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Technical Specifications

 

8 3/4 RS20

 Diameter: 222.3mm (8 3/4")  
IADC Code: 515X  
Design number: UT483  
State standard designation: МЗ-ЦГНУ  
 

Specification
Gradient angle of axle journal 33°
Axle journal offset relative to drill bit axis 7.20 mm
Bearing type Roller bearing
Sealing Elastomer
Total number of inserts (inner/heel row) 100 (56/44)
Total number of insert rows (inner/heel row) 10 (7/3)
Number of changeable nozzles 4
Connecting thread З-117 (4 1/2 REG)
Drill bit net weight, kg 40.00
Drill bit gross weight, kg 41.50
 

Recommended Drilling Conditions
Rotation speed 200-40 rpm
Thrust load 4.50-12.50 t (9900 - 27500 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
 

Design Features








 

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