Case Study: 6-1/2" SD6523 PDC Bit Completes Full Taiyuan Formation Drilling in Su 25-3-9X Well
Company: Shaanxi Hainaisen Petroleum Technology Co., Ltd
Website: https://www.hnsdrillbit.com/
Project Background
For the 40695 drilling crew of the 2005 drilling team, the Taiyuan Formation in the Su 25-3-9X well has long been a critical bottleneck. This 2980m–3383m interval is characterized by ultra-hard carbonate lithology, high abrasiveness, and complex interbedded formations, which historically forced operators to use multiple bits per section, leading to frequent tripping, extended drilling cycles, and skyrocketing operational costs.
To break through this efficiency ceiling, the team partnered with Shaanxi Hainaisen Petroleum Technology Co., Ltd. (HNS Drill Bit), deploying our 6-1/2" SD6523 series PDC bit (bit number: 2162) for the full Taiyuan Formation drilling operation.
Bit Performance Highlights
| Parameter | Actual On-Site Operation Data |
|---|---|
| Bit Specification | 6-1/2" SD6523 PDC Bit |
| Bit Number | 2162 |
| Drilling Interval | 2980m – 3383m |
| Total Footage Drilled | 403m |
| Net Drilling Time | 50 hours |
| Average Mechanical ROP | 8.06 m/h |
| Reason for Pulling Out | Completion of target interval (full drill-through) |
Key Performance Breakdown
- Full Section Single-Run Completion: The SD6523 bit achieved a milestone by drilling the entire 403m Taiyuan Formation in a single run, with no mid-section bit replacement required. This eliminated 2+ tripping operations compared to conventional solutions, cutting non-productive time by over 40% for this interval.
- Stable Penetration in Ultra-Hard Formation: Maintaining an average ROP of 8.06 m/h through the ultra-hard, abrasive Taiyuan Formation, the bit outperformed offset well results by 22% in the same block. Its specialized cutter geometry and impact-resistant design ensured consistent penetration without premature wear.
- Zero Performance Degradation Through Full Interval: Pulled out only after completing the target depth, post-run inspection confirmed the bit’s cutters and body remained in excellent condition with minimal wear, proving its durability in the most demanding carbonate formations.
- Reduced Downhole Risk & Operational Cost: The bit’s optimized hydraulic and blade design minimized downhole vibration and cuttings accumulation, ensuring smooth, stable drilling. This reduced the risk of borehole instability and tool failures, directly lowering the well’s overall construction cost.
Client Testimonial
"The Taiyuan Formation is the hardest nut to crack in this block. For years, we’ve had to change bits multiple times just to get through this section, which eats up so much time and money. We tried Hainaisen’s SD6523 PDC bit on this well, and it completely changed the game.
We drilled 403 meters straight through the entire Taiyuan Formation in 50 hours of net drilling, with a steady ROP of 8.06 m/h, and the bit was still in great shape when we pulled it out after finishing the section. No mid-run trips, no unexpected downtime, just reliable performance from start to finish. This bit saved us a fortune on this well, and we’re making it our standard for all Taiyuan Formation drilling going forward."
—— Drilling Supervisor, 40695 Drilling Crew, 2005 Drilling Team
Why HNS Drill Bit?
At Shaanxi Hainaisen Petroleum Technology Co., Ltd., we engineer PDC bits specifically for the harshest geological conditions in Chinese onshore oilfields. The SD6523 series is purpose-built for ultra-hard, high-abrasion carbonate formations like the Taiyuan Group, with core advantages including:
- Premium Impact-Resistant PDC Cutters: Specially formulated for ultra-hard lithologies, delivering exceptional wear resistance and long service life
- Optimized Blade & Hydraulic Design: Balanced cutting structure and enhanced flow channels reduce vibration, improve cuttings removal, and prevent bit balling
- Field-Proven Reliability: Validated in hundreds of ultra-hard formation wells across major Chinese oilfields, with a track record of single-run full-section completion
- Customized Engineering Solutions: Our technical team works closely with operators to tailor bit designs to specific well conditions, maximizing drilling efficiency and cost savings
For more information about our PDC bit solutions, visit our official website: https://www.hnsdrillbit.com/
About Shaanxi Hainaisen Petroleum Technology Co., Ltd
Shaanxi Hainaisen Petroleum Technology Co., Ltd. is a professional manufacturer of oil drilling tools, dedicated to R&D, production, sales, and technical service of high-performance PDC bits, roller cone bits, and downhole drilling tools. With deep industry expertise and a focus on technological innovation, we provide reliable, cost-effective drilling solutions for oil and gas operators worldwide, supporting the safe and efficient development of global energy resources.
