DEVICE FOR LIQUID INJECTION FROM UPPER WATER-BEARING WELL RESERVOIR INTO LOWER OIL-BERING RESERVOIR Russian patent published in 2008 - IPC E21B43/14 

FIELD: methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells, particularly technology and equipment for cyclic liquid injection from water-bearing reservoir into oil-bearing one during oil-bearing reservoir flooding.

SUBSTANCE: device comprises pipe string with packer installed between water-bearing and oil-bearing reservoirs. Pipe string has additional packer arranged over upper water-bearing reservoir. Pipe string also has air-tight partition installed between packer and additional packer. Submersed plunger pump is mounted over partition and is located in pipe string. Submersed plunger pump comprises piston with through longitudinal channels and valve. Piston is fixedly secured to pump stem. Pipe string interior section located between pump and partition is communicated with water-bearing reservoir through radial orifice made in self-sealing packer body and in pipe string. Pipe string interior over plunger pump is communicated with pipe string annulus by means of through orifices made in pipe string over submersed plunger pump. Pipe string annulus over additional packer is communicated with oil-bearing reservoir by means of annular channel created between pipe string and self-sealing packer and through radial orifice made in pipe string under partition and pipe string interior below partition and through orifices made in packer body. Packer and additional packer are formed as self-sealed sleeves blocking liquid flow towards water-bearing reservoir during device operation.

EFFECT: simplified device structure along with increased operational efficiency and decreased power inputs.

1 dwg