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Technical Specifications

 

8 1/2 FM45

Diameter: 215.9mm (8 1/2")  
IADC Code: 627Y  
Design number: UT279  
State standard designation: ТЗ-ГАУ  
 

Specification

Gradient angle of axle journal 36°
Axle journal offset relative to drill bit axis 1.60 mm
Bearing type Journal bearing
Sealing Elastomer
Total number of inserts (inner/heel row) 154 (103/51)
Total number of insert rows (inner/heel row) 14 (11/3)
Number of changeable nozzles 3
Connecting thread З-117 (4 1/2 REG)
Drill bit net weight, kg 41.00
Drill bit gross weight, kg 42.50
 

Recommended Drilling Conditions

Rotation speed 180-40 rpm
Thrust load 10.00-21.00 t (22000 - 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 hard abrasive formations
 

Design Features

Lateral flushing. through hydromonitor nozzles

The shirttail and leg entering edge are hardfaced with tungsten carbide

The leg is protected with tungsten carbide inserts

2 rows of carbide inserts on the reverse cone of the cones

 

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