WELL PUMPING SYSTEM FOR LIQUID PUMPING Russian patent published in 2020 - IPC E21B43/12 F04B47/00 

FIELD: drilling of wells.

SUBSTANCE: group of inventions relates to well system for pumping well fluid from annular space between intermediate and production tubing string. Well system comprises an intermediate casing string and a pump. Pump is arranged at the wellhead and is configured to increase pressure in annular space to displace fluid located in annular space. There is operational tubular metal structure. It has the first internal diameter and is located in intermediate casing string with formation of annular space. There is an operational packer. It is located between intermediate casing string and production tubular metal structure. There are the first fluid pumping unit and the second liquid pumping unit. Each of these units comprises a tubular part containing a wall having a second inner diameter, an outer surface and a passage. Said tubular part can be installed as part of tubular metal structure. There is check valve. It is connected to external surface and has inlet hole for connection with annular space and outlet hole. In addition, the device comprises a sliding coupling for each of the first and second liquid pumping units. Sliding coupling is located opposite each of the first and second liquid pumping units. It is made with possibility of sliding along inner surface of tubular part between open position and closed position to open or close said passage to create or terminate communication with possibility of transferring fluid medium with first and second liquid pumping units.

EFFECT: technical result is higher efficiency of well fluid pumping-out.

16 cl, 8 dwg