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The Double Tower (Dual Tier) PDC Bit features an advanced multi-stepped cutting structure designed for demanding drilling environments. By incorporating two distinct tiers of cutters, this bit provides superior stability and aggressive penetration in medium-hard formations. It is specifically engineered to handle transition layers where stability and borehole precision are critical.
Key Features
Dual-Tier Cutting Structure: The double-tower design distributes the cutting load more evenly across multiple levels, reducing individual cutter wear and extending bit life.
Superior Borehole Quality: The multi-stage stepping action acts as a natural stabilizer, ensuring exceptionally straight holes and minimizing spiraling in deep wells.
Enhanced Impact Resistance: Strategically placed premium PDC cutters are optimized to withstand the impact of interbedded formations (such as alternating layers of sand and shale).
Maximum Hydraulic Efficiency: Large center flow ports and deep junk slots ensure immediate cooling of the cutting face and rapid evacuation of debris.
Heavy-Duty Alloy Steel Body: Precision-forged steel body with a protective anti-corrosion finish for maximum structural integrity under high torque.
| Feature | Specification |
| Bit Type | Double Tower / Dual Tier Step PDC Bit |
| Blade Design | Multi-stepped Dual Tier |
| Body Material | High-Grade Alloy Steel |
| Cutter Size | Available in 1308 / 1606 / 1913 |
| Applicable Formation | Medium to Medium-Hard (Shale, Limestone, Sandstone) |
| Cutter Technology | Impact-Resistant Premium PDC |
| Connection Thread | API Regular / IF / Custom Threading |
Applications
Deep Water Well Drilling: Ideal for deep wells where maintaining verticality is a challenge.
Mining & Degassing: Perfect for gas drainage and water injection holes in coal mines.
Geological Core Pilot Holes: Provides a stable start for complex exploration projects.
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 |
