Case Study: 6SD6532 PDC Bit Delivers High-Efficiency Drilling in Su 766-5-31SX Well, Shihezi Formation
Customer: Shaanxi Hainaisen Petroleum Technology Co., Ltd.
Website: https://www.hnsdrillbit.com/
Project Location: Ordos Basin, Sulige Gas Field
Well Type: Vertical Gas Well
Target Formation: Shihezi Formation (tight sandstone with high abrasiveness and medium hardness)
1. Project Background & Challenges
The Sulige Gas Field is a key natural gas production base in China, and the Shihezi Formation is one of the main target layers for gas exploration and development. This formation is characterized by:
- High abrasiveness of tight sandstone, leading to severe wear on drill bits and short service life
- Heterogeneous lithology with interbedded hard and soft layers, which easily causes bit bounce and reduces drilling efficiency
- Strict requirements for drilling cycle and cost control in large-scale cluster well development
For the Su 766-5-31SX well, the customer faced a critical challenge: the 3400m-4100m well section in the Shihezi Formation had historically low ROP (rate of penetration) and frequent bit trips, which extended the drilling cycle and increased operational costs. The customer turned to Shaanxi Hainaisen Petroleum Technology Co., Ltd. for a customized PDC bit solution to improve drilling efficiency.
2. Solution: 6SD6532 PDC Bit Customized for Shihezi Formation
Our engineering team conducted a detailed analysis of the formation lithology, drilling parameters, and historical bit performance of the block, and selected the 6SD6532 PDC bit (bit serial number: 193982) for this well section. The bit is designed with the following core advantages:
- High-wear-resistant PDC cutters: Adopt imported high-quality diamond composite sheets with optimized cutter spacing and back rake angle, which can effectively resist the abrasion of tight sandstone and maintain sharpness for a long time
- Stable hydraulic structure: Optimized nozzle layout and flow channel design, which can effectively carry cuttings, reduce bit balling, and improve cooling efficiency
- Robust bit body structure: High-strength steel body with enhanced impact resistance, which can adapt to the impact load caused by heterogeneous lithology and reduce the risk of bit damage
3. On-Site Drilling Performance
The 6SD6532 PDC bit was used in the 3400m-4100m well section of the Su 766-5-31SX well, with the following on-site performance data:
| Parameter | Actual Result |
|---|---|
| Drilling Interval | 3400m – 4100m |
| Total Footage Drilled | 700m |
| Net Drilling Time | 110h |
| Average Mechanical ROP | 6.36m/h |
| Formation | Shihezi Formation (tight sandstone) |
| Bit Condition After Pulling Out | Cutters intact, no severe wear, can be reused for similar formations |
Performance Comparison with Historical Bits
| Index | 6SD6532 PDC Bit (Hainaisen) | Conventional PDC Bit (Competitor) | Improvement |
|---|---|---|---|
| Average ROP | 6.36m/h | ~4.5m/h | +41.3% |
| Single Bit Footage | 700m | ~450m | +55.6% |
| Drilling Time for 700m Section | 110h | ~155h | -29% (time saved) |
| Bit Trip Frequency | 1 trip for 700m | 2 trips for 700m | -50% |
4. Customer Real Feedback
"We have been cooperating with Hainaisen for many years, and their PDC bits have always been reliable. For the Su 766-5-31SX well, the 6SD6532 bit exceeded our expectations in the Shihezi Formation. The average ROP reached 6.36m/h, which is 40% higher than the bits we used before. We only used one bit to complete the 700m well section, saving nearly 45 hours of drilling time and one bit trip. This not only greatly reduces our drilling cost, but also shortens the well construction cycle, which is very helpful for our large-scale cluster well development.
What's more, the after-sales service of Hainaisen is very timely. Their engineers came to the site to guide the drilling parameters before the bit went down, and tracked the whole process during the drilling. They adjusted the drilling parameters in time according to the formation changes, which ensured the stable performance of the bit. We will continue to use Hainaisen's PDC bits in subsequent wells and recommend them to other drilling teams in the block."
—— Drilling Supervisor, 40695 Drilling Crew
5. Project Conclusion & Value
The successful application of the 6SD6532 PDC bit in the Su 766-5-31SX well fully verifies the excellent performance of Hainaisen's PDC bits in high-abrasiveness tight sandstone formations. The project achieved:
✅ Significant improvement in drilling efficiency: ROP increased by 41.3%, drilling time reduced by 29%
✅ Cost reduction and efficiency increase: Single bit footage increased by 55.6%, bit trip frequency reduced by 50%, saving a lot of bit cost and operational cost
✅ Stable and reliable performance: Adapted to the complex lithology of the Shihezi Formation, with no bit failure during the whole process, ensuring safe and efficient drilling
Shaanxi Hainaisen Petroleum Technology Co., Ltd. has been committed to providing customized drilling tool solutions for oil and gas fields. We have a professional R&D team and perfect after-sales service system, which can provide customers with high-performance PDC bits, roller cone bits and other drilling tools for different formations and well types.
If you are facing the problem of low drilling efficiency and high cost in complex formations, please contact us through https://www.hnsdrillbit.com/ , and we will provide you with a customized solution!
About Shaanxi Hainaisen Petroleum Technology Co., Ltd.
Shaanxi Hainaisen Petroleum Technology Co., Ltd. is a high-tech enterprise integrating R&D, production, sales and service of oil drilling tools. The company's main products include PDC bits, roller cone bits, core bits, etc., which are widely used in oil and gas exploration, geothermal drilling, mining and other fields. With advanced production technology, strict quality control and professional technical services, the company has won the trust of customers at home and abroad.
