WELL PUMPING PLANT FOR INJECTION OF FORMATION WATER INTO OIL-BEARING FORMATION Russian patent published in 2001 - IPC

FIELD: oil producing industry; applicable in injection of water from underlying water-bearing horizons to overlaying oil-bearing object with low-permeable reservoirs to maintain and raise formation pressure in it. SUBSTANCE: well pumping plant has a pump pipe string with check valve in its lower part and connected with insert pump and lowered into flow string with perforated sections against oil-bearing and water-bearing formations. Two packers are installed in annular space above and below oil-bearing formation. Installed above pump cylinder on pump pipe string is branch pipe with packing rings on internal surface and radial channels hydraulically communicating the internal space of branch pipe with interpacker zone of well annular space. Concentrically located in branch pipe is step sleeve for axial motion with passing holes and toothed end connected with pump cylinder adapter with the help of tongs. Plunger rod passing through sleeve central hole has upper and lower pushers for moving the plunger in branch pipe. Engagement of pushers with sleeve is accomplished from wellhead through rod suspension. Upper packer shutting off the annular space above oil-bearing formation is self-sealing and installed above radial holes on branch pipe. Packer self-sealing collar is located in protective case whose internal space is hydraulically communicated through radial holes with branch pipe. EFFECT: higher efficiency of intrawell water transfer from underlying water-bearing to overlaying oil-bearing formations by rod pump plant due to simplification of its design and provision of investigation of operation of sucker-rod pumps and formations. 2 dwg