Case Study: High-Performance PDC Bit Delivers Exceptional ROP in Su 75-46-20X Well
Project Overview
Client: Su 75-46-20X Well Drilling Team
Location: Ordos Basin, China
Formation: Shihezi Formation
Service Provider: Shaanxi Hainaisen Petroleum Technology Co., Ltd.
Challenge: Achieve efficient drilling with consistent rate of penetration (ROP) in complex Shihezi Formation while minimizing non-productive time (NPT).
Drilling Parameters & Bit Specification
| Item | Detail |
|---|---|
| Bit Model | 8-1/2SD6557 PDC Drill Bit |
| Bit Serial Number | 196841 |
| Operating Well Section | 2880 - 3410 m |
| Well ID | 50503 |
| Total Drilling footage | 530 m |
| Pure Drilling Time | 40 h |
Client's Pain Points
The client faced two core challenges during the drilling phase of the Su 75-46-20X well:
- Low ROP in Hard Formations: The Shihezi Formation is characterized by high abrasiveness and interbedded sandstone-mudstone layers, which caused frequent bit balling and reduced drilling efficiency with conventional bits.
- Cost Control Pressure: Tight project timelines required minimizing bit replacements and maintenance, demanding a PDC bit that could deliver stable performance over the entire interval.
Hainaisen's Solution
Shaanxi Hainaisen Petroleum Technology Co., Ltd. customized a 8-1/2SD6557 PDC drill bit for the client, tailored to the geological characteristics of the Shihezi Formation:
- Optimized cutter layout: The bit adopted a high-density cutter arrangement with premium polycrystalline diamond compact (PDC) cutters, enhancing wear resistance and impact toughness against the formation’s abrasiveness.
- Specialized hydraulics: Designed unique nozzle ports and flow channels to effectively clean the bottom hole, prevent cutter balling, and maintain continuous rock cutting efficiency.
- Structural reinforcement: Strengthened the bit crown and gauge protection structure to withstand high axial and lateral loads during deep well drilling, ensuring structural integrity in the 2880-3410 m interval.
Performance Results
| Metric | Value | Industry Standard Comparison |
|---|---|---|
| Mechanical ROP | 13.25 m/h | 20-30% higher than conventional bits in similar formations |
| Total Drilling Time | 40 h | 15% shorter than average project duration |
| No Bit Replacements | 1 | Zero mid-run bit changes, eliminating NPT |
| Total Footage | 530 m | Exceeded client’s expected footage by 12% |
Client Feedback
"We’ve worked with several PDC bit suppliers before, but Hainaisen’s 8-1/2SD6557 bit stood out significantly. The mechanical ROP reached 13.25 m/h, which is far beyond our usual results in the Shihezi Formation. What impressed us most was the bit’s stability throughout the 530-meter interval—no balling issues, no structural damage, and we didn’t need to stop for bit changes once. This not only saved us significant non-productive time but also reduced our overall drilling costs. Shaanxi Hainaisen’s technical team provided on-site support to match the bit perfectly with our drilling parameters, and we’re confident in partnering with them for future projects."
Project Value
- Efficiency Boost: The 13.25 m/h mechanical ROP set a new benchmark for drilling efficiency in the Su 75-46-20X well, accelerating the well’s completion schedule by nearly two weeks.
- Cost Reduction: Eliminating bit replacements and reducing drilling time cut the client’s drilling cost per meter by 18%, delivering substantial economic benefits.
- Technical Validation: The success of the 8-1/2SD6557 bit in the Shihezi Formation validated Hainaisen’s ability to customize PDC bits for complex continental clastic rock formations, strengthening our market competitiveness in China’s Ordos Basin oilfield services.
About Shaanxi Hainaisen Petroleum Technology Co., Ltd.
Shaanxi Hainaisen Petroleum Technology Co., Ltd. is a professional manufacturer and service provider of petroleum drilling tools, focusing on R&D, production and sales of PDC bits, roller bits and related drilling accessories. With advanced manufacturing equipment and a professional technical team, we provide customized drilling solutions for global oilfield customers, adhering to the concept of "high efficiency, reliability and customer-centricity". Our products are widely used in conventional oil & gas wells, shale gas wells and geothermal wells, serving customers in China, the Middle East, Central Asia and other regions.
