Professional Design Down The Hole Hammer Sizes - Drilling Drag Bit – TDS
Professional Design Down The Hole Hammer Sizes - Drilling Drag Bit – TDS Detail:
3 wings step drag bits are one piece construction of alloy steel cast with tungsten carbide cutting tips and gauge sides to ensure longer life. It has 3 wings and 3 flushing holes. Compared with 4 wings, 3 wings step drag bits tend to drill faster and aggressive, whereas, are shorter lasting and less durable.3 wings step style drag bits will produce larger cuttings force than chevron style drag bit. Rotary table speed of step drag bits should be between 60 and 80 rpm with light weight on bit (WOB).
3 wings step drag bits are economical tools when drilling softer geological formations and shallower depths, they are primarilydesigned for soft tomedium formations, such as Clay, Loam, Silt ,Mostsoft-to-medium soilsthat have some moisture, etc. And also step drag bits are recommended for drilling in Mining, Exploration, Environmental, Water well, Geo Exchange, etc.
| Drag bits | ||
| Type | Suitable formation | Diamter |
| 2 wings air flush step drag bit | Medium to Soft | 95.3mm(3 3/4 inch) |
| 3 wings air flush step drag bit | Medium to Soft | 95.3mm(3 3/4 inch) |
| 3 wings air flush chevron drag bit | Medium to hard | 95.3mm(3 3/4 inch) |
| 3 wings full flush step drag bit | Medium to Soft | 95.3mm(3 3/4 inch) |
| 3 wings step drag bit | Medium to hard | 50.8 to 444.5mm2 to 17 1/2 inch) |
| 3 wings chevron drag bit | Medium to hard | 63.5 to 304.8mm(2 1/2 to 12 inch) |
| 4 wings step drag bit | Medium to Soft | 165.1 to 444.5mm(6 1/2 to 17 1/2 inch) |
| 4 wings chevron drag bit | Medium to hard | 165.1 to 304.8mm(6 1/2 to 12 inch) |
| Claw bit | Fast penetration | |
| Thread size: 2 3/8” API Reg, 2 7/8” API Reg, 3 1/2” API Reg, 4 1/2” API Reg, 6 5/8” API Reg,
2” API IF, 2 3/8” API IF, 2 7/8” API IF, A Rod, N Rod, AW, BW, NW, AWJ, BWJ, NWJ. |
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