Case Study: 6-1/2" SD6522 PDC Bit Overcomes Shiqianfeng Formation Challenges in Su 25-3-9X Well
Company: Shaanxi Hainaisen Petroleum Technology Co., Ltd
Website: https://www.hnsdrillbit.com/
Project Background
The Su 25-3-9X well, operated by the 40695 drilling crew of the 2005 drilling team, presented a distinct technical challenge at the 2645m–2980m well section. Drilling through the Shiqianfeng Formation meant confronting high formation hardness, severe drill bit wear, and frequent well leakage risks—conditions that often caused conventional PDC bits to suffer from low drilling efficiency, frequent tripping operations, and increased non-productive time (NPT).
To address these downhole risks and optimize drilling efficiency in this complex interval, the drilling team partnered with Shaanxi Hainaisen Petroleum Technology Co., Ltd. (HNS Drill Bit), selecting our 6-1/2" SD6522 series PDC bit (bit number: 2861) for the full section drilling operation.
Bit Performance Highlights
| Parameter | Actual On-Site Operation Data |
|---|---|
| Bit Specification | 6-1/2" SD6522 PDC Bit |
| Bit Number | 2861 |
| Drilling Interval | 2645m – 2980m |
| Total Footage Drilled | 335m |
| Net Drilling Time | 40 hours |
| Average Mechanical ROP | 8.37 m/h |
| Reason for Pulling Out | Well leakage (bit wear remained negligible) |
Key Performance Breakdown
Stable Drilling in High-Hardness Formation: The SD6522 bit maintained a consistent average ROP of 8.37 m/h in the high-hardness Shiganfeng Formation, outperforming the drilling efficiency of conventional bits used in adjacent wells by over 20%. Its optimized cutter structure adapted seamlessly to the formation’s dense lithology, avoiding severe cutter damage and ensuring stable penetration throughout the interval.
Single-Run Completion of Target Section: The bit successfully drilled the entire 335m target section in a single run, eliminating the need for mid-run bit replacement. This reduced tripping operations significantly, cutting down non-productive time and lowering the risk of downhole accidents associated with frequent bit trips.
Superior Durability Under Severe Conditions: The bit was pulled out solely due to well leakage issues unrelated to bit performance. Post-operation inspection confirmed that the PDC cutters and bit body remained intact with minimal wear, fully verifying the bit’s structural strength and wear resistance in high-hardness, leak-prone formations.
Effective Mitigation of Downhole Risks: The SD6522’s refined hydraulic design efficiently discharged cuttings, reduced bit balling, and minimized downhole vibration. This stability allowed the drilling crew to maintain precise wellbore control, effectively mitigating the risk of wellbore instability and ensuring smooth progress of the drilling operation.
Client Testimonial
"The Shiqianfeng Formation has always been a tough section for us—high hardness makes bit wear a big problem, and well leakage often interrupts operations. We chose Hainaisen’s SD6522 PDC bit for this interval, and it really lived up to our expectations.
We drilled 335 meters in 40 straight hours of net drilling, with a steady ROP of 8.37 m/h, and the bit was still in great condition when we pulled it out to handle well leakage. There were no unexpected bit failures or mid-run trips, which saved us a lot of time and costs. This bit’s performance in the high-hardness Shiganfeng Formation is solid, and we’ll continue to cooperate with Hainaisen for similar formations in future wells."
—— Drilling Supervisor, 40695 Drilling Crew, 2005 Drilling Team
Why HNS Drill Bit?
Shaanxi Hainaisen Petroleum Technology Co., Ltd. focuses on R&D and manufacturing of PDC bits tailored to China’s onshore oilfield geological characteristics. The SD6522 series is specifically designed for high-hardness, low-abrasion formations such as the Shiganfeng Group, with core advantages including:
High-Hardness Adaptable Cutters: Adopts premium wear-resistant PDC cutters, engineered to resist impact and wear in dense lithologies, ensuring long service life and stable ROP.
Optimized Structural Design: Balanced blade layout and hydraulic channel design enhance cuttings removal, reduce downhole vibration, and avoid bit balling in complex formations.
Field-Validated Reliability: Rigorously tested and verified in multiple high-hardness oilfield intervals, with proven performance in addressing downhole leakage and wear challenges.
Customized Technical Support: Our professional technical team provides on-site technical guidance, adjusts drilling parameters according to well conditions, and maximizes drilling efficiency for operators.
For more details about our PDC bit product portfolio and solutions, visit our official website: https://www.hnsdrillbit.com/
About Shaanxi Hainaisen Petroleum Technology Co., Ltd
Shaanxi Hainaisen Petroleum Technology Co., Ltd. is a professional manufacturer of oil drilling tools, focusing on R&D, production, sales and technical service of PDC bits, roller cone bits and downhole drilling tools. With years of industry experience and technological innovation capabilities, we provide reliable, cost-effective drilling solutions for oil and gas exploration and development enterprises at home and abroad, and escort the safe and efficient development of oil and gas resources.
