DRILL STRING FILTER Russian patent published in 2018 - IPC E21B43/08 

FIELD: mining engineering.

SUBSTANCE: invention relates to filtering devices for cleaning drilling mud and protecting drilling equipment against the ingress of large mechanical particles. The filter includes a perforated tube installed in axial channel of a hollow body. An adapter provided with a gripping device for removing the filter is mounted on the upper end of the perforated tube. A swirler in the form of a spiral is installed in the axial channel of the adapter. A flow splitter is installed in the middle part of the perforated pipe, perpendicularly to its axis. The flow splitter is in the form of a rod, on which two bevel cuts are made with formation of a triangle in section which is turned with its vertex to the adapter. A bottom with perforation holes and one radial hole is installed on the lower end of the perforated tube for installation of a cable, which upper end is fixed in the hole a supporting ring body rigidly connected to the adapter.

EFFECT: improved reliability by preventing clogging of perforations with slurry, holding filter elements in case of their destruction, reduction of flow rate.

3 dwg