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Technical Specifications

 

12 1/4 RS1

 Diameter: 311.1mm (12 1/4")  
IADC Code: 115  
Design number: UT105M1  
State standard designation: М-ГВУ  
 

Specification
Gradient angle of axle journal 33°
Axle journal offset relative to drill bit axis 10.00 mm
Bearing type Roller bearing
Sealing Elastomer
Total number of inserts (inner/heel row) 80 (36/44)
Total number of insert rows (inner/heel row) 7 (4/3)
Number of changeable nozzles 4
Connecting thread З-152 (6 5/8 REG)
Drill bit net weight, kg 80.00
Drill bit gross weight, kg 82.80
 

Recommended Drilling Conditions
Rotation speed 300-40 rpm
Thrust load 8.00-21.00 t (17600 - 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 formations
 

Design Features
Lateral flushing through hydromonitor nozzles

The shirttail and leg entering edge are hardfaced with tungsten carbide

Complete coverage of all cone teeth with a hard alloy.

Tungsten carbide inserts on cone gages
 

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