PLANT FOR FLUID INJECTION FROM WATER-BEARING WELL RESERVOIR IN OIL-BEARING RESERVOIR Russian patent published in 2007 - IPC E21B43/14 

FIELD: obtaining oil from a multiple-zone well, particularly equipment and technology for cyclic fluid injection in oil-bearing reservoir during reservoir flooding or reagent injection.

SUBSTANCE: plant comprises packer, pipe string with injection and suction valves arranged below and over packer correspondingly, as well as pump installed on day surface of the well. Injection well is arranged over suction valve and provided with annular channel located outside pipe string. The annular channel communicates injection valve with inner over-the-packer well zone. Pipe string section over injection valve has cylinder with piston urged upwards by means of spring and provided with rod. Rod is located over piston and projects from cylinder into pipe string in air-tight manner. Cylinder interior section located over piston is communicated with inner below-the-packer well zone. Piston is air-tightly installed inside cylinder. Pump arranged on day surface is made as hydraulic cylinder with driving piston inside it. Working liquid is oil, which fills pipe string over cylinder and pump hydraulic cylinder interior. Technological orifices for hydraulic well interior communication with interior over-the-piston cylinder section are made in upper cylinder end part.

EFFECT: simplified structure along with increased operational efficiency.

1 dwg