BOREHOLE CALIBRATOR Russian patent published in 2019 - IPC E21B17/10 E21B19/24 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil and gas industry, namely, to support-aligning devices used in assembly of drill string bottom at inclined directed and / or horizontal drilling of oil and gas wells. Well borehole calibrator includes housing with upper and lower connecting threads and central channel for supply of flushing liquid to the working face, blades with reinforced working surfaces, separated by flushing slots, jet channels with nozzle-nozzle at the end or without it, interconnected with central channel for bottom-up injection to flush fluid walls at acute angle to axis. Central channel from above has cylindrical expansion with transition end face from below. Jet channels are arranged in one row evenly along perimeter below blades and tightly closed in transport position from inside by hollow bushing located inside cylindrical expansion and fixed in transport position by shear elements. Hollow bushing is equipped from above with a saddle for a throwback ball and is made with possibility after interaction of a seat with a ball of destruction of shear elements and movement downwards to a transition end with opening of jet channels in working position.

EFFECT: high-quality cleaning of the well wall from the slurry by directing the entire liquid flow after drilling through the jet channels.

1 cl, 3 dwg