8 1/2 - 9 7/8 in QDG7313(215.9 - 250.825 mm)

ER 1545 IADC S243

Design Specifications

Total Cutters46
Cutter Size13mm (1/2 in)
Face Cutters(46) 13mm
Gauge Cutters(46) 13mm
Drill Out Cutters(46) 13mm
Conditioning Cutters(46) 13mm
Blade Count8
Pilot Diameter6 1/2 in
Maximum Tool Diameter6 3/4 in
Nozzles2 Standard Series 60N
Junk Slot Area (sq in)35.4
Gauge Length2 3/4 in
Gauge ProtectionOptions Available
Upper Connection4-1/2" API Reg.
Lower Connection3-1/2" API Reg. Box
LengthMake-Up: 21 3/8 in Overall: 25 5/8 in
Fishing NeckDiameter: 6" Length: 1 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)400 To 850
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.