14 1/2 - 17 in QDR5313(368.3 - 431.8 mm)

ER 20662 IADC S243

Design Specifications

Total Cutters69
Cutter Size13mm (1/2 in), 16mm (5/8 in)
Face Cutters(63) 13mm, (6) 16mm
Gauge Cutters(63) 13mm, (6) 16mm
Drill Out Cutters(63) 13mm, (6) 16mm
Conditioning Cutters(63) 13mm, (6) 16mm
Blade Count8
Pilot Diameter10 5/8 in
Maximum Tool Diameter11 1/8 in
Nozzles5 Reamer Series 60N
Junk Slot Area (sq in)126.44
Gauge Length2 1/2 in
Gauge ProtectionOptions Available
Upper Connection7-5/8" API Reg. Box
Lower Connection6-5/8" API Reg.
LengthMake-Up: 57 3/4 in Overall: 62 11/16 in
Fishing NeckDiameter: 9" Length: 16 1/2 in

Operating Parameters

Rotary SpeedSuitable for Rotary & PDM
Weight-on-Bit8,000 To 40,000 (lbs)
3,636 To 18,180 (daN)
4 To 18 (Tonnes)
Flow Rate (GPM)700 To 1450
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.