Hainaisen PDC Bit Field Application Case: High-Efficiency Drilling in Shiqianfeng Formation
Client: A Drilling Branch of PetroChina Changqing Oilfield Company
Well Site: Well 50503, Sulige Gas Field
Drilling Crew: Crew 3008
Product Applied: 8-1/2" SD9633 PDC Bit, Shaanxi Hainaisen Petroleum Technology Co., Ltd.
Project Background & Drilling Challenges
The Shiqianfeng Formation in the Sulige Gas Field is widely recognized as a tough drilling challenge in the region. This formation is dominated by medium-coarse grained sandstone and conglomeratic sandstone, characterized by high quartz content, extreme abrasiveness, and severe formation heterogeneity. Conventional bits typically suffer from short footage, low ROP (Rate of Penetration), and frequent tripping, which significantly prolongs drilling cycles and inflates operational costs.
For Well 50503, the target interval was 982m (exclusive to the Shiqianfeng Formation). The client’s core requirements were clear: maximize single-bit footage, improve ROP, reduce tripping frequency, and cut overall drilling costs while ensuring wellbore stability.
Hainaisen Bit Selection & Technical Adaptation
Tailored to the properties of the Shiqianfeng Formation, Hainaisen’s technical team recommended the 8-1/2" SD9633 PDC Bit for Crew 3008, with key design optimizations:
Blade Structure: 5-blade impact-resistant design with a high-strength alloy steel integral body, engineered to withstand fatigue in highly abrasive formations
Cutting Element Configuration: Hainaisen’s self-developed high-wear-resistance PDC cutters, with optimized cutter layout and exposure to balance aggressiveness and abrasion resistance
Hydraulic Structure: Custom deep watercourses and large-flow nozzles to enhance cuttings carrying capacity, prevent bit balling, and ensure stable drilling performance
Field Application Data & Performance
| Item | Core Parameter | Industry Average Level | Performance Improvement |
|---|---|---|---|
| Bit Model | 8-1/2" SD9633 | Conventional PDC bits of the same size | - |
| Bit Serial No. | 3340 | - | - |
| Drilling Interval | 982m (full Shiqianfeng Formation) | Average single-bit footage: 1200-1500m | Full coverage of target interval with zero mid-run tripping |
| Total Footage | 2026m | Average single-bit footage in the same formation: ~1600m | Footage increased by over 26% |
| Net Drilling Time | 73h | Average net drilling time in the same formation: ~95h | Drilling time reduced by 23% |
| Average ROP | 27.75m/h | Average ROP in the same formation: ~16.8m/h | ROP improved by over 65% |
| Formation | Shiqianfeng Formation, Su 75-48-22X Block | - | - |
Client’s On-Site Feedback (Captain Wang, Crew 3008)
“Drilling the Shiqianfeng Formation in Sulige has always been a headache for us. We’ve tried bits from multiple manufacturers before—either the ROP was painfully slow, or the footage was too short, requiring us to trip out and replace bits after just a few hundred meters. The time and cost wasted on tripping alone was unbearable. This time, using Hainaisen’s SD9633 bit really set a new benchmark for us.
From spudding to completing the interval, one single bit drilled through the entire 982m Shiqianfeng Formation, with a total footage of 2026m and a stable average ROP of 27.75m/h—even faster than the imported bits we used before. The entire drilling process was extremely smooth, with no bit bounce or balling issues. When we pulled the bit out, the wear was minimal, and it could easily be run back in for another interval.
This collaboration not only cut our drilling cycle by nearly 3 days but also reduced our per-well bit cost by over 30%. Hainaisen’s products are truly field-proven, and their technical support is top-notch—from bit selection to on-site follow-up, they’re with you every step of the way. From now on, for all our Shiqianfeng Formation projects, Crew 3008 will be sticking with Hainaisen bits.”
Hainaisen Technical Support
Pre-Project Formation Survey: Before the project, our technical team conducted on-site research on the lithology of the Shiqianfeng Formation and offset well data to optimize the bit structure accordingly
Full-Cycle On-Site Follow-Up: A dedicated technical engineer was stationed at the well site to monitor drilling parameters in real time and adjust the drilling plan dynamically based on downhole conditions
Post-Run Performance Evaluation: After bit retrieval, we completed a full wear analysis and data review to provide a basis for further bit optimization for future projects in the same block
Case Summary
The successful application of the 8-1/2" SD9633 PDC Bit in the Shiqianfeng Formation of the Sulige Gas Field fully validates Shaanxi Hainaisen Petroleum Technology Co., Ltd.’s technical strength in R&D of bits for highly abrasive formations.
Through customized product design and end-to-end technical services, Hainaisen helped the client achieve breakthroughs in both single-bit footage and ROP, while reducing drilling cycle and overall costs, delivering a reliable domestic bit solution for the efficient development of the Sulige Gas Field.
For more case studies of Hainaisen bits in different formations, please visit our official website: https://www.hnsdrillbit.com/ or contact our international sales team for a customized drilling solution.
