9 1/4 - 10 1/4 in QDG5313(234.95 - 260.35 mm)

ER 2007 IADC S243

Design Specifications

Total Cutters37
Cutter Size13mm (1/2 in), 16mm (5/8 in)
Face Cutters(32) 13mm, (5) 16mm
Gauge Cutters(32) 13mm, (5) 16mm
Drill Out Cutters(32) 13mm, (5) 16mm
Conditioning Cutters(32) 13mm, (5) 16mm
Blade Count8
Pilot Diameter7 7/8 in
Maximum Tool Diameter8"
Nozzles3 Standard Series 60N
Junk Slot Area (sq in)36
Gauge Length1 1/2 in
Gauge ProtectionOptions Available
Upper Connection4-1/2" API Reg.
Lower Connection4-1/2" API Reg. Box
LengthMake-Up: 24 1/8 in Overall: 28 5/16 in
Fishing NeckDiameter: 6" Length: 1 13/16 in

Operating Parameters

Rotary SpeedSuitable for Rotary & PDM
Weight-on-Bit5,000 To 34,000 (lbs)
2,272 To 15,453 (daN)
2 To 15 (Tonnes)
Flow Rate (GPM)250 To 800
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.