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Technical Specifications
4 1/8 T4
Diameter:
104.8mm (4 1/8")
IADC Code:
211C
Design number:
UT71
State standard designation:
С-ЦА
Specification
Gradient angle of axle journal
33°
Number of blades
0
Axle journal offset relative to drill bit axis
3.00 mm
Type of diamond inserts
Bearing type
Journal bearing
Total number of PDC inserts (cutting/gauge)
0 (0/0)
Sealing
None
Total number of PDC inserts for back reaming
0
Total number of inserts (inner/heel row)
67 (31/36)
Total number of inserts (inner/heel row)
0 (0/0)
Total number of antivibration inserts
0
Total number of insert rows (inner/heel row)
7 (4/3)
Total number of insert rows (inner/heel row)
0 (0/0)
Number of changeable nozzles
0
Number of changeable nozzles
0
Connecting thread
З-66 (2 3/8 REG)
Connecting thread
З-66 (2 3/8 REG)
Drill bit height, mm
0.0
Drill bit net weight, kg
4.40
Drill bit gross weight, kg
4.90
Recommended Drilling Conditions
Rotation speed
100-40 rpm
Thrust load
4.00-9.00 t (8800 - 19800 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 medium hard formations
Design Features
Central flushing.
The shirttail and leg entering edge are hardfaced with tungsten carbide. The leg is protected with tungsten carbide inserts
One-sided coating of tooth surfaces with a hard alloy.
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