| LADC bit classification |
Formation |
Rock Type |
Tricone |
HF |
Black Ice |
Ballaset |
N.D |
111-126
417 |
ULTRA SOFT
with stick layers and low compressive strength |
Gumbo
Clay
Marl |
GTX-1
MX-1
MAX-GT3
MAXGT-03
MX-03 |
HF544
HF424AW |
|
|
|
116-126
417-447 |
SOFT
with low compressive strength & high drillability |
Marl Salt
Anhydrite
Shale
Sandstone |
GT-1
ATJ-4
MX-03
MAXGT-09
MX-09
MX-18 |
HF424AW
HF544
HFC475 |
HF614ST
HF526AW
HF535P |
|
|
126-127
417-447 |
SOFTTO MEDIUM
compressive strength with homogenous |
Shale
Sandstone
Chalk |
ATJ-4/G4
MX-03/09
MAXGT-09
MX-09
MX-18 |
HF565
HF424AW
HF535
HF536LX
HF544
HF666
HFC475 |
HF445P
HF545P
HF526AW
HF535P
HF536P
HF614ST |
|
|
| 417-447 |
SOFT TO MEDIUM
with low compressive strength with nonhomogenous layers |
Shale
Sandstone
Limestone |
GT-09
MX-09
MAXGT-09
MX-09
MX-18 |
HF565
HF447LX
HF535
HF5361LX
HF447LX
HF666
HFC475 |
HF536P
HF445P
HF545P
HF614ST |
|
HT528 |
| 437-517 |
MEDIUM TO HARD
with medium compressive strength and small abrasive layers |
Shale
Sandstone
Limestone |
MX-09
MX-18
ATJ-22
MAXGT-20
MX-20 |
HF449
HF447LX
HF536LX
HF666 |
HF535P
HF447P
HF449P |
HBC226
HB337 |
HT528
HT855
HTC201 |
| 517-547 |
HARD DENSE
with hight compressive strength but non abrasive |
Siltstone
Limestone
Dolomite |
MX-20
MAXGT-20
MX-30
MTJ-33
MX-35 |
HF447LX
HF449LX |
HF447P
HF449P |
HB337
HBC279 |
|
| 547-637 |
HARD DENSE
with high compressive strength and abrasive |
Sandstone
Shale |
MX-35C
MAX-44
ATJ-44 |
|
|
HBC279 |
HT855 |
| 647-837 |
ULTRA HARD AND ABRASIVE |
Volcanic |
ATJ-66
ATJ-88
ATJ-99 |
|
|
HBC279 |
|
