked by a plug below the level of the radial channels. In the upper part of the jet pump, a locking device is provided for attaching and retrieving it from the well using a catcher.
EFFECT: increased level of maintainability of the device and higher reliability of development well operation.
4 cl, 6 dwg
