BOREHOLE CALIBRATOR Russian patent published in 2014 - IPC E21B17/10 E21B10/26 

FIELD: oil-and-gas industry.

SUBSTANCE: invention relates to support-centring devices used in configuration of well bottom at inclined drilling of oil and gas wells. Borehole calibrator comprises top and bottom connection threads, inner flushing fluid feed channel, blades with reinforced working surfaces separated by flushing grooves. Grooves inner channels have channels for additional injection of flushing fluid lifting from bottom at acute angle to axis by nozzle at channel end or without it. Said channels for additional injection can be arranged in two or more tiers, one above the other, in one or more flushing grooves. Additional one or more injection channels can extend from calibrator inner channel in annulus in direction of top edge in blade mirror plane at acute angle of 26-30 degrees towards calibrator cylindrical part generatrix.

EFFECT: decreased packing, higher flushing rate in annulus and mechanical drilling speed.

2 cl, 8 dwg