13 7/8 - 17 in QDG7313(352.425 - 431.8 mm)

ER 1605 IADC S243

Design Specifications

Total Cutters69
Cutter Size13mm (1/2 in)
Face Cutters(69) 13mm
Gauge Cutters(69) 13mm
Drill Out Cutters(69) 13mm
Conditioning Cutters(69) 13mm
Blade Count8
Pilot Diameter9 7/8 in
Maximum Tool Diameter10 1/8 in
Nozzles3 Standard Series 60N
Junk Slot Area (sq in)126.3
Gauge Length1 1/2 in
Gauge ProtectionOptions Available
Upper Connection7-5/8" API Reg.
Lower Connection6-5/8" API Reg.
LengthMake-Up: 29" Overall: 34 3/16 in
Fishing NeckDiameter: 9 1/4 in Length: 3 1/8 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)700 To 1200
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.