Line 142: |
Line 142: |
| {| class = "wikitable" | | {| class = "wikitable" |
| |- | | |- |
| + | | Hard, inert rock || Hole in gauge || Caliper = bit size |
| |- | | |- |
− | | Hard, inert rock | + | | Soft or [[Brittleness|brittle]] rock || Hole washes out || Caliper > bit size |
− | | Hole in gauge | |
− | | Caliper = bit size | |
| |- | | |- |
− | | Soft or [[Brittleness|brittle]] rock | + | | Permeable rock || Mudcake builds up || Caliper |
− | | Hole washes out
| |
− | | Caliper > bit size
| |
− | |-
| |
− | | Permeable rock | |
− | | Mudcake builds up | |
− | | Caliper | |
| |} | | |} |
| | | |