Field Case Study: 6-1/2” SD6431 PDC Bit – 426m Run in Taiyuan Formation, Su 25-34-31X Well
1. Project Overview
表格
| Parameter | Details |
|---|---|
| Bit Size & Model | 6-1/2” SD6431 PDC Bit |
| Serial No. | 2871 |
| Operator / Well No. | 50516 Crew / Su 25-34-31X |
| Formation Drilled | Taiyuan Formation (Medium-hard, abrasive interbedded sandstone/shale) |
| Interval Drilled | 2810 m – 3236 m (Total 426 m) |
| On-Bottom Hours | 36 hours |
| Average ROP | 11.83 m/h |
2. The Challenge
The Taiyuan Formation in the Su 25-34-31X well is known for its interbedded hard sandstone, abrasive siltstone, and sticky shale, which typically causes:
- High bit wear and short run lengths
- Low ROP due to vibration and stick-slip
- Increased non-productive time (NPT) from frequent trips
The operator needed a reliable PDC bit that could deliver high penetration rates without sacrificing durability, to cut drilling costs and finish the section on schedule.
3. Hainaisen’s Solution: 6-1/2” SD6431 PDC Bit
We deployed the 6-1/2” SD6431 PDC bit, purpose-built for medium-hard, interbedded formations. Key design features for this run:
- Optimized cutter geometry and blade layout to reduce stick-slip and vibration
- High-impact resistant cutters to handle abrasive sandstone sections
- Hydraulically balanced flow paths to prevent bit balling in sticky shale
4. Field Performance & Results
This single run achieved exceptional results for the 50516 drilling crew:
✅ 426 meters drilled in one bit run – No intermediate trips required
✅ 11.83 m/h average ROP – 20%+ faster than offset wells using competitor bits
✅ 36 hours on bottom with stable torque and minimal vibration
✅ No bit balling or major wear at the end of the run
5. Client Feedback
“The 6-1/2” SD6431 bit from Hainaisen performed way beyond our expectations on Su 25-34-31X.We completed the entire 426m Taiyuan section with just one bit, and the ROP was consistent all the way down.The smooth drilling saved us a full round trip and cut our drilling time by almost two days.The crew was impressed with how steady the bit ran, even through the hard sandstone layers.We’re already planning to use the same bit design on our next wells in this block.”— Drilling Superintendent, Well Su 25-34-31X
6. Why Choose Hainaisen PDC Bits?
This case proves our ability to deliver reliable, high-performance PDC bits tailored to your formation challenges:
- Proven performance in complex, interbedded formations across China’s major blocks
- Consistent ROP and longer bit life, reducing your drilling cost per meter
- Direct factory support, from bit selection to post-run analysis
Ready to optimize your drilling performance?Contact our engineering team today at hainaisen@hnsdrillbit.com visit www.hnsdrillbit.com to discuss your next project.
