| 摘要 |
The invention relates to the petroleum industry and can be used for extracting oil in the presence of high sand content in the formation fluid and large well curvature. The downhole pump assembly comprises a pump, installed in a pipe string, with a movable working body, and an inlet/outlet valve connected to a wellhead drive by means of a bypass channel for supplying a drive medium. According to the invention, the movable working body is in the form of a buffer fluid located in the bottom part of the pump chamber of the pump housing below an inlet valve, forming a hydro-seal and being able to interact with the pumped fluid which enters the pump chamber through a lateral aperture in the pump housing and through the inlet valve. The bypass channel is in the form of a flexible pipe located externally or internally. |
