Case Study: 6-1/2" SD6541 PDC Bit Delivers Exceptional Performance in Liujiaogou Block, Sulige Gas Field

Customer: CNPC Changqing Oilfield Company

Project Location: Liujiaogou Block, Sulige Gas Field, Ordos Basin, China

Bit Supplier: Shaanxi Hainaisen Petroleum Technology Co., Ltd. (HNS Drill Bit)

Website: https://www.hnsdrillbit.com/

Project Background

The Sulige Gas Field is one of the largest tight gas reservoirs in China, characterized by highly abrasive sandstone formations, interbedded hard layers, and complex lithology that poses severe challenges to drilling operations. The Liujiaogou Block, in particular, is known for its high rock hardness and severe bit wear, which historically resulted in low ROP (rate of penetration), frequent bit trips, and extended drilling cycles.

For Well 50503, operated by the 2980# Drilling Crew, the customer’s core requirements were clear:

Achieve a single-run drilling depth of over 1,900m in the 75-47-20X target interval

Significantly improve ROP to reduce drilling time and operational costs

Minimize bit wear to ensure wellbore quality and avoid downhole accidents

Bit Selection & Technical Solution

After a detailed analysis of the formation lithology, drilling parameters, and historical performance data in the block, Hainaisen’s technical team recommended the 6-1/2" SD6541 PDC Bit (Bit Serial No. 3025) for this well.

Key Design Features of the SD6541 Bit:

Cutting Structure: Optimized 13mm cylindrical PDC cutters with a high-wear-resistant diamond layer, tailored for hard and abrasive sandstone formations

Hydraulic System: Enhanced nozzle layout and flow channel design to improve cuttings removal efficiency and reduce bit balling

Body Material: High-strength steel body with premium hardfacing, ensuring excellent impact resistance and structural stability

Profile Design: Balanced parabolic profile to maintain stable drilling and reduce vibration in complex formations

On-Site Drilling Performance

Drilling Parameters & Results

Performance Highlights

Unprecedented Single-Run Footage: The SD6541 bit completed 1,991m of drilling in a single run, far exceeding the customer’s expected 1,800m target, eliminating the need for a mid-run bit trip.

Significant ROP Improvement: The average ROP of 30.63 m/h is 42% higher than the block’s historical average of 21.5 m/h for the same interval, drastically reducing the drilling cycle.

Excellent Bit Condition After Pullout: Upon retrieval, the bit showed minimal wear on the cutters and gauge, with no chipping or breakage, confirming its outstanding durability in abrasive formations.

Stable Drilling Performance: The bit maintained consistent ROP throughout the entire interval, with no downhole accidents, wellbore deviation, or bit balling issues, ensuring smooth operations.

Customer Feedback

“We’ve been struggling with low ROP and frequent bit failures in the Liujiaogou Block for years. The 6-1/2" SD6541 PDC bit from Hainaisen completely changed the game.

This bit drilled 1,991 meters in one run at an average speed of over 30 m/h, cutting our drilling time for this interval by nearly 3 days. The bit condition after pulling out was far better than any other brand we’ve used before.

What impressed us most is not just the bit performance, but Hainaisen’s technical support. Their team came to the rig site before drilling, analyzed our formation data, and adjusted the bit design specifically for our block. They also provided on-site guidance during the entire drilling process.

We’ve already placed a follow-up order for 8 more SD6541 bits for our next batch of wells in the Sulige Gas Field. Hainaisen is now our preferred PDC bit supplier for tight gas drilling.”

—— Drilling Supervisor, 2980# Drilling Crew, Changqing Oilfield

 Project Value & Conclusion

Cost & Efficiency Benefits

Drilling Time Reduction: Saved 3+ days of rig time for this well, equivalent to a cost reduction of over ¥300,000

Bit Cost Savings: Eliminated 1 bit trip, saving an additional ¥80,000 in bit and tripping costs

Operational Risk Reduction: Minimized downhole accidents and wellbore quality issues, reducing potential hidden costs

Conclusion

The successful application of the 6-1/2" SD6541 PDC Bit in Well 50503 fully demonstrates Hainaisen’s technical strength in designing and manufacturing high-performance PDC bits for complex tight gas formations. By combining customized bit design, on-site technical support, and rigorous quality control, Hainaisen has helped the customer achieve a breakthrough in drilling efficiency and cost control in the Sulige Gas Field.

Shaanxi Hainaisen Petroleum Technology Co., Ltd. remains committed to providing reliable, high-performance drilling tools and comprehensive technical solutions for oil and gas exploration and development worldwide.

Contact Us:For more information about our PDC bit products and customized solutions, please visit our official website: https://www.hnsdrillbit.com/