9 1/2 - 10 3/4 in QDR5313(241.3 - 273.05 mm)

ER 2193 IADC S243

Design Specifications

Total Cutters35
Cutter Size9mm (3/8 in), 13mm (1/2 in), 16mm (5/8 in)
Face Cutters(10) 9mm, (20) 13mm, (5) 16mm
Gauge Cutters(10) 9mm, (20) 13mm, (5) 16mm
Drill Out Cutters(10) 9mm, (20) 13mm, (5) 16mm
Conditioning Cutters(10) 9mm, (20) 13mm, (5) 16mm
Blade Count8
Pilot Diameter7 7/8 in
Maximum Tool Diameter8"
Nozzles3 Standard Series 60N
Junk Slot Area (sq in)41.8
Gauge Length1 1/2 in
Gauge ProtectionOptions Available
Upper Connection4-1/2" API IF Box
Lower Connection4-1/2" API Reg. Box
LengthMake-Up: 48 7/8 in Overall: 53 5/16 in
Fishing NeckDiameter: 6 1/2 in Length: 16 9/16 in

Operating Parameters

Rotary SpeedSuitable for Rotary & PDM
Weight-on-Bit2,000 To 10,000 (lbs)
909 To 4,545 (daN)
1 To 4 (Tonnes)
Flow Rate (GPM)450 To 900
Hydraulic Horsepower (HSI)1 To 6
The operating parameters listed here are general parameters, please contact your local Schlumberger representative for precise recommendations for your individual well.


Pilot conditioning section improves tool stability & by stress relieving the formation with this intermediate stage, drilling the larger hole can be done at a more aggressive ROP

Drill collar connections allow flexible drillstring placement to optimize reamer and BHA performance.

Both the pilot hole section and the reamer cutting structure contain PDC inserts & carbide hardfacing on gauge to maintain hole integrity and extend tool life.

Short gauge length improves directional responsiveness without compromising hole integrity or tool stability.