alloy-steel-PDC-three-wing-concave-coreless-drill-bits,Suitable-for-grouting-holes-in-water-wells,-geothermal-exploration,-coal-mines
alloy-steel-PDC-three-wing-concave-coreless-drill-bits,Suitable-for-grouting-holes-in-water-wells,-geothermal-exploration,-coal-mines
alloy-steel-PDC-three-wing-concave-coreless-drill-bits,Suitable-for-grouting-holes-in-water-wells,-geothermal-exploration,-coal-mines
alloy-steel-PDC-three-wing-concave-coreless-drill-bits,Suitable-for-grouting-holes-in-water-wells,-geothermal-exploration,-coal-mines
alloy-steel-PDC-three-wing-concave-coreless-drill-bits,Suitable-for-grouting-holes-in-water-wells,-geothermal-exploration,-coal-mines
alloy-steel-PDC-three-wing-concave-coreless-drill-bits,Suitable-for-grouting-holes-in-water-wells,-geothermal-exploration,-coal-mines
alloy-steel-PDC-three-wing-concave-coreless-drill-bits,Suitable-for-grouting-holes-in-water-wells,-geothermal-exploration,-coal-mines

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.
Mobel Number: 65# Regular

Our Craftsmanship

Integrated forming of tungsten carbide alloy steel
PDC vacuum welding boosts strength, durability,performance
Diverse product line suitable for various fields.
Applications of drill bits in various rock layers and scenarios READ NOW
Model **
Brand FENGSU
Type Drill bit
Material Aolly
Size Range **
Thread Type **
Recommended Formation **
Origin HUNAN,China
Packaging Carton or Wooden Box

Title

We are based in Hunan, China, start from 2019,sell to South Asia(16.00%),Mid East(15.00%),Africa(13.00%),Southeast Asia(12.00%),Eastern Asia(10.00%),North America(8.00%),Central America(6.00%),South America(6.00%),Northern Europe(4.00%),Western Europe(3.00%),Domestic Market(3.00%),Oceania(2.00%),Southern Europe(1.00%),Eastern Europe(1.00%). There are total about 51-100 people in our office.

We are based in Hunan, China, start from 2019,sell to South Asia(16.00%),Mid East(15.00%),Africa(13.00%),Southeast Asia(12.00%),Eastern Asia(10.00%),North America(8.00%),Central America(6.00%),South America(6.00%),Northern Europe(4.00%),Western Europe(3.00%),Domestic Market(3.00%),Oceania(2.00%),Southern Europe(1.00%),Eastern Europe(1.00%). There are total about 51-100 people in our office.

Sub Title

We are based in Hunan, China, start from 2019,sell to South Asia(16.00%),Mid East(15.00%),Africa(13.00%),Southeast Asia(12.00%),Eastern Asia(10.00%),North America(8.00%),Central America(6.00%),South America(6.00%),Northern Europe(4.00%),Western Europe(3.00%),Domestic Market(3.00%),Oceania(2.00%),Southern Europe(1.00%),Eastern Europe(1.00%). There are total about 51-100 people in our office.We are based in Hunan, China, start from 2019,sell to South Asia(16.00%),Mid East(15.00%),Africa(13.00%),Southeast Asia(12.00%),Eastern Asia(10.00%),North America(8.00%),Central America(6.00%),South America(6.00%),Northern Europe(4.00%),Western Europe(3.00%),Domestic Market(3.00%),Oceania(2.00%),Southern Europe(1.00%),Eastern Europe(1.00%). There are total about 51-100 people in our office.

We are based in Hunan, China, start from 2019,sell to South Asia(16.00%),Mid East(15.00%),Africa(13.00%),Southeast Asia(12.00%),Eastern Asia(10.00%),North America(8.00%),Central America(6.00%),South America(6.00%),Northern Europe(4.00%),Western Europe(3.00%),Domestic Market(3.00%),Oceania(2.00%),Southern Europe(1.00%),Eastern Europe(1.00%). There are total about 51-100 people in our office.

Best Practices for Using Composite Sheet Drill Bits

1. During normal operations, it is strictly forbidden to suddenly reverse the direction of operation to prevent the detachment of the composite sheet drill bits.
2. Ensure that there are no air leaks in the main airway of the air compressor during normal operations to maintain sufficient airflow and pressure, thereby extending the life of the diamond composite sheet drill bits.
3. When using a new composite sheet drill bit for the first time, operate at low speed for half an hour for running-in before progressively transitioning to normal usage.
4. In adverse geological conditions, reduce the axial pressure and rotation speed to prevent drill bit fracture.
5. During normal drilling operations, if it becomes necessary to change the drill bit midway, thoroughly check the borehole for debris. Only proceed with a new composite sheet drill bit if the borehole is clean.
6. To ensure stable and normal operation of the drill bit, replace the stabilizer regularly.
Pay attention to the cleanliness of the drilling area when using a new composite sheet drill bit for the first time to prevent debris from affecting
7. normal operation. Before replacing with a new drill bit, carefully check that the threads and teeth are intact and gently push to test if there are any issues.
8. Ensure that the inside is dust-free and the air outlet is clear, the threads are lubricated, and after connecting the drill bit with lifting and rotation, you may proceed to use it.
9. It is strictly prohibited to use bent drill rods to avoid uneven stress on the drill bit, which could accelerate damage and affect the normal usage time.
10. Choose different drill bits and operation methods based on different situations.
11. Before descending the well with a composite sheet drill bit, carefully inspect all parts to ensure there are no issues before beginning to use the drill bit.

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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