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Technical Specifications

 

6 3/4 M70

Diameter: 171.4mm (6 3/4")  
IADC Code: 722Y  
Design number: T211  
State standard designation: К-ПГВ  
 

Specification

Gradient angle of axle journal 36°
Axle journal offset relative to drill bit axis 0.00 mm
Bearing type Roller bearing
Sealing None
Total number of inserts (inner/heel row) 120 (76/44)
Total number of insert rows (inner/heel row) 11 (8/3)
Number of changeable nozzles 3
Connecting thread З-88 (3 1/2 REG)
Drill bit net weight, kg 19.00
Drill bit gross weight, kg 20.00
 

Recommended Drilling Conditions

Rotation speed 115-60 rpm
Thrust load 8.00-15.00 t (17600 - 33000 lbs)
The lower level of rotation speed value corresponds the upper level of thrust load value and vice versa.
 

Purpose

The bit is designed for drilling in hard rocks
 

Design Features

Side and bearing borehole bottom circulation with air and water mixture

The shirttail, leg and leg entering edge are hard-faced with tungsten carbide

The leg is protected with tungsten carbide inserts

Tungsten carbide inserts on cone gage

 

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