10 5/8 - 12 1/4 in QDR5313(269.875 - 311.15 mm)

ER 2065 IADC S243

Design Specifications

Total Cutters43
Cutter Size13mm (1/2 in), 16mm (5/8 in)
Face Cutters(38) 13mm, (5) 16mm
Gauge Cutters(38) 13mm, (5) 16mm
Drill Out Cutters(38) 13mm, (5) 16mm
Conditioning Cutters(38) 13mm, (5) 16mm
Blade Count8
Pilot Diameter8 1/2 in
Maximum Tool Diameter8 5/8 in
Nozzles3 Standard Series 60N
Junk Slot Area (sq in)51.5
Gauge Length1 1/2 in
Gauge ProtectionOptions Available
Upper Connection6-5/8" API Reg. Box
Lower Connection4-1/2" API IF Pin
LengthMake-Up: 56 11/16 in Overall: 60 7/8 in
Fishing NeckDiameter: 8" Length: 18 13/16 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)500 To 1200
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.