Case Study: High-Efficiency PDC Bit Application in Su 25-35-27 Well (Taiyuan Formation)
Client: Independent Oil & Gas Drilling Contractor (China Onshore)
Service Provider: Shaanxi Hainaisen Petroleum Technology Co., Ltd
Application Date: Q1 2026
Core Product: 6-1/2SD6333 PDC Drill Bit (Item No. 2793)
Project Overview
The client’s onshore drilling team faced persistent challenges in the Su 25-35-27 well, targeting the Taiyuan Formation—a stratigraphic unit known for variable hardness and moderate abrasivity. The well, assigned to rig 50516 with a section depth range of 2384m to 3236m, required a drilling solution that could balance mechanical drilling speed and bit durability to minimize non-productive time (NPT).
Prior to partnering with Hainaisen, the client tested third-party PDC bits in the same formation, resulting in low penetration rates and frequent bit replacement due to premature cutter wear. This drove the client to collaborate with Shaanxi Hainaisen, a trusted manufacturer specializing in custom PDC bit design for Chinese onshore formations, for a tailored solution.
Technical Challenge
- Formation Complexity: The Taiyuan Formation features interbedded sandstone and mudstone, with localized abrasive interlayers that cause uneven cutter wear and torque fluctuations.
- Efficiency Targets: The client required a minimum mechanical drilling speed of 15 m/h to meet the project’s timeline, while ensuring the bit could complete the full 852m section without tripping.
- Rig Compatibility: The 6-1/2" hole section demanded a compact PDC bit design with stable bottom-hole assembly (BHA) performance to avoid vibration issues.
Hainaisen Customized Solution
Shaanxi Hainaisen’s R&D team analyzed the client’s formation data and rig parameters, then optimized the 6-1/2SD6333 PDC drill bit (Item No. 2793) for the Su 25-35-27 well with three core enhancements:
| Optimization Aspect | Technical Design | Purpose |
|---|---|---|
| Cutter Structure | Premium grade polycrystalline diamond compact (PDC) cutters with 13mm diameter; optimized back-rake angle | Enhance wear resistance in abrasive Taiyuan Formation interlayers |
| Blade Geometry | 6-blade symmetrical design with reduced gauge length | Improve stability during high-RPM drilling; minimize gauge wear |
| Hydraulic System | Optimized nozzle arrangement (3 nozzles) | Enhance bottom-hole cleaning; reduce cutter balling |
Beyond product customization, Hainaisen’s technical team provided on-site parameter guidance, including recommended weight on bit (WOB: 25-35 kN) and rotary speed (RPM: 120-180), to ensure the bit operated within its optimal performance window.
On-Site Performance Data
| Parameter | Actual Result | Industry Benchmark (Similar Formations) |
|---|---|---|
| Total Drilled Depth | 852 m | 700-800 m (average) |
| Pure Drilling Time | 51 hours | 60-70 hours (average) |
| Mechanical Drilling Speed | 16.7 m/h | 14-15 m/h (average) |
| Bit Wear Condition | Minimal gauge wear; cutters intact | Moderate to severe cutter wear |
| Tripping Frequency | 0 (one bit completed the section) | 2-3 times (average) |
Client Feedback
“We’ve been searching for a reliable PDC bit supplier for Taiyuan Formation drilling for years. The 6-1/2SD6333 bit from Shaanxi Hainaisen exceeded our expectations. The mechanical drilling speed reached 16.7 m/h, a 12% increase compared to our previous bits, and we completed the entire 852m section without replacing the bit—this saved us nearly 10 hours of tripping time. The on-site technical support from Hainaisen was also exceptional, with their team adjusting drilling parameters in real time to maximize efficiency. We’ve already signed a long-term supply agreement with Hainaisen for our future Su oilfield projects.”—— Chief Drilling Engineer, Rig 50516 Drilling Team
Project Value & Conclusion
For the Su 25-35-27 well, the Hainaisen 6-1/2SD6333 PDC bit delivered quantifiable operational and economic benefits:
- Efficiency Gains: 12% higher mechanical drilling speed reduced total drilling time for the section by 8 hours.
- Cost Reduction: Eliminated bit replacement and tripping costs, saving approximately $1,200 in direct expenses per well section.
- Reliability: Proven performance in the Taiyuan Formation validated Hainaisen’s capability to design formation-specific PDC bits for Chinese onshore oilfields.
This case underscores Shaanxi Hainaisen Petroleum Technology Co., Ltd’s commitment to delivering engineered drilling solutions—not just standard products. Our in-house R&D team, combined with on-site technical support, ensures our PDC bits address the unique challenges of diverse Chinese formations, driving tangible value for our global clients.
Why Choose Hainaisen?
- 10+ Years of Expertise: Specialized in PDC drill bit R&D and manufacturing for oil & gas, coal mining, and geological drilling since 2013.
- Customization Capability: Tailor bit design (size, cutter type, blade count) to specific formations and rig parameters.
- ISO 9001 Quality Standards: Strict quality control ensures batch consistency and long service life.
- Global Technical Support: On-site parameter guidance and real-time problem-solving for global projects.
Contact Us: www.hnsdrillbit.com | Email: hainaisen@hnsdrillbit.com | WhatsApp: +86 17791389758
