SYSTEM FOR WATER INJECTION IN INJECTION WELL FOR FORMATION PRESSURE MAINTENANCE Russian patent published in 2006 - IPC E21B43/20 

FIELD: oil production industry, particularly to maintain formation pressure.

SUBSTANCE: system comprises injection well, drive and pump. Drive and pump are arranged out of the well and may cooperate with each other. Inlet pump part is connected with low pressure pipeline. Pump outlet is connected with injection well by high pressure pipeline. The drive is pumping unit with suspension bracket installed on frame. The pump is of piston type fixedly connected with pumping unit frame and arranged in horizontal or inclined plane. The pump has piston with polished rod. The system additionally has guiding unit with flexible ties provided with at least two grooves. One groove is adapted for one flexible tie winding/unwinding, another one is used for another flexible tie winding/unwinding. The flexible ties are separated and extend at an angle one to another. The first end of each flexible tie is fixed in guiding block, the second one is secured to suspension bracket of pumping unit and to polished rod.

EFFECT: increased operational efficiency of injection wells in the case of poorly-permeable reservoirs, low injection volumes due to provision of injection regime regulation without pumping equipment replacement, reduced pumping equipment wear and increased operational reliability.

21 cl, 4 dwg