The number of tricone bit
Cone tricone bit more complex type and structure of various manufacturers tricone bit each code, generally used international drilling
Contractors Association (IADC) standard tricone bit is numbered for easy identification and selection.
IDAC is standard jet set tricone bit, tricone bit encoded using three numbers represent, the significance of the numbers below:
Each digit indicates the type and applies the teeth formation.
1 - milling, soft formations China; - milling, medium to medium hard formations; 3 - milling, hard formations; 4 - tipped, very soft to soft ground
Layer; 5 - tipped, soft to medium hard formations; 6 - tipped, medium hard formations; 7 - tipped, hard formations; 8 - tipped, extremely hard formations.
Two numbers indicate the lithology being drilled from soft to hard is divided into four grades 1,2,3,4.
Three numbers indicate the diameter of the bearing structure and security features.
1 - Standard (non-sealed rolling mill tooth tricone bit); 
2 - with air cooling and cleaning of the rolling bearing tricone bit (milling and tipped tricone bit); 
3 - rolling axis gage tricone bit ("T"-type teeth and tipped the gauge gage); 
4 - Scroll sealed bearing tricone bit (mill tooth tricone bit); 
5 - rolling sealed bearings tipped gage tricone bit; 
6 - Rolling sealed bearing tricone bit; 
7 - Rolling sealed bearings gage tricone bit (milling and tipped tricone bit); 
8 - directional drilling tricone bit; 
9 - Other tricone bit.
For example, tricone bit number, "537," a digital representation tipped cone tricone bit, suitable for soft to medium hard formations; two
Digit soft to hard three, namely hard formations; three digits sliding seals bearing the gauge tricone bit.
3 About two kinds of projects with a large-caliber reamer cone tricone bit
(1) Multi-step reamer cone tricone bit (Figure 5-17)
tricone bit Features: tricone bit body is steel castings, was third-order trapezoidal, 20 single milling cutters are staggered by three concentric circles
Cloth in three ladder (the number of cutters from the inside out as 4,8,8 months). Corresponding to each cone nozzles are opened, fluid
Rinse with jet cone beam and bottom of the hole. tricone bit body bottom connection-oriented heart tube and trails scraper tricone bit.
Conditions: 5 to 7 in the hard bedrock and bedrock section 8 (such as limestone, sandstone), positive cycle reaming drilling. tricone bit Features: tricone bit chassis uniform four milling cutters, then under the guide tool, the upper with a dedicated connector J250