The reversing sub is also called reversing spear which is a special tool for reversing stuck drill stem above stuck point in drilling and work over operation . In treatment of stuck drill stem, it can work as a fishing pin tap in reversing operation.When fish is stuck or can not be reversed in fishing or reversing operation , the fish can be reversed from reversing sub and the fishing drill tool can be tripped out .
Technical parameters and specifications
| O.D. |
Thread connection (LH) |
Fishing thread (RH) |
Tensile Strength (KN) |
Torsion Strength (KN・m) |
| mn |
in |
| 105 |
4 1/8 |
2 7/8IF |
2 7/8IF |
500 |
9 |
| 121(127) |
4 3/4(5) |
NC38 |
NC38 |
900 |
15 |
| 165 |
6 1/2 |
NC50 |
NC50 |
1500 |
35 |
| 178 |
7 |
5 1/2FH NC50 |
5 1/2FH NC50 |
2000 |
50 |
| 197 |
7 3/4 |
6 5/8REG |
6 5/8REG |
2500 |
65 | |
