High-Performance PDC Bit Delivers Stable Drilling in Taiyuan Formation (Well Su 25-3-11)
Project Background
Well Su 25-3-11 is a conventional development well in the Sulige Gas Field, Ordos Basin. The Taiyuan Formation interval (2430m–3350m) in this well is characterized by high hardness, strong abrasiveness, and complex lithology, which historically leads to low ROP, severe bit wear, and frequent tripping, significantly increasing drilling costs and cycle time.
Application Solution
To address the challenges of the Taiyuan Formation, our 6-1/2" SD6523 PDC Bit (Bit Serial No. 2395) was deployed for the full 2430m–3350m interval. This bit was engineered with optimized cutter layout and enhanced impact resistance, specifically tailored for hard, abrasive formations in the Sulige block.
Key Application Data
| Item | Core Parameter |
|---|---|
| Bit Size & Model | 6-1/2" SD6523 PDC Bit |
| Bit Serial No. | 2395 |
| Drilling Interval | 2430m – 3350m |
| Drilling Crew | Crew 40695 |
| Well No. | Su 25-3-11 |
| Drilled Formation | Taiyuan Formation |
| Total Footage Drilled | 920m |
| Net Drilling Time | 78h |
| Average ROP | 11.79m/h |
| Reason for Tripping | Drilling Completion |
Performance Highlights
1. Reliable Penetration in Hard, Abrasive Formations
The SD6523 bit delivered consistent performance throughout the entire 920m Taiyuan Formation interval, completing the section with a single bit. Its advanced PDC cutters and robust bit body resisted the high abrasiveness of the formation, eliminating premature tripping due to bit wear or failure.
2. Optimized ROP for Cost & Time Savings
With an average ROP of 11.79m/h in the hard Taiyuan Formation, the SD6523 outperformed conventional bits used in the same block. This directly shortened the drilling cycle for this critical interval, reducing rig time and overall operational costs for the operator.
3. Seamless Completion of Target Interval
The bit was only tripped after successfully reaching the target depth, with no mid-drilling issues. It demonstrated excellent stability and steerability, ensuring smooth drilling operations and full compliance with the well construction plan.
Customer Feedback
The on-site drilling engineer of Crew 40695 stated:
"The SD6523 bit exceeded our expectations in the Taiyuan Formation of Well Su 25-3-11. It completed 920m of hard, abrasive formation with a single run, maintaining a stable ROP throughout. No bit-related downtime, no premature tripping—this bit helped us finish the interval on schedule and under budget. We will definitely use this model for future wells in the Sulige block."
About Shaanxi Hainaisen Petroleum Technology Co., Ltd.
Shaanxi Hainaisen Petroleum Technology Co., Ltd. (https://www.hnsdrillbit.com/) is a leading provider of high-performance drilling tools for the oil & gas industry. We specialize in the R&D, manufacturing, and sales of premium PDC bits, engineered to tackle the most challenging formations worldwide. Our products are tailored to meet the specific needs of different blocks and drilling conditions, delivering reliable performance, improved efficiency, and reduced costs for our customers.
For more technical details on the SD6523 PDC bit, or to discuss a customized solution for your drilling project, please contact our technical team today.
