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The Combined PDC Bit is a high-performance drilling tool designed for multi-stage cutting and maximum efficiency in complex formations. Its unique dual-structure design integrates an aggressive stepped cutting face with a robust base, allowing it to perform both initial penetration and hole enlargement simultaneously. This bit is the premier choice for Horizontal Directional Drilling (HDD), foundation piling, and deep-well exploration where stability and speed are critical.
Key Features
Multi-Stage Cutting Structure: The tiered tower design allows for progressive formation engagement, significantly reducing vibration and ensuring a straighter borehole.
Integrated Hybrid Design: Combines the fast penetration of a drag bit with the stability of a step bit, making it highly versatile for varying strata.
Reinforced PDC Cutters: Equipped with premium, impact-resistant PDC inserts strategically placed to handle high torque and abrasive wear.
Superior Debris Removal: Engineered with large hydraulic flow channels to prevent bit balling and ensure rapid cuttings evacuation during high-volume drilling.
High-Strength Steel Body: CNC-machined from top-grade alloy steel and heat-treated for maximum durability in high-stress environments.
| Feature | Specification |
| Bit Type | Hybrid / Combined Step Type PDC Bit |
| Body Material | High-Grade Forged Alloy Steel |
| Cutting Structure | Multi-Tiered PDC Step Design |
| Application | HDD Reaming, Large Diameter Water Wells, Piling |
| Formation Range | Soft to Medium-Hard (Clay, Sandstone, Shale) |
| Thread Connection | API Standard / Custom Support |
Combined Cutting: The multi-stage tiered structure enables more efficient formation penetration and hole calibration.
Enhanced Stability: Its elongated body provides excellent centering performance, effectively preventing deviation in deep-hole projects.
Long-Life Engineering: Reinforced cutter density at critical points significantly extends service life in demanding operational conditions.
Grade | Protodyakonov Coefficient (f) | Representative Formations/Rocks | Recommended Drill Bits |
Grade 1 (Loose Soil) | 0.3~1.0 | Secondary loess, secondary red rock, soft sand without gravel/breccia, diatomite | PDC drag bit、 PDC reaming bit、 PDC combined guide bit |
Grade 2 (Loose Rock) | 1~2 | Yellow rock, red soil, peaty clay, sand soil, kaolin-type formations | PDC drag bit、 PDC reaming bit、 PDC combined guide bit |
Grade 3 (Lightly Soft Rock) | 2~4 | Strongly weathered shale/slate/grazing rock/schist/micro-cemented sand layer | PDC drag bit、 PDC reaming bit、 PDC combined guide bit |
Grade 4 (Slightly Soft Rock) | 4~6 | Shale, sandy shale, oil shale, carbonaceous shale, calcareous shale, sandy shale interlayer, argillaceous limestone | PDC drag bit、 PDC concave drill bit、PDC arc angle drill bit、PDC reaming bit、 PDC combined guide bit |
Grade 5 (Slightly Hard Rock) | 6~8 | Gravel layer, crushed stone layer, collapsed argillaceous slate, sericite-chlorite greenstone slate, schist, limestone, marble | PDC drag bit、 PDC concave drill bit、PDC arc angle drill bit、PDC reaming bit、 PDC combined guide bit |
Grades 6–7 (Medium-Hard Rock) | 8~12 | Chlorite, mica, slate, dry wood rock, schist, silicified limestone, calcite | PDC concave drill bit、PDC arc angle drill bit、PDC reaming bit、 PDC combined guide bit |
Grades 8–9 (Hard Rock) | 12~16 | Silicified mica rock, gneiss, basalt, diorite, pyroxenite, quartz Anshan porphyry | PDC concave drill bit、PDC arc angle drill bit、PDC reaming bit、 PDC combined guide bit、Tricone Drill Bit |
Grades 10–11 (Extremely Hard Rock) | 16~18 | Granite, granodiorite, gneiss, rhyolite, quartzite | PDC concave drill bit、PDC arc angle drill bit、PDC reaming bit、 Flat Matrix、 Tricone Drill Bit |
Grade 12 (Extremely Hard Rock) | 18~20+ | Quartzite, jasper, hornfels, corundum rock, quartz, flint, jasper | PDC reaming bit、 Flat Matrix、 Tricone Drill Bit |
