Case Study: High-Efficiency Drilling in Shihezi Formation with 8-3/4SD6563 PDC Bit
Client: Su 75-70-17X Drilling Team
Location: Ordos Basin, China
Date: Q1 2026
Provider: Shaanxi Hainaisen Petroleum Technology Co., Ltd.
Project Background
The Su 75-70-17X well is a key exploration well in the Ordos Basin, targeting tight gas reservoirs in the Permian Shihezi Formation. The Shihezi Formation is characterized by abrasive quartz sandstone interbeds and moderate to high drillability (5.3–5.6), which poses severe challenges to bit durability and drilling efficiency ⁶. Traditional roller cone bits in this formation often suffer from rapid wear, short single-bit footage, and low ROP (Rate of Penetration), leading to frequent tripping operations and increased drilling costs.
To address these pain points, the drilling team sought a high-performance PDC bit solution from Shaanxi Hainaisen Petroleum Technology Co., Ltd., aiming to optimize drilling parameters and achieve efficient, low-cost well construction.
Bit Selection & Technical Parameters
After rigorous geological analysis and simulation testing, Hainaisen’s R&D team customized the 8-3/4SD6563 PDC bit for the project, with core specifications as follows:
| Parameter | Value |
|---|---|
| Bit Model | 8-3/4SD6563 |
| Bit Number | 2183 |
| Formation | Shihezi Formation (Abrasive Sandstone) |
| Total Drilled Depth | 2770–3291 m |
| Pure Drilling Time | 43 hours |
| Total Footage | 521 meters |
| Average Mechanical ROP | 12.11 m/h |
Core Design Advantages
- Optimized Crown Profile: Adopts a double-arc crown structure to enhance cutting depth and stability in hard formations ⁶.
- High-Performance Cutters: Equipped with premium polycrystalline diamond compact (PDC) cutters, featuring excellent wear resistance and impact toughness to resist abrasion from quartz sandstone.
- Hydraulic Optimization: Precision-matched nozzle layout ensures efficient cooling and debris cleaning, reducing repeated cutting and bit wear ⁶.
- Wear-Resistant Gauge Protection: Reinforced gauge structure extends bit life in high-abrasion environments.
On-Site Construction & Performance
The 8-3/4SD6563 PDC bit was deployed in the 2770–3291 m well section of the Su 75-70-17X well, with strict adherence to site construction specifications:
- Parameter Matching: The team adopted moderate weight on bit (WOB) and optimized rotary speed, combined with high-displacement drilling fluid to ensure bottomhole cleaning.
- Continuous Drilling: The bit maintained stable torque throughout the 43-hour pure drilling period, with no severe vibration or cutter loss.
- Footage & ROP: Achieved a total footage of 521 meters and an average mechanical ROP of 12.11 m/h, far exceeding the project’s expected efficiency targets.
Client Feedback & Project Outcomes
Client Testimonial
“We have used multiple brands of PDC bits in the Shihezi Formation before, but the 8-3/4SD6563 from Shaanxi Hainaisen set a new benchmark. In the 43-hour pure drilling time, we didn’t encounter a single bit trip due to wear—this is unprecedented for us. The 12.11 m/h mechanical ROP directly shortened our drilling cycle by 18% compared to previous runs, and the cost per meter was reduced by approximately 22%. Hainaisen’s technical team provided on-site support throughout the process, and their understanding of formation characteristics is impressive. We will definitely prioritize this bit model for future projects in the Ordos Basin.”— Chief Engineer, Su 75-70-17X Drilling Team
Core Project Achievements
- Efficiency Improvement: The 12.11 m/h mechanical ROP is 35% higher than the average ROP of 8.9 m/h for conventional bits in the same formation ⁶.
- Cost Reduction: Eliminated 2 additional bit trips, saving approximately ¥18,000 in tripping and bit replacement costs alone.
- Reliability Verification: The bit maintained structural integrity after 521 meters of drilling, with minimal wear on cutters and gauge, proving its adaptability to high-abrasion Shihezi Formation conditions.
Hainaisen’s Technical Support
Shaanxi Hainaisen Petroleum Technology Co., Ltd. provided full-cycle technical services for the project:
- Pre-Drilling: Conducted geological modeling and bit performance simulation, formulating a customized drilling parameter plan tailored to the Shihezi Formation’s characteristics.
- On-Site Guidance: Technical engineers were stationed on-site to monitor real-time drilling data, adjusting parameters promptly to address formation changes.
- Post-Project Analysis: Conducted a detailed wear analysis of the used bit, providing data feedback to optimize the 8-3/4SD6563 design for future abrasive formation applications.
Conclusion
The successful application of the 8-3/4SD6563 PDC bit in the Su 75-70-17X well fully validates the technical strength of Shaanxi Hainaisen Petroleum Technology Co., Ltd. in addressing complex formation drilling challenges. For tight gas reservoirs in the Ordos Basin’s Shihezi Formation, this bit model has become a preferred solution for drilling teams seeking to balance efficiency and cost.
At Hainaisen, we remain committed to R&D and innovation, providing high-reliability drilling tools and professional technical services to global oil and gas, coalbed methane, and geological exploration industries.
Contact: hainaisen@hnsdrillbit.com | www.hnsdrillbit.com
