SYSTEM TO PUMP WATER AND CLEAN BOTTOMHOLE FORMATION ZONE OF INJECTION WELL Russian patent published in 2012 - IPC E21B43/20 E21B37/00 

FIELD: oil and gas industry.

SUBSTANCE: system includes wellhead equipment communicated with a water conduit, which is connected to a pump, and a reservoir via appropriate stop valves. According to the invention, the pump is of a displacement type with a controlled drive and is arranged on the water conduit in a wellhead zone of a well. The pump inlet is communicated with the water conduit via an additional stop valve, and the outlet - with a reservoir via its stop valve and the wellhead equipment via its stop valve. Besides, the water conduit is equipped between the wellhead equipment and the additional stop valve with a bypass line that covers the pump and equipped with a stop and control valve. The reservoir stop valve and the stop and control valve are made as capable of opening during cleaning of the bottomhole formation zone by fluid drainage from the injection well and closing as water is injected along the water conduit with a pump via the wellhead equipment into the well. At the same time there is an opportunity to additionally reduce pressure at the injection wellhead due to a displacement pump and operation of additional stop valves and stop valves of the wellhead equipment oppositely to other stop valves.

EFFECT: increased efficiency of device operation due to more intense cleaning of the bottomhole formation zone - removal of dirt from this zone.

1 dwg