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The 4-Wing Concave PDC Bit is a high-stability drilling tool engineered for medium-hard formations. By combining an aggressive four-blade cutting structure with a self-centering concave profile, this bit ensures rapid penetration while maintaining exceptional borehole straightness. It is specifically designed for demanding applications such as coal mine gas drainage, water exploration, and geological survey projects where stability is paramount.
Key Features
Superior Stability (4-Wing Design): The four-blade geometry offers increased surface contact compared to 3-wing bits, significantly reducing vibration and improving hole quality.
Self-Centering Concave Profile: The internal V-shape design guides the bit along the intended path, effectively preventing borehole deviation in heterogeneous strata.
Premium PDC Cutting Structure: Outfitted with high-performance PDC cutters that deliver excellent wear resistance and impact toughness for extended service life.
Enhanced Hydraulic Efficiency: Features large junk slots and precision-placed water holes to ensure rapid cuttings evacuation and prevent bit balling in sticky formations.
Durable Steel Body: Precision-machined from high-grade alloy steel with an anti-corrosion gold coating for maximum structural integrity.
| Feature | Specification |
| Bit Type | 4-Wing Concave PDC Bit |
| Body Material | High-Strength Alloy Steel |
| Formation Range | Soft to Medium-Hard (Sandstone, Limestone, Shale) |
| Cutter Technology | Impact-Resistant Premium PDC |
| Connection | API Standard / Custom Threading |
| Application | Mining, Degassing, Water Well, Exploration |
Which Concave Bit is Right for You?
Choose our 3-Wing Concave Bit if your priority is maximum penetration speed in consistent soft formations like soft shale or mudstone. It offers the best hydraulic clearance to prevent bit balling.
Choose our 4-Wing Concave Bit if you require higher stability and borehole precision, especially in medium-hard formations or interbedded strata. Its 4-blade design provides a smoother drilling experience and a longer service life for deep-hole projects.
| Comparison Criteria | 3-Wing Concave Bit | 4-Wing Concave Bit | Selection Advice |
Stability | Good | Superior | More blades mean more stable contact with the hole wall; the 4-wing design minimizes vibration more effectively. |
ROP |
Aggressive |
Fast & Robust | The 3-wing bit has a smaller cutting surface and stronger aggressiveness, making it ideal for formations where ultimate speed is the priority. |
Flushing | Extremely Large | Large | The 3-wing bit offers greater clearance, making it less prone to balling in highly sticky clay formations. |
Durability | Average | Extended | The 4-wing design distributes the load across more cutters, reducing individual wear and resulting in a longer overall service life. |
Suitable Hole Depth | Shallow/ Conventional Drilling | Deep / Precision Drilling | The 4-wing bit demonstrates superior straightness and is better suited for maintaining trajectory in deep holes. |
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 |
