alloy steel PDC three-wing concave coreless drill bits,Suitable for grouting holes in water wells, geothermal exploration, coal mines
The concave straight-line drill bit is engineered for fast, obstruction-free drilling, enhanced durability, and accurate straight drilling without deviations.
Our Craftsmanship
| Model | ** |
|---|---|
| Brand | FENGSU |
| Type | Drill bit |
| Material | Aolly |
| Size Range | ** |
| Thread Type | ** |
| Recommended Formation | ** |
| Origin | HUNAN，China |
| Packaging | Carton or Wooden Box |
Comprehensive Rock Drilling Reference Table
| Stratum Classification/Name | Representing Rock Strata | Theoretical Drilling Speed/Recommended Pull-out Length | Recommended Drill Bits |
|---|---|---|---|
| Level 1 (Loose Soil) | Secondary loess, secondary Hongshi, soft sand without gravel and angular gravel, diatomaceous earth | 15M/h, 15M/P | Alloy drill bit, small-tooth composite drill bit, ordinary composite drill bit |
| Level 2 (Loose Rock) | Huangshi/Hongshi/Peaty Clay/Sandy Soil/Kaolin Type | 8M/h, 2.4M/P | Alloy drill bit, small-tooth composite drill bit, ordinary composite drill bit |
| Level 3 (Soft Rock) | Strongly Weathered Shale/Slate/Grazing Rock/Schist/Slightly Cemented Sand Layer | 6M/h, 2M/P | Ordinary composite drill bit, triangle composite drill bit, bread-shaped composite drill bit, blade-shaped composite drill bit |
| Level 4 (Slightly Soft Rock) | Shale, sandy shale, oil shale, carbonaceous shale, calcareous shale, sand shale interlayer, argillaceous limestone | 5M/h, 1.7M/P | Ordinary composite drill bit, triangle composite drill bit, bread-shaped composite drill bit, blade-shaped composite drill bit |
| Level 5 (Slightly Hard Rock) | Gravel and gravel layers, collapse layer muddy slate, sericite chlorite greenstone slate, schist, limestone, marble | 3M/h, 11.50M/P | Ordinary composite drill bit, triangle composite drill bit, bread-shaped composite drill bit, blade-shaped composite drill bit |
| Level 6-7 (Medium Hard Rock) | Chlorite, mica, slate, Qianmu rock, schist, silicified limestone, calcite | 2M/h, 1.3M/P-1.1M/P | Blade-shaped composite drill bit, reinforced composite drill bit, helmet-tooth composite drill bit, high-grade electroplated diamond drill bit |
| Level 8-9 (Hard Rock) | Silicified mica rock, gneiss, basalt, diorite, pyroxenite, quartz Anshan porphyry | 1.2M/h, 0.3M/P-0.65M/P | Thickened composite drill bit, blade-shaped composite drill bit, helmet-tooth composite drill bit, conventional electroplated diamond drill bit, thermally stable polycrystalline diamond (TSP) drill bit |
| Level 10-11 (Very Hard Rock) | Granite, granodiorite, gneiss, rhyolite, quartzite | 0.8M/h, 0.5M/P-0.32M/P | Body sintered drill bit, low-degree electroplated diamond drill bit, thermally stable polycrystalline diamond (TSP) drill bit. |
| Level 12 (Extremely Hard Rock) | Quartzite, jasper, angle shale, corundum rock, quartz, flint, jasper | 0.3M/h, 0.16M/P | Body sintered drill bit, low-degree electroplated diamond drill bit, thermally stable polycrystalline diamond (TSP) drill bit. |
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Hunan FengSu Drill Bit Co., Ltd. has 5 independent workshops and hundreds of employees. It has cooperated with China University of Geosciences and hired dozens of professors and doctors to research the ultra-wear-resistant material, with over 50 applications for patents. It's the manufacture of drill bit products which are efficient and strong enough to meet varied drilling requirements like natural gas, oil, coal exploration, geological exploration, and water wells. Certainly, our products will work perfectly under all kinds of rock environments. Adhering to the concept of unremitting technological innovation, strict quality control, and guaranteeing the reliability and professionalism in the products that we offer.
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