6-1/2SD6522 PDC Bit Delivers High-Efficiency Drilling Performance in Shiqianfeng Formation
The Shiqianfeng Formation is characterized by interbedded sandstone and mudstone, with strong rock abrasiveness and poor drillability. Drilling in this formation is frequently plagued by challenges such as borehole wall instability and rapid bit wear, which have long been the core pain points restricting the improvement of drilling speed and efficiency in the area. In this construction project, our 6-1/2SD6522 PDC bit, precisely engineered for the geological properties of the Shiqianfeng Formation, demonstrated outstanding rock-breaking capability and operational stability in the designated interval. With exceptional performance across all key drilling metrics, it provides a highly efficient drilling tool solution for operations in this formation.
1. Core Drilling Data
The 6-1/2SD6522 bit completed the drilling operation in the Shiqianfeng Formation without any faults, with the key construction indicators as follows:
- Bit Model: 6-1/2SD6522
- Drilling Interval: 690m ~ 2638m
- Target Formation: Shiqianfeng Formation
- Total ROP: 1948m
- Cumulative Drilling Time: 62h
- Average Penetration Rate: 31.42m/h
2. Customized Bit Design
Targeting the drilling challenges of the Shiqianfeng Formation, the 6-1/2SD6522 bit features exclusive structural and performance optimizations for high compatibility with the formation:
- Optimized cutting tooth layout and density balance rock-breaking aggressiveness and abrasion resistance, effectively adapting to the complex lithology of interbedded sandstone and mudstone and reducing tooth wear.
- A reinforced gauge protection structure enhances the bit's dimensional stability during long-interval drilling, preventing borehole enlargement, reducing the risk of borehole wall collapse, and ensuring high borehole quality.
- Rational design of hydraulic flow channels and nozzle positions improves the cuttings carrying efficiency of drilling fluid, avoids bit balling, and guarantees the continuity and stability of the drilling process.
3. Field Application Effect
The application of the 6-1/2SD6522 bit in the 690m-2638m interval of the Shiqianfeng Formation has broken the efficiency bottleneck of conventional drilling in this formation, achieving the construction results of long footage, high drilling speed and stable operation:
- A single bit achieved a total footage of 1948m without the need for tripping to replace drilling tools midway, significantly reducing non-drilling time and improving overall drilling construction efficiency.
- The average penetration rate reached 31.42m/h, far exceeding the operational indicators of conventional bits in the same formation and block, successfully breaking through the bottleneck of drilling speed improvement in the Shiqianfeng Formation.
- The bit operated stably throughout the drilling process without complex downhole issues such as tooth loss, bit balling or borehole wall instability. The high reliability of the drilling tool lays a solid foundation for subsequent processes such as cementing.
4. Case Summary
The successful application of the 6-1/2SD6522 PDC bit in the 690m-2638m interval of the Shiqianfeng Formation fully verifies its adaptability and reliability in the complex Shiqianfeng Formation. Relying on targeted structural optimization design, the bit effectively solves the industry problems of strong abrasiveness, poor drillability and low drilling efficiency in the Shiqianfeng Formation, achieving a dual breakthrough in drilling footage and penetration rate.
The field application data accumulated from this project provides valuable practical references and an efficient drilling tool selection scheme for drilling operations in the same block and similar Shiqianfeng Formations. Going forward, we will continue to leverage feedback from field construction to continuously optimize bit design and R&D, providing higher-quality and more adaptive products and technical support for drilling operations in various complex formations, and helping the drilling industry reduce costs and consumption while improving speed and efficiency.
