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Technical Specifications

 

8 1/2 FS30

Diameter: 215.9mm (8 1/2")  
IADC Code: 537X  
Design number: UT291  
State standard designation: МСЗ-ЦГАУ  
 

Specification

Gradient angle of axle journal 33°
Axle journal offset relative to drill bit axis 4.80 mm
Bearing type Journal bearing
Sealing Elastomer
Total number of inserts (inner/heel row) 125 (102/23)
Total number of insert rows (inner/heel row) 13 (10/3)
Number of changeable nozzles 4
Connecting thread З-117 (4 1/2 REG)
Drill bit net weight, kg 38.40
Drill bit gross weight, kg 39.90
 

Recommended Drilling Conditions

Rotation speed 180-40 rpm
Thrust load 10.00-21.00 t (22000 - 46200 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









 

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