DEVICE FOR EXTRACTION OF WELL PRODUCT AND WATER PUMPING TO FORMATION Russian patent published in 2012 - IPC E21B43/40 

FIELD: oil and gas industry.

SUBSTANCE: device for extraction of well product and water pumping to formation includes perforated casing string in the interval of upper productive and lower receiving formations, tubing string, upper bottom-hole pump arranged in tubing string under dynamic level of accumulated oil and lower pump for water pumping to lower receiving formation. Also, device includes separating chamber, shank, non-return valve and packer installed in the well above the roof of receiving formation, accumulation chamber made in the form of separators-sediment traps. Additional packer is installed at the boundary of oil-water contact (OWC). Plunger of upper bottom-hole pump is rigidly connected to piston of lower pump having the possibility of restricted axial movement through the length of upper pump plunger stroke. Tubing string above the packer is equipped with radial holes for connection of water-bearing zone of productive formation to under-piston space of lower pump. Separating chamber is made in the form of the casing arranged concentrically outside tubing string from OWC level to upper pump inlet. At that, separators-sediment traps are provided on outer surface of the casing.

EFFECT: improving the separation quality of phases into oil and water and reducing electric power consumption.

1 dwg