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| Formation | ULTRA SOFT with stick layers & low compressive strength | SOFT with low compressive strength & high drillability | SOFT to MEDIUM compressive strength & high drillability | SOFT to MEDIUM with low compressive strength with nonhomogenous layers | MEDIUM to HARD with medium compressive strength & small abrasive layers | HARD DENSE with high compressive strength but non abrasive | HARD DENSE very high compressive strength & abrasive | ULTRAHEAD & ABRASIVE | | Rock Type | Gumbo Clay Marl | Marl Salt Anhydrite Shale Sand | Shale Sand Chalk | Shale Sandstone Limestone | Shale Sandstone Limestone | Silstone Limestone Dolomite | Sandstone Shale | Volcanic | | PDC Bit | G574, AG574, G554, AG554, BD554, STR554, R574, G604 | AG574, AG526, BD535, G605P,G526, BD605, STR605, G505, GS605F, G544P, STR535 | AG527, BD536P, BD506XL, G545, G536, STR434, G405, GS605T, G535, G605, G544H, STR426, G605KG, STR325, G435 | G535, G536XL, G545H, BD536, BD445, G445XL, G406, G407, BD406, GS606, STR434, STR445, STR335, G536X, BD606, BD506XL, BD606KG, BD445ZT, G506 | G447XL, G535, BD447, STR447, STR386, BD449, BD606KG, G408, BD407, BD408 | G447XL, G449XL, BD447, BD449, STR447, STR386, BD409, STR382 | STR386, BD308 | STR386, BD308 | | Ballaset Bit | ---- | ---- | ---- | S225, S725 | S226, S248, S725 | S725, S278, S280, S279, S281 | S278, S280, S790, S281 | S279, S280, S281 | | N.D Bit | ---- | ---- | ---- | D331, D41 | D41, D24 | D24 | ---- | ---- | | IADC Classification: Rock Bits | 111-126 417 | 116-126 417-447 | 126-127 417-447 | 417-447 | 437-517 | 517-547 | 547-637 | 647-837 |
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