METHOD AND DEVICE FOR CLEANING WELL FILTERS Russian patent published in 2018 - IPC E21B37/08 

FIELD: oil and gas industry.

SUBSTANCE: group of inventions relates to oil and gas industry and can be used to clean the horizontal part of a wellbore and filter element meshes. Method includes lowering on the tubing a device for cleaning downhole filters, pumping a washing liquid through the tubing. Device is equipped with a check valve that passes the liquid from the bottom to the top, the device is lowered onto the tubing in the first interval of the filter and direct washing is started by pumping the washing liquid through the tubing through nozzles installed in the radial channels of the device body. Device is then moved to the next filter interval, continuing pumping of the washing liquid through the tubing. After reaching the face, backwashing is performed by feeding the washing liquid into the annular space between the tubing and the casing and lifting it together with mechanical impurities and sediment particles washed from the walls of the casing and the filter through the open check valve through the passageway of the device and the tubing to the surface. At the end of the work, the device is removed from the well. Central radial channels of the body of the device are perpendicular to the axis of the body, the uppermost ones are inclined towards the axis of the body towards the upper part of the body, and the extreme lower ones are inclined towards the axis of the body towards the lower part of the body.

EFFECT: enabling cleaning in a single lowering-raising operation, high efficiency and reliability of cleaning.

3 cl, 1 dwg