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Technical Specifications

 

19 19/64 G30

 Diameter: 490.0mm (19 19/64")  
IADC Code: 535X  
Design number: UT485  
State standard designation: МСЗ-ЦГВУ  
 

Specification
Gradient angle of axle journal 33°
Axle journal offset relative to drill bit axis 7.00 mm
Bearing type Roller bearing
Sealing Elastomer
Total number of inserts (inner/heel row) 209 (145/64)
Total number of insert rows (inner/heel row) 14 (11/3)
Number of changeable nozzles 4
Connecting thread З-177 (7 5/8 REG)
Drill bit net weight, kg 290.00
Drill bit gross weight, kg 317.50
 

Recommended Drilling Conditions
Rotation speed 200-40 rpm
Thrust load 14.00-36.00 t (30800 - 79200 lbs)
The lower level of rotation speed value corresponds the upper level of thrust load value and vice versa.
 

Purpose
The drill bit is designed for drilling soft abrasive formations with medium hard streaks
 

Design Features
Combined circulation (central and side) for what the screw from the central unit must be unscrewed

The shirttail and leg entering edge are hardfaced with tungsten carbide

2 rows of tungsten carbide inserts on cone gage.
 

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