Blade drilling bits for drilling with washing d = 112 - 295.3 mm

Blade drilling bits for drilling with washing d = 112 - 295.3 mm

Blade drilling bits for noncore well drilling with washing in grounds of the I-V categories on drilling capacity with inclusions of detrital material of stronger rocks. Bits are equipped with cutters, reinforced by hard-alloy inserts for drilling in grounds of various categories:

• cutters of "M" type - for grounds of the I-III categories on drilling capacity;
• cutters of "MС" type - for grounds of the II-IV categories on drilling capacity;
• cutters of "С" type - for grounds of the III-V categories on drilling capacity.

Bits are equipped with calibrating tools in the form of hard-alloy inserts for prevention of wellbore narrowing.
Working surfaces of blades are protected from abrasive wear by building up of a hard alloy.
Blade bits provide mechanical drilling speeds exceeding by 2.5 times of drilling speeds with rolling drilling bits at more than 10 times decrease of necessary axial stress on the rock cutting tool; have the increased wear resistance thanks to strengthening by hard-alloy inserts and building up; have the increased maintainability thanks to possibility of replacement of cutters directly in field conditions.