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 |
