Indroduction To Drilling Bit Jet Nozzles For The Hole Is Usually Small Aroud 0.25 Inch In Diameter
Indroduction to drilling bit jet nozzles for the hole is usually small aroud 0.25 inch in diameter
The part of the bit that includes a hole or opening for drilling fluid to exit.The hole is usually small (around 0.25 inch in diameter) and the pressure of the fluid inside the bit is usually high,leading to a high exit velocity through the nozzles that creates a high-velocity jet below the nozzles.This high-velocity jet of fluid cleans both the bit teeth and the bottom of the hole. The sizes of the nozzles are usually measured in 1/32-inch increments(although some are recorded in millimeters),are always reported in "thirty-seconds"of size(i.e.fractional denominators are not reduced),and usually range from 6/32 to 32/32.
Drilling fluids circulate through a drill string to nozzles at the bit and back to the surface via the system annulus.They provide three crucial functions to drilling:
- Cleaning of the cutting structure
- Cuttings removal from the hole bottom
- Efficient cuttings evacuation to the surface
| Common Alloy Grades, Ghysical Mechanical Properties And Recommended Application | |||||||
| Grade | WC% | Co/Ni % | Physical and mechanical properties | Grain size (μm) | Recommended application | ||
| Density (g/cm3) | TRS (N/mm2) | Hardness (HRA) | |||||
| ZG01 | 100 | 0 | 15.3-15.5 | 1200 | 95.5 | 0.3 | Ultra-high hardness, high wear resistance, anti-corrosion, with certain anti-destructive ability |
| ZG04X | 96 | 4 | 15.0-15.2 | 1600 | 92.8 | 0.8-1.0 | Suitable for drawing die, non-ferrous metal wire drawing and wear-resistant parts |
| ZG06 | 94 | 6 | 14.8-15.1 | 2500 | 90.0 | 1.2 | Good abrasion resistance, good compression resistance, suitable for wear-resistant parts that resist abrasion and high pressure. |
| ZG06X | 94 | 6 | 14.8-15.1 | 2400 | 91.5 | 1.0 | Superio wear resistance,good comprehensive properties,suitable for making non-standard structure components with higher wear resistance. |
| ZG06A | 94 | 6 | 14.8-15.1 | 2150 | 92.5 | 0.6-0.8 | |
| ZG08 | 92 | 8 | 14.6-14.9 | 2700 | 89.0 | 1.2-1.6 | Good general performance, used for general wear parts, molds, general tools, etc. |
| ZG10.2 | 90 | 10 | 14.3-14.6 | 3800 | 91.7 | 0.7 | Good general performance, suitable for casing and oil nozzle products |
| ZG11 | 89 | 11 | 14.3-14.7 | 2800 | 88.5 | 1.2-1.6 | Anti-wear, anti-erosion, good comprehensive mechanical strength, suitable for wear-resistant parts in the petroleum, chemical and mechanical industries. |
| ZG12X | 88 | 12 | 14.2-14.5 | 3000 | 89.5 | 1.0-1.2 | Anti-erosion, good comprehensive mechanical strength, suitable for impact-resistant wear-resistant parts, molds, and roller rings. |
| ZG15 | 85 | 15 | 13.8-14.2 | 3000 | 86.5 | 1.2-1.6 | |
| ZG15X | 85 | 15 | 13.8-14.2 | 4500 | 89.0 | 0.7 | Excellent wear resistance and toughness,it is suitable for making integral stamping dies, anti-vibration toolholders, etc. |
| ZG20 | 80 | 20 | 13.4-13.8 | 3100 | 85.0 | 1.0 | Excellent wear resistance and toughness |
| ZN06 | 94 | 6 | 14.5-14.9 | 2000 | 90.0 | 1.2 | Non-magnetic alloy, suitable for sealing ring, non-magnetic wear-resistant parts and corrosion-resistant parts. |
| ZN09 | 91 | 9 | 14.3-14.6 | 2300 | 89.0 | 1.2-1.6 | |
| ZN11 | 89 | 11 | 14.0-14.3 | 2600 | 88.0 | 1.2 | |
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