NO. |
IADC |
Recommend Parameters |
Suitable Formation |
WOB (KN/mm) |
RPM (r/min) |
1 |
116,117 |
0.35~0.8 |
150~80 |
Extremly soft formation with low compressive strength and high drillability,such clay,mudstone,cretaceous |
2 |
126,127 |
0.35~0.9 |
150~70 |
Soft formation with low compressive strength and high drillability,such as mudstone,gypsum,salinastone,soft shale,soft limestone |
3 |
136,137 |
0.35~1.0 |
120~60 |
Soft to mid-soft formation with low compressive strength and high drillability,such mid-soft shale,anhydrite,mid-soft limestone,mid-soft sandstone and soft formation with hard interbeds |
4 |
216,217 |
0.4~1.0 |
100~60 |
Soft to medium formation with low compressive strength,such as mid-soft shale,mid -soft limestone,mid-soft sandstone and soft formation with hard interbeds |
5 |
246,247 |
0.4~1.0 |
80~50 |
Mid-hard formation with high compressive strength,such as hard shale,limestone,sandstone and dolomite |
6 |
417,437,447 |
0.35~0.9 |
150~70 |
Extremely soft formation with low compressive strength and high drillability,such as clay,mudstone,cretaceous,gypsum,salinastone,soft shale and soft limestone |
7 |
517,527 |
0.35~1.0 |
140~60 |
soft formation with low compressive strength ,such as mudstone,gypsum,salinastone,soft shale and soft limestone |
8 |
537,547 |
0.45~1.0 |
120~50 |
Soft to medium formation with low compressive strength,such as mid-soft shale,mid -soft limestone,mid-soft sandstone and medium formation with harder abrasiveness interbeds |
9 |
617,627 |
0.45~1.1 |
90~50 |
Mid-hard formation with high compressive strength,such as hard shale,limestone,sandstone,and dolomite |
10 |
637 |
0.5~1.2 |
80~40 |
Hard formation with high compressive strength,such as sandstone,limestone,dolomite and anhydrite,marble |