Case Study: Efficient Drilling Practice of Well Su 76-5-31SX in Shihezi Formation
Partner Client: Drilling Company No.1 of Changqing Oilfield
Service Provider: Shaanxi Hainaisen Petroleum Technology Co., Ltd.
Project Location: Sulige Gas Field, Ordos Basin
Application Interval: 4100m - 4600m of Well Su 76-5-31SX, Shihezi Formation
Product Applied: Model 6SD6526 PDC Bit (Serial No. A300)
1. Project Background
The Shihezi Formation of Sulige Gas Field is dominated by quartz sandstone and debris sandstone, featuring strong abrasiveness and poor drillability, which is a core bottleneck for drilling speed enhancement in the region. Conventional PDC bits in this well area often suffer from low mechanical drilling rate, insufficient single-bit footage, and frequent tripping operations, directly increasing drilling cycle and operation costs. During the construction of Well Su 76-5-31SX, Drilling Team 40695 urgently needed a bit product adaptable to highly abrasive formations and capable of efficient drilling to break through the drilling bottleneck of the Shihezi Formation.
Our technical team, combined with the actual drilling data of the well section drilled in Well Su 76-5-31SX and the formation characteristics of Sulige Gas Field, customized a solution for the client using the Model 6SD6526 PDC bit.
2. Solution
- High-Wear-Resistant PDC Cutters: Adopted high-wear-resistant polycrystalline diamond compact (PDC) cutters, optimized cutter arrangement and impact-resistant structure to adapt to highly abrasive sandstone formations.
- Optimized Hydraulic Structure: Improved the bottomhole flow channel cleaning capability to reduce repeated cutting of cuttings and bit wear.
- Drilling Parameter Guidance: Provided targeted drilling parameter optimization suggestions to maximize the performance of the bit.
3. On-site Application Effects
Core Drilling Data
| Item | Index |
|---|---|
| Bit Specification No. | 6SD6526 |
| Bit Serial No. | A300 |
| Application Interval | 4100m - 4600m |
| Drilling Crew | 40695 Drilling Team |
| Well No. | Su 76-5-31SX |
| Formation Penetrated | Shihezi Formation |
| Single Bit Footage | 500m |
| Net Drilling Time | 81h |
| Average Mechanical Drilling Rate | 6.17m/h |
On-site Application Highlights
- Reduced Tripping Frequency with Qualified Single Bit Footage: In the highly abrasive Shihezi Formation, a single bit completed 500m drilling without mid-run tripping for replacement, reducing tripping operations by 2 times and saving a lot of auxiliary operation time.
- Significantly Improved Mechanical Drilling Rate, Shortened Drilling Cycle: The average mechanical drilling rate reached 6.17m/h, an increase of over 50% compared with the average drilling rate (3.5-4m/h) of conventional bits in the same formation of the well area. It only took 81 hours to complete 500m formation drilling, providing key support for shortening the full-well drilling cycle.
- Controllable Bit Wear, Stable Service Life: After tripping out, the bit was in good wear condition with uniform cutter wear, no chipping or tooth breakage, verifying the product's reliability and durability in highly abrasive formations.
4. Client's Real Feedback
"Our Drilling Team 40695 has constructed wells in the Shihezi Formation of Sulige Gas Field for years, and has long been troubled by the problems of strong formation abrasiveness, slow drilling speed and short bit service life. With the Model 6SD6526 PDC bit from Hainaisen for the 4100-4600m interval of Well Su 76-5-31SX, a single bit drilled 500 meters, and the average drilling rate hit 6.17m/h—more efficient than the imported bits we used before. The net drilling time was directly reduced by more than half.
Most importantly, the bit was in good condition after tripping out, with no premature scrapping, which saved us time for tripping and bit procurement costs. Hainaisen's technical team was professional from selection to on-site parameter guidance, fully meeting our formation needs. We will fully promote this bit in other wells of Sulige Gas Field in the future, and continue to cooperate deeply with Hainaisen to solve more difficulties in drilling speed enhancement."—— On-site Supervisor of Drilling Team 40695, Changqing Oilfield
5. Service Summary
Shaanxi Hainaisen Petroleum Technology Co., Ltd. has always focused on the demand for drilling speed enhancement in oil and gas fields. With independently developed PDC bit products and customized technical services, we help customers solve drilling difficulties in complex formations. The successful application of Well Su 76-5-31SX once again verifies the excellent performance of our 6SD series PDC bits in highly abrasive sandstone formations, and provides a replicable practical solution for efficient drilling in the Shihezi Formation of Sulige Gas Field.
In the future, we will continue to deepen the R&D of PDC bit technology, optimize product design according to the characteristics of different blocks and formations, and provide more efficient, economical and reliable drilling tools and technical services for global oil and gas field customers, contributing to cost reduction and efficiency improvement in oil and gas field development.
Official Website: https://www.hnsdrillbit.com
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