Case Study: 8-1/2" SD6557B PDC Bit Delivers Exceptional Performance in Benxi Formation, Liaohe Oilfield

Client: Liaohe Oilfield (PetroChina)

Product: 8-1/2" SD6557B Matrix Body PDC Drill Bit

Application: Hard & Abrasive Benxi Formation Drilling

Location: Liaohe Oilfield, Northeast China

Posted by: Shaanxi Hainaisen Petroleum Technology Co., Ltd. 

🛢️ Project Background

The Liaohe Oilfield, one of China’s major onshore oil & gas production bases, has long faced challenges in drilling the Benxi Formation. This formation is characterized by extremely hard, highly abrasive sandstone and conglomerate interbeds, with frequent lithology changes that cause severe bit wear, low ROP, and frequent tripping operations.

For Well Su 75-48-20X, the operator required a PDC bit capable of:

• Drilling through the 2970–3717m Benxi Formation section in a single run
• Maximizing penetration rate to reduce overall drilling time and cost
• Withstanding high abrasion and impact loads to minimize bit failure risk

After evaluating multiple bit solutions, the operator selected Hainaisen’s 8-1/2" SD6557B PDC bit for the job, based on our proven track record in hard formation drilling in Northeast China.

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⚙️ Bit Design & Technical Advantages

The SD6557B is a matrix-body PDC bit engineered specifically for hard, abrasive formations. Key design features that drove this success include:

1. Premium PDC Cutters: Equipped with high-wear-resistance, impact-tough PDC cutters optimized for hard rock, ensuring long-lasting cutting performance in abrasive Benxi Formation.
2. Hydraulic Optimization: Customized nozzle layout and blade profile to maximize cuttings evacuation, prevent balling, and maintain consistent ROP at depth.
3. Robust Matrix Body: High-strength tungsten carbide matrix body for superior impact resistance, reducing the risk of bit damage in interbedded hard/soft formations.
4. Proven Cutting Structure: 5-blade design with balanced cutter placement, delivering both high ROP and extended bit life in hard rock applications.

📊 Field Performance Results

Key Performance Highlights

✅ Single Run Completion: The SD6557B drilled the entire 747m Benxi Formation section in one single run, eliminating the need for costly and time-consuming tripping operations.

✅ Industry-Leading ROP: Achieved an average net ROP of 11.86 m/h, 20-30% higher than offset wells using conventional PDC bits in the same formation.

✅ Exceptional Bit Durability: The bit maintained consistent cutting performance throughout the entire run, with minimal wear observed upon retrieval, demonstrating its superior abrasion and impact resistance.

✅ Significant Cost Reduction: Reduced the total drilling time for the Benxi Formation section by over 2 days, directly cutting rig time and operational costs for the operator.

🗣️ Client Testimonial (From Liaohe Oilfield Drilling Team)

"We’ve struggled with the Benxi Formation for years—bits wear out fast, ROP is slow, and we’re constantly tripping. The Hainaisen SD6557B bit was a game-changer for us. It drilled 747 meters in one run at 11.86 m/h, which is the best performance we’ve seen in this block. The bit held up perfectly through the hard conglomerate, and we cut our drilling time by almost 3 days. We’ll definitely be using Hainaisen bits for our future wells in the Liaohe Oilfield."— Drilling Supervisor, Liaohe Oilfield 50503 Drilling Crew

🏆 Why Choose Hainaisen PDC Bits?

At Shaanxi Hainaisen Petroleum Technology Co., Ltd. (Ninestones Superabrasives), we design and manufacture PDC bits that solve real-world drilling challenges. Our SD series PDC bits are engineered for:

• Hard, abrasive, and interbedded formations
• Maximum ROP and extended bit life
• Reduced drilling costs and operational downtime
• Customized solutions for specific well conditions and operator requirements

With over a decade of experience in the global oil & gas industry, we supply high-performance PDC bits and drilling tools to operators in China, the Middle East, Central Asia, and beyond.

📞 Let’s Solve Your Drilling Challenges

If you’re facing low ROP, high bit wear, or frequent tripping in hard/abrasive formations, our team of drilling engineers can design a custom PDC bit solution for your project.