Case Study: 6-1/2" SD6431 PDC Bit Stable Completion Application in Taiyuan Formation Complex Interbed
Project Overview
The Taiyuan Formation is a typical complex lithology interval in the Ordos Basin oil and gas development block, characterized by interbedded sandstone, coal seams, limestone and mudstone. With frequent lithology changes, strong abrasiveness of hard interlayers, and high risk of stick-slip vibration and bit bouncing during drilling, conventional PDC bits commonly face pain points including unstable and low ROP, severe cutter impact damage, and short service life in this formation, failing to meet the demand of one-trip completion.
To address these technical challenges, Shaanxi Hainaisen Petroleum Technology Co., Ltd. developed the 6-1/2" SD6431 PDC bit with targeted customized design based on the lithological characteristics of the Taiyuan Formation. This product was successfully applied in Well Su 25-16-39X, smoothly completed the drilling task with outstanding performance, and achieved the expected goal of efficient and stable completion.
Core Drilling Performance Parameters
| Technical Indicator | Field Verified Data |
|---|---|
| Bit Model & Specification | 6-1/2" SD6431 |
| Unique Bit Serial Number | A2870 |
| Drilling Crew | 40607 |
| Well Number | Su 25-16-39X |
| Target Formation | Taiyuan Formation |
| Applied Drilling Interval | 2820m – 3431m |
| Total Single-Trip Footage | 611m |
| Net Drilling Time | 31 Hours |
| Average Mechanical ROP (Rate of Penetration) | 19.8 m/h |
| Reason for Tripping Out | Drilling Completion |
On-site Performance Highlights
- Smooth One-Trip Completion: The 6-1/2" SD6431 PDC bit completed 611m of full-interval drilling in a single trip in the complex interbedded Taiyuan Formation, and tripped out only after the completion of the drilling task. No abnormal tripping caused by bit failure occurred during the operation, fully verifying the product's high reliability.
- Stable & Efficient Drilling Performance: The bit achieved an average mechanical ROP of 19.8 m/h in the Taiyuan Formation with frequent lithology changes, maintained a stable penetration rate throughout the whole drilling process, effectively avoided common problems such as ROP drop and pressure holding in soft-hard interbedded formations, and shortened the operation cycle for the drilling crew.
- Excellent Anti-Impact & Wear Resistance: After 31 hours of continuous net drilling operation, the bit still maintained excellent working condition. No abnormal failures such as cutter chipping, excessive wear or matrix damage occurred, showing outstanding adaptability to the impact load caused by alternating hard and soft formations.
- Strong Adaptability to Complex Lithology: The customized design of the bit perfectly adapts to the composite lithology of sandstone, coal seam and limestone in the Taiyuan Formation, maintains stable rock-breaking efficiency under different formation conditions, and meets the technical requirements of continuous drilling in complex interbedded sections.
Core Advantages of SD6431 Series PDC Bit
- Interbedded Formation Targeted Design: The bit adopts a balanced cutter layout and optimized blade structure for the characteristics of the soft-hard interbedded Taiyuan Formation, which effectively reduces downhole stick-slip vibration, improves the operation stability of the bit, and avoids impact damage to cutters.
- High-Performance Composite Cutter: Equipped with premium grade impact-resistant and wear-resistant PDC cutters, which have excellent toughness to resist impact under alternating load conditions, and maintain long-term wear resistance in abrasive hard formations, ensuring the long service life of the bit.
- Optimized Hydraulic Cleaning System: The optimized hydraulic flow field design enhances bottom-hole cleaning and chip removal capacity, effectively prevents bit balling in coal and mudstone sections, reduces repeated cutting of rock cuttings, and maintains stable ROP during long-term operation.
- High-Strength Matrix Structure: The reinforced bit body design has excellent torsional strength and impact resistance, can adapt to the complex downhole dynamic environment of interbedded formations, ensures the safety of long-distance continuous drilling operations, and reduces the risk of downhole accidents.
About Us
Shaanxi Hainaisen Petroleum Technology Co., Ltd. is a professional manufacturer and service provider of high-performance PDC drill bits, focusing on providing customized, efficient and reliable drilling solutions for global oil and gas, mining, geothermal and other drilling fields. With advanced R&D technology, strict quality control system and rich on-site application experience, we are committed to helping customers improve drilling efficiency, reduce comprehensive operation costs, and create greater value for every drilling operation.
For more product details and application cases, please visit our official website: https://www.hnsdrillbit.com/
