6-1/2SD6523 PDC Bit High-Efficiency Drilling Case in Taiyuan Formation
The Taiyuan Formation is characterized by interbedded sandstone, mudstone and carbonate rocks, with strong heterogeneity, high abrasiveness and poor drillability, which often leads to rapid bit wear, low drilling efficiency and borehole instability challenges. In this operation, our 6-1/2SD6523 PDC bit, customized for the lithological characteristics of the Taiyuan Formation, achieved outstanding performance in the designated interval, providing a reliable solution for efficient drilling in this complex formation.
1. Core Drilling Data
The 6-1/2SD6523 bit completed the drilling task without any downhole failures, with key operational metrics as follows:
Bit Model: 6-1/2SD6523
Bit Serial No.: 2719
Drilling Interval: 2638m ~ 3358m
Rig Team: 40607
Well No.: Su 25-2-16SX
Target Formation: Taiyuan Formation
Total Footage: 720m
Cumulative Pure Drilling Time: 42h
Average Rate of Penetration (ROP): 17.14m/h
2. Bit Design Advantages for Taiyuan Formation
To address the drilling challenges of the Taiyuan Formation, the 6-1/2SD6523 PDC bit incorporates targeted optimizations:
Cutting Structure Optimization: Adopts a mixed layout of high-impact resistance PDC cutters, balancing aggressiveness and abrasion resistance to handle interbedded hard and soft layers effectively.
Gauge Protection Enhancement: Features a full-diamond gauge structure to maintain bit dimensional stability during long-interval drilling, preventing borehole enlargement and reducing wellbore collapse risks.
Hydraulic System Optimization: Optimized nozzle placement and flow path design improve cuttings transport efficiency, avoiding bit balling in mudstone intervals and ensuring continuous drilling operations.
Crown Profile Design: A specially engineered crown profile enhances bottomhole coverage and stress distribution, improving overall drilling stability and longevity.
3. Field Application Performance
The 6-1/2SD6523 bit demonstrated exceptional performance in the 2638m-3358m interval of the Taiyuan Formation:
High Single-Bit Footage: Achieved 720m of total footage in a single run, eliminating the need for mid-operation bit trips and significantly reducing non-productive time.
Superior ROP: Delivered an average ROP of 17.14m/h, outperforming conventional bits in the same block and formation, effectively breaking through the speed bottleneck of Taiyuan Formation drilling.
Stable Downhole Operation: Operated smoothly throughout the drilling process with no incidents of cutter loss, bit balling or wellbore instability, ensuring high-quality wellbore conditions for subsequent cementing and completion operations.
4. Case Summary
The successful application of the 6-1/2SD6523 PDC bit in the Su 25-2-16SX well validates its excellent adaptability and reliability in the complex Taiyuan Formation. Through targeted design optimizations, the bit effectively mitigates the key challenges of high abrasiveness, poor drillability and low efficiency, achieving a balanced improvement in both ROP and total footage.
This case provides valuable field data and a proven drilling solution for operators targeting the Taiyuan Formation in the same block. Moving forward, we will continue to refine our bit designs based on real-world operational feedback, delivering more efficient and reliable drilling tools to support the industry's goals of cost reduction and performance enhancement.
