WELL FILTER (VERSIONS) Russian patent published in 2017 - IPC E21B43/08 

FIELD: oil and gas industry.

SUBSTANCE: according to the first version, the device comprises a slot filter element mounted on a perforated pipe, an impeller connected to a shaft reinforced in bearing supports mounted in the pipe and made rotatable. The perforated pipe is made with a solid upper part, within which the impeller bearing supports are located. The impeller blades are made with mass imbalance of not less than 20 g⋅mm. According to the second version, the filter is provided with additional mass movably attached to radially-mounted axle connected to the impeller and provided with thrusts on both sides relative to additional mass. An elastic element is installed between the mass and long-distance thrust relative to the shaft.

EFFECT: simplified manufacturing, improved self-cleaning ability, improved service life of submersible pumping unit.

2 cl, 2 dwg