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 self-sealing packer arranged over pipes of upper water-bearing reservoir. The self-sealing packer blocks liquid (reservoir water) flow in top-down direction. Pipe string also has air-tight partition installed between packer and self-sealing packer. Plunger pump is mounted over partition and is included in pipe string. 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 plunger pump. Pipe string annulus over self-sealing packer is communicated with oil-bearing reservoir by means of annular channel created between pipe string and self-sealing packer. Packer is made as elastic sleeve pressed with perforated liner from below as packer rests upon well bottom. Perforated liner is telescopically put on pipe string and may perform limited upward movement.

EFFECT: increased operational efficiency along with decreased power inputs.

1 dwg