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Technical Specifications
7 1/2 RS05
Diameter:
190.5mm (7 1/2")
IADC Code:
425X
Design number:
UT457
State standard designation:
МЗ-ГНУ
Specification
Gradient angle of axle journal
33°
Number of blades
0
Axle journal offset relative to drill bit axis
6.40 mm
Type of diamond inserts
Bearing type
Roller bearing
Total number of PDC inserts (cutting/gauge)
0 (0/0)
Sealing
Elastomer
Total number of PDC inserts for back reaming
0
Total number of inserts (inner/heel row)
0 (0/0)
Total number of inserts (inner/heel row)
81 (42/39)
Total number of antivibration inserts
0
Total number of insert rows (inner/heel row)
0 (0/0)
Total number of insert rows (inner/heel row)
9 (6/3)
Number of changeable nozzles
3
Number of changeable nozzles
3
Connecting thread
З-117 (4 1/2 REG)
Connecting thread
З-117 (4 1/2 REG)
Drill bit height, mm
0.0
Drill bit net weight, kg
30.00
Drill bit gross weight, kg
31.50
Recommended Drilling Conditions
Rotation speed
200-40 rpm
Thrust load
3.00-10.00 t (6600 - 22000 lbs)
Drilling fluid consumption
0.00-0.00 l/s
Recommended make-up torque
0.00-0.00 kNm
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
Side circulation. Side jetting nozzles
The leg shirtttail and the entering edge are hardfaced with tungsten carbide
The leg shirttails are protected with tungsten carbide inserts
Tungsten carbide inserts on cone gage
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