|
Bit type |
Normal WOB(lbs) |
Rotary Speed（RPM） |
Cutting structure |
Applicable formation |
|
|
K412 |
15000-40000 |
70—150 |
Insert bit, conical spherical compacts in inner row and wedge compactsin outer row |
very soft and Soft with low compressive strength and high drillability, such as soft shale, clay and soft limestone, etc. |
|
K432 |
15000-40000 |
70—150 |
Insert bit, conical spherical compacts in inner row and conical spherical or wedge compacts in outer row |
very soft and Soft with low compressive strength and high drillability, such as soft shale, clay and soft limestone, etc. |
|
K532 |
20000-55000 |
50—120 |
Insert bit, conical spherical compacts in inner row and conical spherical or wedge compacts in outer row |
Soft to medium soft or soft with hard stringers with low compressive strength, such as sandstone, shale,granite and some marble, etc. |
|
K612 |
25000-65000 |
50—110 |
Insert bit, conical spherical compacts in inner row and conical spherical or spherical compacts in outer row |
Medium hard with hard stringers and high compressive strength, such as hard shale, hard limestone, basalt and quartzite, etc. |
|
K632 |
25000-75000 |
50—100 |
Insert bit, conical spherical compacts in inner row and conical spherical or spherical compacts in outer row |
Medium hard with hard stringers and high compressive strength, such as hard shale, hard limestone, basalt and quartzite, etc. |
|
K712 |
35000-85000 |
50—90 |
Insert bit, conical spherical compacts or double round top inserts in inner row, spherical compacts in outer row |
Hard with high compressive strength and high abrasive, such as taconite, banded iron and quartzite, etc. |
|
K732 |
35000-85000 |
50—90 |
Insert bit, conical spherical compacts or double round top inserts in inner row, spherical compacts in outer row |
Hard with high compressive strength and high abrasive, such as taconite, banded iron and quartzite, etc. |
|
K832 |
45000-90000 |
40—80 |
Insert bit, double round top inserts or spherical compacts in inner row, spherical compacts in outer row |
Extremely hard with high compressive strength and high abrasive, such as chert hematite ore , quartzite and granite, etc. |
