6 - 7 in QDG5316(152.4 - 177.8 mm)

ER 20053 IADC S243

Design Specifications

Total Cutters40
Cutter Size13mm (1/2 in), 16mm (5/8 in)
Face Cutters(10) 13mm, (30) 16mm
Gauge Cutters(10) 13mm, (30) 16mm
Drill Out Cutters(10) 13mm, (30) 16mm
Conditioning Cutters(10) 13mm, (30) 16mm
Blade Count8
Pilot Diameter4 3/4 in
Maximum Tool Diameter4 3/4 in
Nozzles3 Standard Series 30N
Junk Slot Area (sq in)15.85
Gauge Length4 1/2 in
Gauge ProtectionOptions Available
Upper Connection3 1/2-in Reg
Lower Connection2-7/8" API Reg. Box
LengthMake-Up: 22 3/8 in Overall: 26"
Fishing NeckDiameter: 4 1/2 in Length: 5 1/2 in

Operating Parameters

Rotary SpeedSuitable for Rotary & PDM
Weight-on-Bit4,000 To 35,000 (lbs)
1,818 To 15,908 (daN)
2 To 16 (Tonnes)
Flow Rate (GPM)200 To 500
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.