Description
5 7/8″ PDC Drill Bit — Model LS1655ER (IADC S323)
5-Blade PDC Drill Bit with φ16.05mm Cutters & W20 Nozzles for Soft to Medium-Hard Formations
Size: 5 7/8 in
IADC Code: S323
Blades: 5
Connection: 3 1/2″ API REG
Key Performance Advantages for Drilling Operations:
- Enhanced Cutting Shearing Efficiency: Engineered with a 5-blade profile and high-impact φ16.05mm PDC cutters to deliver aggressive rock cutting and high ROP in varied strata.
- High-Volume Fluid Circulation: Features 5 W20 nozzles supporting high hydraulic flow rates (12-20 Lps) for optimal cutter cooling, cleaning, and rapid cuttings removal.
- Stable Operational Envelope: Smooth directional control across 60-300 RPM, operating efficiently at a recommended WOB of 20-40 kN (max range 10-70 kN).
Product Overview & Technical Description
The LS1655ER is a premium 5 7/8″ PDC (Polycrystalline Diamond Compact) Drill Bit classified under IADC S323. Designed for optimal stability and aggressive penetration in soft to medium-hard rock layers, this bit incorporates a sturdy 5-blade structure armed with high-performance φ16.05mm PDC cutters.
Equipped with 5 W20 nozzles and a industry-standard 3 1/2″ API REG pin connection, the LS1655ER provides superior hole cleaning and hydraulic energy distribution at the hole bottom. Its 5-blade layout ensures reduced torque fluctuation, prolonged bit life, and excellent hole stability during both rotary and motor-driven drilling.
Technical Specifications — Model LS1655ER
| Parameter | Specification Value | Engineering Context / Notes |
|---|---|---|
| Bit Size | 5 7/8″ | Intermediate hole diameter standard |
| Bit Type | LS1655ER | PDC fixed-cutter series |
| IADC Code | S323 | Steel/Matrix body, soft to medium-hard formation rating |
| Number of Blade | 5 | 5-blade profile for optimized cutter layout and torque stability |
| Cutter Type | PDC | Polycrystalline Diamond Compact shear cutters |
| Primary Cutter Size | φ16.05 mm | High-durability shear cutters for rapid ROP |
| Nozzle Quantity | 5 | Balanced fluid distribution across all blade channels |
| Nozzle Type | W20 | W20 standard nozzle specification |
| Rotary Speed (RPM) | 60 – 300 RPM | Flexible speed compatibility for top drives and downhole motors |
| Weight On Bit (WOB) | 10 – 70 kN (Recommend 20 – 40 kN) | Balanced mechanical weight window for precise penetration control |
| Hydraulic Flow Rate | 12 – 20 Lps | High volumetric flow for efficient bottom-hole cleaning |
| Make Up Torque | 7.1 – 11.4 kN.m | Recommended API connection makeup torque |
| API Pin Connection | 3 1/2″ API REG | Standard 3 1/2 inch API Regular thread connection |
Field Problems Solved by LS1655ER PDC Bit
1. Problem: Bit Balling & Poor Hole Cleaning in Muddy Strata
Solution: The 5 W20 nozzle setup with 12-20 Lps fluid flow rate ensures continuous high-velocity cleaning across all 5 blade channels to prevent mud accumulation.
2. Problem: Torsional Vibration & Dynamic Instability
Solution: The 5-blade configuration balances cutting force distribution, minimizing stick-slip and torque spikes at speeds up to 300 RPM.
3. Problem: Rapid Cutter Chipping in Interbedded Rock
Solution: Heavy-duty φ16.05mm PDC cutters deliver enhanced impact resistance and wear resistance when transitioning through varying formation densities.
4. Problem: Inconsistent ROP Under Variable WOB
Solution: Optimized for a broad 10-70 kN WOB range (recommended 20-40 kN), ensuring smooth bit behavior and reliable penetration rates.
Recommended Operating Parameters & Guidelines
To maximize bit life and maintain optimal Rate of Penetration (ROP) with the 5 7/8″ LS1655ER PDC Bit, adhere to these operational guidelines:
- Weight on Bit (WOB): Maintain standard operation between 20 and 40 kN (acceptable range 10-70 kN). Apply weight smoothly upon initial bottom touch.
- Rotary Speed (RPM): Operate within 60 to 300 RPM based on formation characteristics and motor/top-drive capacity.
- Hydraulic Flow Rate: Keep fluid flow between 12 and 20 Lps for proper cutter cooling and rapid evacuation of drill cuttings.
- Make-up Torque: Tighten thread connection to 7.1 – 11.4 kN.m using proper API thread grease.
Frequently Asked Questions (FAQ)
