Download PDF

Technical Specifications


15 1/2 R1

Diameter: 393.7mm (15 1/2")  
IADC Code: 111  
Design number: UT31  
State standard designation: М-ЦГВ  


Gradient angle of axle journal 33°
Axle journal offset relative to drill bit axis 10.00 mm
Bearing type Roller bearing
Sealing None
Total number of inserts (inner/heel row) 175 (77/98)
Total number of insert rows (inner/heel row) 9 (6/3)
Number of changeable nozzles 3
Connecting thread З-171 (6 5/8 FH)
Drill bit net weight, kg 161.00
Drill bit gross weight, kg 165.40

Recommended Drilling Conditions

Rotation speed 240-80 rpm
Thrust load 7.00-24.00 t (15400 - 52800 lbs)
The lower level of rotation speed value corresponds the upper level of thrust load value and vice versa.


The drill bit is designed for drilling soft formations

Design Features


Views: 1019