DEVICE FOR FLUID INJECTION FROM WATER-BEARING RESERVOIRS INTO OIL-BEARING ONES Russian patent published in 2007 - IPC E21B43/14 

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

SUBSTANCE: device includes pump, main well, main packer and main pipe string provided with injection and suction valves arranged downstream and upstream of packer correspondingly. Main pipe string section located over injection valve has main cylinder with piston spring-loaded upwards and having rod. Main rod is located over main piston and projects from main cylinder into main pipe string in air-tight manner. Main cylinder interior over main piston is communicated with main well interior. Device also has additional well, additional packer, additional pipe string provided with injection and suction valves, as well as with additional piston spring-loaded upwards and having rod. Additional piston and rod are interconnected in the same way as main ones. Pump is of piston-type. Pump interior is separated into two sections with driving piston so that the first pump interior section communicates with main pipe string and the second interior section thereof is connected with additional pipe string. The working fluid is oil or rock oil and fills main and additional pipe string over main and additional cylinders correspondingly and piston-type pump interior.

EFFECT: increased operational efficiency due to hermetical working fluid isolation from fluid to be injected from water-bearing reservoirs into oil-bearing ones, elimination the need of frequent working fluid change and decreased operational costs and power inputs.

1 dwg