FIELD: engines and pumps.
SUBSTANCE: invention relates to rock PDC-cutters, particularly, to drill heads, reamers, stabilisers and bits. Proposed tool comprises body with blades furnished with PDC-cutting tools. To up the efficiency of rock cutting by formation of open stepped surface completely destructed at minimum power consumption, working elements are arranged on blades so that at tool operation on well face a stepped surface is formed starting from tool axis to periphery at steps in width a=(0.2÷0.4)D+0.5d and height b=(0.4÷0.6)D, where D is bit diameter and d is diameter of PDC-cutter.
EFFECT: higher tool efficiency.
3 cl, 6 dwg
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