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Technical Specifications

 

9 7/8 M70

Diameter: 250.8mm (9 7/8")  
IADC Code: 722Y  
Design number: T402  
State standard designation: К-ПГВ  
 

Specification

Gradient angle of axle journal 36°
Axle journal offset relative to drill bit axis 0.50 mm
Bearing type Roller bearing
Sealing None
Total number of inserts (inner/heel row) 174 (121/53)
Total number of insert rows (inner/heel row) 11 (8/3)
Number of changeable nozzles 3
Connecting thread З-121 ук. (-)
Drill bit net weight, kg 50.00
Drill bit gross weight, kg 51.50
 

Recommended Drilling Conditions

Rotation speed 115-60 rpm
Thrust load 11.00-23.00 t (24200 - 50600 lbs)
The lower level of rotation speed value corresponds the upper level of thrust load value and vice versa.
 

Purpose

 

Design Features









 

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