DRILL STRING FILTER Russian patent published in 2017 - IPC E21B43/08 

FIELD: mining engineering.

SUBSTANCE: filter includes a perforated pipe with an adapter, a grip and a supporting ring installed at the tapering in the axial channel of a hollow body. The body of the upper adapter has bypass openings hydraulically connecting the axial channel of the drill string with the inner cavity of the perforated pipe. The grip is provided with a flow turbulizer located in the axial channel of the perforated pipe and made in the form of a rod, in the middle part of which there is a row of transverse cuts arranged in staggered order in height. A helical spiral cut is made at the lower end of the rod. The perforated pipe is made in the form of truncated cone and provided with a bottom with a row of drain holes and central hole in the form of a conoid nozzle.

EFFECT: improved efficiency and reliability of filtration.

1 dwg