The steel tooth drill tricone bit is the most widely used drilling bit. When the milled tooth bit is working, the cutting teeth contact the bottom of the well alternately, the rock breaking torque is small, the contact area between the cutting teeth and the bottom of the well is small, the specific pressure is high, and it is easy to penetrate the formation; the total length of the working edge is large, so the wear is relatively reduced. The steel milled tooth bit can adapt to a variety of formations from soft to hard.
The main IADC CODE include 115, 116, 117, 126, 127, 135, 136, 137, 216, 217, 237, 246, 247, 317, 327 etc.
| IADC CODE |
WOB (weight on bit dia) |
RPM (R/Min) |
Application Formation |
| 116, 117 | 0.35-0.8 | 150-80 | Very soft formations with low compressive strength and high drill ability, such as clay, mud stone, chalk etc. |
| 126, 127 | 0.35-0.9 | 150-70 | Soft formations with low compressive strength and high drill ability, such as mud stone, gypsum salt, soft shale, soft limestone etc. |
| 136, 137 | 0.35-1.0 | 120-60 | Soft to medium soft formations with low compressive strength and high drill ability, such as medium soft shale, anhydrite, medium soft limestone, medium soft sandstone, soft formation with harder interbed etc. |
| 216, 217 | 0.4-1.0 | 100-60 | Medium formations with high compressive strength,such as medium soft shale, anhydrite, medium soft limestone, medium soft sandstone, soft formation with harder interbed etc. |
| 246, 247 | 0.4-1.0 | 80-50 | Medium hard formations with high compressive strength, such as abrasive shale, limestone, sandstone, dolomite, anhydrite, marble etc. |