PUMPING ROD BOREHOLE PLANT WITH DOUBLE-ACTING PUMP Russian patent published in 2013 - IPC F04B47/00 E21B43/40 

FIELD: oil and gas industry.

SUBSTANCE: plant includes a casing string with two entered formations, a pump lowered on a pipe string located in the casing string so that an inter-tube space is formed between them, which is separated with a packer located between entered formations. A pump is equipped with a plunger, an injection valve and a piston, which have the possibility of back-and-forth movement, upper and lower inlet holes with suction valves located above the packer and above and below the packer respectively. The pump outlet is interconnected from above by means of a pipe string through an injection valve to the well head, and from below through the lower injection valve to the space under the packer. The piston is free and has the possibility of interaction from above with the plunger and restricted back-and-forth movement. The plunger is equipped from below with a stock inserted into the piston with possibility of restricted back-and-forth movement. In the casing string there additionally arranged is a tube with a check valve, which connects the pump cavity between the piston and the lower injection valve with a delivery line through a shutoff member and the wellhead measurement equipment.

EFFECT: improving the oil extraction efficiency from the flooded well owing to providing direct control of quality and quantity of water pumped by a pump to the bottom formation of the well.

2 dwg