IMMERSED PUMP WITH CLEANED IN WELL FILTER Russian patent published in 2011 - IPC E21B43/00 E21B37/08 E21B34/06 

FIELD: gas-and-oil producing industry.

SUBSTANCE: device is equipped with immersed well pump lowered on flow string and installed in hollow cylinder case. The case is pressure tight and is rigidly fixed from top facilitating flow of pumped fluid via a gap between the case and the pump. The device is furnished with a hollow cylinder shank end and back valve positioned behind the pump downstream pumped fluid. The shank end is secured on the side of a lower open end of the case and is equipped with a filter in its lower part. The case is communicated with internal space of the flow string above the back valve letting fluid from beneath upward. The case is equipped with a spring loaded controlled valve shutting overflow of fluid in the case between a receiving orifice of the pump and connection with internal surface of the pipe. Also, the spring loaded controlled valve maintains pressure in the flow string during operation of the pump.

EFFECT: raised efficiency of device, efficiency of filter cleaning regardless of depth of installation in well.

2 dwg