8-3/4" SD6562 PDC Bit: High-Efficiency Drilling Case in Liujiagou Formation, Sulige Gas Field

Published by: Shaanxi Hainaisen Petroleum Technology Co., Ltd

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

Project Background: The Long-Standing Pain Point of Liujiagou Formation Drilling

The Sulige Gas Field is a core onshore natural gas production base in China. For Well Su 75-70-17X operated by Drilling Crew 50056, drilling through the Liujiagou Formation has long been a persistent, costly challenge:

• The Liujiagou Formation consists mainly of medium-hard to hard sandstone with extremely high abrasiveness. Conventional Polycrystalline Diamond Compact (PDC) bits commonly suffer from rapid cutter wear and chipping, with single-bit footage rarely exceeding 600m and average rate of penetration (ROP) hovering around 15-18 m/h.
• Frequent tripping operations for bit replacement not only drags out the drilling cycle significantly, but also adds extra operational costs and on-site safety risks. The crew was under immense pressure to meet the operator’s tight schedule.
• Prior to this project, the crew had tested bits from multiple suppliers, with most failing to deliver on promised performance—either underperforming drastically in the field despite impressive lab specs, or being overpriced with poor cost-effectiveness. The crew was in urgent need of a PDC bit truly tailored to the local formation that could deliver tangible efficiency gains.

  

   

Hainaisen Customized Technical Solution

Targeting the unique formation characteristics of the Liujiagou Formation in the Sulige Gas Field, Hainaisen’s technical team matched the 8-3/4" SD6562 PDC Bit for Drilling Crew 50056, with core optimizations focused on:

1. Optimized Blade & Cutter Placement: 5-blade impact-resistant design, with adjusted cutter density specifically for medium-hard abrasive sandstone, balancing drilling efficiency and wear resistance.
2. Upgraded Cutter Performance: High-wear-resistance, impact-resistant PDC cutters are adopted to enhance anti-chipping and anti-abrasion properties, drastically extending bit service life.
3. Hydraulic Structure Optimization: Redesigned nozzle layout and flow channels to improve cuttings carrying efficiency, effectively preventing bit balling and ensuring stable drilling over long intervals.

Field Drilling Performance Data (Well Su 75-70-17X)

Data Note: ROP = Total Footage ÷ Net Drilling Time (880m ÷ 35h ≈ 25.14m/h). All data is sourced from on-site daily drilling reports and is fully verifiable.

On-Site Crew Feedback (Engineer Li, Drilling Crew 50056)

"To be honest, we didn’t have high hopes when we switched to Hainaisen’s bit at first—we’d been burned by too many suppliers before. But this time, we drilled straight from 1980m to 2860m in one run, hitting 880m total footage with only 35 hours of net drilling time. The average ROP jumped to over 25m/h, which is a nearly 40% efficiency boost compared to the bits we used before!We checked the bit carefully after tripping out: the cutters showed uniform wear, no chipping or loss, and the gauge was perfectly intact. We thought this bit was done, but it’s actually still good for another run.Hainaisen’s bits are truly optimized for the Sulige formation, not just generic off-the-shelf products. From now on, we’re sticking with Hainaisen’s SD series bits for all Liujiagou Formation intervals in our crew. It’s saved us so much time and money, and we can finally meet the operator’s schedule without stress."

Hainaisen Technical Summary

Since its establishment, Shaanxi Hainaisen Petroleum Technology Co., Ltd has always adhered to the R&D philosophy of "centering on on-site oilfield needs". We never produce "lab-only products" with impressive paper specs—we only deliver PDC bits that drive tangible efficiency and cost reduction in real field operations:

• The application of the SD6562 bit in the Sulige Gas Field achieved outstanding performance: 880m single-bit footage and 25.14m/h average ROP. Compared with conventional bits in the block, this represents an over 47% increase in footage and over 39% improvement in ROP, drastically shortening the drilling cycle and reducing overall operational costs.
• Hainaisen boasts a full-chain capability covering PDC bit R&D, manufacturing, and on-site technical service. We provide exclusive services from bit selection, on-site tracking to customized design for global clients.
• For more bit application cases, technical specifications, or to get a customized bit solution for your operation block, please visit our official website: https://www.hnsdrillbit.com/ or contact our technical team directly.