Coring tools：
Brief introduction:
Coring tool is a tool to obtain formation sample in the petroleum geologic exploration drilling operation.
Specifications ：
Model | Outside O.D×I.D(mm) | Inside O.D×I.D(mm) | Top thread | Bit size
| Rock core diameter (mm) |
川8—3 | 180×144 | 127×111 | 4 1/2″ IF | 8 1/2″ | 105 |
川6—3 | 133×101 | 88.9×75.9 | 3 1/2″ IF | 6 1/2″ | 70 |
川5—4 | 121×93 | 88×72 | 3 1/2″ IF | 5 7/8″—6 1/2″ | 66 |
川6—4 | 133×101 | 88×76 | 3 1/2″ IF | 5 7/8″—6 1/2″ | 70 |
川7—4 | 172×136 | 121×108 | 4 1/2″ IF | 7 1/2″—9 5/8″ | 101 |
川8—4 | 180×144 | 127×112 | 4 1/2″ IF | 8 1/2″—9 5/8″ | 105 |