5 3/4 - 6 1/2 in QDG5209(146.05 - 165.1 mm)

ER 20426 IADC S243

Design Specifications

Total Cutters25
Cutter Size9mm (3/8 in), 13mm (1/2 in)
Face Cutters(21) 9mm, (4) 13mm
Gauge Cutters(21) 9mm, (4) 13mm
Drill Out Cutters(21) 9mm, (4) 13mm
Conditioning Cutters(21) 9mm, (4) 13mm
Blade Count7
Pilot Diameter4 3/4 in
Maximum Tool Diameter5"
Nozzles2 Reamer Series 60N
Junk Slot Area (sq in)18
Gauge Length1"
Gauge ProtectionOptions Available
Upper Connection3 1/2-in Reg
Lower Connection2-7/8" API Reg. Box
LengthMake-Up: 19 5/16 in Overall: 22 49/50 in
Fishing NeckDiameter: 4 3/8 in Length: 1 5/8 in

Operating Parameters

Rotary SpeedSuitable for Rotary & PDM
Weight-on-Bit2,000 To 25,000 (lbs)
909 To 11,362 (daN)
1 To 11 (Tonnes)
Flow Rate (GPM)100 To 200
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.