ABOVE-BIT CALIBRATOR Russian patent published in 2020 - IPC E21B10/26 

FIELD: mining.

SUBSTANCE: invention relates to the field of well drilling, namely to calibrators used for calibration and reduction of well bore deviation, in particular when drilling horizontal and directional wells. Above-bit calibrator comprises hollow cylindrical body with central flushing channel and blades on outer surface reinforced with wear-resistant inserts, at that, on external surface of housing alternating through one long and short blades, wherein lower surfaces of all blades are installed at same level, and upper surfaces of long blades are located above upper surfaces of short blades, wherein in each shortened blade there are cylindrical inner channels, a horizontal inner channel extending from the central flushing channel along the radius and changing into an upwardly directed vertical inner passage extending on the upper surface of the shortened blade, wherein that ejection nozzle is arranged at outlet of vertical inner channel to make ejection chamber between walls of well, housing of above-bit calibrator and walls of two adjacent long blades.

EFFECT: technical result consists in improvement of efficiency of above-bit calibrator due to its equipping with ejection system of well cleaning.

1 cl, 5 dwg