Four-Wing Concave PDC Drag Bit: High Stability for Soft Formations
Engineered for soft to medium formations (F<8) — anchoring, grouting, water wells, and geothermal.
Need a PDC bit that stays straight in soft rock? The four-wing concave PDC drag bit is built for soft to medium formations (F<8). Its concave design improves center cutting and stability. As a result, you get less deviation, smoother holes, and fewer bit changes. Therefore, this bit lowers your total drilling cost. It works for anchoring, grouting, water wells, and shallow geothermal.
⚠️ Why Regular Bits Fail in Soft Formations
Contractors face many problems. Holes go crooked. Penetration is slow. Blades break. Bits get stuck. However, soft rock does not need super-hard bits. It needs balanced cutting and steady control. That is where the concave four-wing design makes a difference.
🔧 How the Concave Design Solves Problems
Cross blades: Blades are in a cross pattern. Therefore, deviation drops. Ideal for anchor holes where precision matters.
Stronger center cutting: Concave shape makes center cutters hit rock first. Consequently, penetration speeds up. Drilling stays smooth.
Better impact resistance: Load spreads across all four blades. So, the bit handles thin hard layers without breaking.
Fast cuttings removal: Large slots help fluid move cuttings out. As a result, bit balling stops.
✅ Key Advantages
📍 Where to Use This Bit
⛰️ Best Formations
Soft to medium (F<8): Sandstone, mudstone, shale, limestone, marble. ⚠️ Not for granite, basalt, or highly abrasive rock.
📏 Available Sizes (mm)
75 / 91 / 113 / 133 / 153 / 171 / 200 / 220 / 245 / 275 / 300 / 325
Custom diameters available.
⚙️ Custom Engineering Service
We customize: cutter density, concave depth, blade geometry, custom threads, formation-specific designs.
Simply share your formation details. Our engineers will design the optimal bit.
📋 Field Case: Slope Stabilization
Sichuan highway slope needed 20m anchor holes in mixed sandstone/mudstone. Regular bits deviated. Blades broke.
115mm four-wing concave PDC bit. Hole deviation <0.5°. ROP 2.1x faster. One bit drilled 18 holes.
📋 Quick Checklist
🚀 Conclusion
The four-wing concave PDC drag bit balances stability, durability, and speed. It is built for soft to medium formations. Therefore, it lowers your cost per meter and reduces downtime.
Contact our team for a custom design based on your formation data.
Summary: Four-wing concave PDC drag bit for soft to medium formations (F<8). Cross-symmetric concave design improves stability and hole quality. Ideal for anchoring, water wells, and geothermal.
Need a custom solution? Contact our engineering team with your formation samples.