Case Study: 6-1/2" SD6522 PDC Bit Delivers Exceptional Performance in Taiyuan Formation, Sulige Gas Field
Client: CNPC Changqing Oilfield Company
Project Location: Sulige Gas Field, Ordos Basin, Inner Mongolia, China
Bit Model: 6-1/2" SD6522 Matrix Body PDC Bit
Service Provider: Shaanxi Hainaisen Petroleum Technology Co., Ltd. (HNS Drill Bit)
Website: https://www.hnsdrillbit.com/
Project Background
The Sulige Gas Field is a key tight gas development base in China, characterized by complex geological conditions in the Taiyuan Formation. The formation consists of hard, highly abrasive sandstone interbedded with mudstone, which imposes extreme challenges on drill bit performance:
- High rock hardness and abrasiveness lead to rapid bit wear and low ROP
- Interbedded layers cause frequent bit trips, increasing non-productive time (NPT)
- Operators require a bit solution that balances penetration rate, durability, and cost efficiency
In this well (Well No. 50503, Rig Team 3673), the operator aimed to optimize drilling performance in the 2980m Taiyuan Formation interval, targeting higher ROP, longer bit life, and reduced operational costs compared to offset wells.
Bit Design & Application Parameters
Bit Specifications
| Item | Details |
|---|---|
| Bit Size | 6-1/2" (165.1mm) |
| Bit Model | SD6522 Matrix Body PDC Bit |
| Bit Serial No. | 3005 |
| Cutter Type | Premium 13mm PDC cutters with enhanced wear resistance |
| Blade Design | 5-blade, optimized hydraulic structure for efficient cuttings removal |
| Application Interval | 2980m Taiyuan Formation |
Drilling Performance Data
| Parameter | Result |
|---|---|
| Total Footage Drilled | 693m |
| Net Drilling Time | 57 hours |
| Average ROP (Mechanical Penetration Rate) | 12.15 m/h |
| Well Team | 3673 |
| Well No. | 50503 |
| Formation | Taiyuan Formation (Sulige Gas Field) |
Field Performance & Results
Outstanding ROP & Drilling Efficiency
The 6-1/2" SD6522 PDC bit achieved an average ROP of 12.15 m/h in the hard, abrasive Taiyuan Formation, a 35% improvement over the offset well average ROP of ~9 m/h in the same interval. This high penetration rate significantly shortened the drilling cycle, reducing the well's total drilling time by over 2 days.
Exceptional Bit Durability & Single-Trip Completion
The bit completed the entire 693m Taiyuan Formation interval in one single trip, with no mid-drilling wear failure or bit replacement required. After pulling out of the hole, the bit showed minimal cutter wear and intact blade structure, retaining sufficient remaining life for further drilling. This eliminated the cost and time associated with multiple bit trips, directly reducing the operator's NPT and operational expenses.
Cost-Effective Solution
Compared to the operator's previous bit solutions in the same formation:
- Drilling cost per meter reduced by 28%
- Bit trip frequency reduced from 2-3 trips per interval to 1 trip
- Total well construction cost saved by over RMB 180,000 for this interval alone
Client Feedback
"We have been struggling with low ROP and frequent bit failures in the Taiyuan Formation of Sulige Gas Field for years. The SD6522 PDC bit from Hainaisen completely solved this pain point. The 12.15 m/h average ROP and single-trip completion of 693m far exceeded our expectations.
The bit's wear resistance and hydraulic design are top-notch, even in the highly abrasive sandstone layers. Hainaisen's technical team also provided on-site drilling parameter optimization guidance, which helped us maximize the bit's performance. We will continue to use Hainaisen's PDC bits in our subsequent Sulige Gas Field projects and highly recommend their products to other operators in the region."
—— Drilling Supervisor, Changqing Oilfield Company, Well Team 3673
About Shaanxi Hainaisen Petroleum Technology Co., Ltd.
Shaanxi Hainaisen Petroleum Technology Co., Ltd. (HNS Drill Bit) is a professional manufacturer of PDC drill bits, roller cone bits, and downhole tools for the oil & gas, mining, and geothermal drilling industries. Headquartered in Xi'an, Shaanxi, China, we focus on R&D, production, and sales of high-performance drilling tools, with a complete quality control system and professional technical support team.
Our core products include:
- Matrix body & steel body PDC drill bits for oil & gas, geothermal, and mining drilling
- TCI roller cone bits for hard formation drilling
- Customized drill bit solutions for complex geological conditions
- Downhole tools and drilling optimization services
We have served dozens of domestic and international oilfield operators, with our products widely used in major oil and gas fields in China, as well as in the Middle East, Central Asia, Southeast Asia, and other regions.
Website: https://www.hnsdrillbit.com/
Contact: For technical consultation and product inquiries, please reach out to our sales team via the official website.
