Description
IADC code according to the type of use that will be given
IADC | Rock formation | WOB (KN/mm) | WOB (KN/mm) |
116/117 | Low compressive strength, high drilling capacity and extremely soft formation, such as soft shale, clay, conglomerate, etc. | 0,35 ~ 0,90 | 180 ~ 80 |
126/127 | Low compressive strength, high drilling capacity and soft formation, such as shale, clay, soft limestone, salt rock, etc. | 0,35 ~ 1,00 | 180 ~ 80 |
136/137 | Soft to medium soft with low compressive strength or soft with hard interbedded layer, such as anhydrite, soft limestone, sandstone, etc. | 0,37 ~ 1,05 | 130 ~ 60 |
216/217 | Medium hard formation with relatively high compressive strength and hard interbedded layer, such as hard shale, sandstone, limestone, etc. | 0,5 ~ 1,20 | 100 ~ 50 |
