18 1/8 - 22 in QDG5216(460.375 - 558.8 mm)

ER 20083 IADC S243

Design Specifications

Total Cutters57
Cutter Size16mm (5/8 in)
Face Cutters(57) 16mm
Gauge Cutters(57) 16mm
Drill Out Cutters(57) 16mm
Conditioning Cutters(57) 16mm
Blade Count7
Pilot Diameter12 1/4 in
Maximum Tool Diameter13 1/4 in
Nozzles3 Standard Series 60N
Junk Slot Area (sq in)241.13
Gauge Length1 1/2 in
Gauge ProtectionOptions Available
Upper Connection7-5/8" API Reg.
Lower Connection6-5/8" API Reg. Box
LengthMake-Up: 36 9/16 in Overall: 41 3/4 in
Fishing NeckDiameter: 9 5/16 in Length: 9 3/8 in

Operating Parameters

Rotary SpeedSuitable for Rotary & PDM
Weight-on-Bit2,000 To 38,000 (lbs)
909 To 17,271 (daN)
1 To 17 (Tonnes)
Flow Rate (GPM)800 To 1500
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.