MULTI-SEAT PDC-DRILL BIT AND METHOD OF PDC-CUTTER ARRANGEMENT AT DRILL BIT BLADES

摘要

FIELD: process engineering.;SUBSTANCE: set of inventions relates to PDC-drill bits for well boring and to method of PDC-cutter arrangement at drill-bit blades. PDC-drill bit comprises several blades including primary blades and secondary blades. Primary blades are reinforced by PDC-cutters in compliance with single-seat method. Secondary blades are reinforced by PDC-cutters in compliance with multi-seat method so that every cutter at secondary blade sits in radial position identical to single-seat cutter located at primary blade, immediately ahead of said secondary blade. At least one said secondary blade is arranged immediately behind every primary blade to make a balanceable PDC-drill bit.;EFFECT: balanceable PDC-drill bit, higher boring rate, wear resistance and stability.;24 cl, 3 dwg