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Technical Specifications

 

12 1/4 RS35

 Diameter: 311.1mm (12 1/4")  
IADC Code: 545X  
Design number: UT87M  
State standard designation: СЗ-ЦГВУ  
 

Specification
Gradient angle of axle journal 36°
Axle journal offset relative to drill bit axis 5.00 mm
Bearing type Roller bearing
Sealing Elastomer
Total number of inserts (inner/heel row) 178 (126/52)
Total number of insert rows (inner/heel row) 14 (11/3)
Number of changeable nozzles 4
Connecting thread З-152 (6 5/8 REG)
Drill bit net weight, kg 94.00
Drill bit gross weight, kg 98.40
 

Recommended Drilling Conditions
Rotation speed 300-40 rpm
Thrust load 11.00-22.00 t (24200 - 48400 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 medium hard abrasive formations
 

Design Features








 

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