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Technical Specifications

 

15 RS4

Diameter: 381.0mm (15")  
IADC Code: 215  
Design number: UT171  
State standard designation: С-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) 186 (122/64)
Total number of insert rows (inner/heel row) 11 (8/3)
Number of changeable nozzles 4
Connecting thread З-177 (7 5/8 REG)
Drill bit net weight, kg 138.50
Drill bit gross weight, kg 142.90
 

Recommended Drilling Conditions

Rotation speed 300-40 rpm
Thrust load 12.00-30.00 t (26400 - 66000 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 formations
 

Design Features

Combined circulation (central and side) for what the screw from the central unit must be unscrewed

The shirttail and leg entering edge are hardfaced with tungsten carbide

The leg is protected with tungsten carbide inserts

Complete surfacing of cone teeth with a hard alloy

Tungsten carbide inserts on cone gages
 

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