Customization: | Available |
---|---|
Customized: | Customized |
Standard: | JIS, AISI, API |
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ROLLER CONE BITS |
ROLLER CONE BIT (M/H) |
FORMATION HARDNESS |
FORMATION |
ROCK TYPE |
COMPRESS STRENGTH |
|
WEM |
OBM |
|||||
111/124 |
15-30 |
18-33 |
Very soft |
soft formation with sticky layers and low compressive strength |
clay,silts, sands |
<25 MPa |
116/137 437 |
9-15 |
12-18 |
soft |
soft formation with low compressive strength and high drill ability |
claystone,marl, lignite,tuff, sandstone |
25-50 MPa |
126/139 517/527 |
4.5-9 |
6-12 |
Medium soft |
soft to medium formation with low compressive strength interb dded with hard layers |
claystone,marl lignite,sandstone silts anhydrrites tuff |
50-75 MPa |
211/217 517/537 |
2.5-6 |
3-6 |
Medium |
medium to hard formation with high compressive strength and small abrasive layers |
mudstone , limstone, anhydrites, sandstone |
75-100 MPa |
211/236 537/617 |
1.5-2.5 |
1.5-3 |
Medium hard |
hard and dense formation with very high compressive strength but non-abrasive |
limestone, anhydrites, dolomite |
100-120MPa |
311/347 627/637 |
1-1.5 |
1-1.5 |
Hard |
hard and dense formation with very high compressive strength and some abrasive layer |
shale,sandstone ,siliceous, siltstone |
100-200MPa |
637 /737 /837 |
1 |
1 |
Very hard |
extremely hard and abrasive formtions |
quartzite, lgneous ,rocks |
>200MPa |