The concave, three-blade PDC bit is designed for full-face drilling without core recovery. It uses polycrystalline diamond compact (PDC) cutters. Its concave profile helps keep the bit centered and reduces the risk of deviation while drilling.
Features
Polycrystalline diamond compact (PDC) cutters: The bit uses high-quality diamond composite cutters with high hardness and wear resistance. They cut through rock, deliver a high rate of penetration, and have a longer service life than tungsten-carbide bits.
High-strength body: The bit body is forged from alloy steel. It offers good toughness and impact resistance and is resistant to blade chipping and breakage, making it suitable for challenging geological conditions in underground workings.
Three blades with flushing channels: The channels circulate water or drilling fluid and efficiently remove cuttings. Central and side flushing nozzles direct fluid to the cutters, helping cool the bit and clear cuttings from the bottom of the hole. Drilling must be carried out with a continuous supply of water or drilling fluid.
Standard threaded connection: The shank has a standard thread compatible with conventional geological drill rods. The bit is easy to install and remove and is suitable for use with a range of drilling rigs.
Applications
Exploratory drilling and aquifer detection in coal mines
Gas drainage borehole drilling
Drilling holes for grout injection and rock reinforcement
Geological exploration and engineering site investigations
Shallow water-well drilling
Suitable formations and ground
Suitable for drilling in soft to medium-hard rock, clay, sandy ground, weathered rock, and coal seams.
Operating recommendations
Before drilling, inspect the threaded connection and secure the bit firmly.
Start with moderate weight on bit and low rotational speed. Increase operating parameters gradually once the bit is stable.
If the bit encounters a hard layer or becomes stuck, reduce the load and carefully work the drill string. Do not try to overcome resistance by applying excessive pressure.
Maintain a continuous supply of water or drilling fluid.
Dry drilling is prohibited: overheating may damage the PDC cutters.
Specification：
Parameter | Specification |
Product name | Concave three-blade drill bit |
Cutting elements / blades | Polycrystalline diamond compact (PDC) cutters / 3 blades |
Core sampling method | Non-coring (full-face drilling) |
Cuttings removal | Flushing through central and side ports |
Standard sizes | Φ75 / Φ94 / Φ113 / Φ133 mm (custom sizes available on request) |
Applicable formations | Soft to medium-hard rock, clay, sandy soil, weathered rock, and coal seams |
Main applications | Exploration of aquifers in coal mines, gas drainage, grout injection for rock reinforcement, geological exploration, and shallow water-well drilling |
Operating requirements | Drilling must be performed with a water supply; dry drilling is strictly prohibited |
Product name | Model | Thread | Bit type | Applicable formations | Number of PDC cutters | Weight, kg |
Spiral three-blade concave bit | 94 mm | Standard: 42, 50, 76/60, 63.5, 73 mm; other diameters available with an adapter | Standard-type PDC bit; flat and spherical cutters, type 1308 | Medium-hard rock, F ≤ 6 | 6 × 1308; 2 × 1305 | 2.4 |
Spiral three-blade concave bit | 98 mm | Standard: 42, 50, 76/60, 63.5, 73 mm; other diameters available with an adapter | Standard- and reinforced-type PDC bit; flat and spherical cutters, type 1308 | Medium-hard rock, F ≤ 6; harder rock, F ≤ 8 | 6 × 1308; 2 × 1305 | 3 |
Spiral three-blade concave bit | 113 mm | Standard: 42, 50, 76/60, 63.5, 73 mm; other diameters available with an adapter | Standard- and reinforced-type PDC bit; flat and spherical cutters, type 1308 | Harder rock, F ≤ 8 | 9 × 1308; 2 × 1305 | 3.7 |
Custom manufacturing and machining are available upon request.
