for fishing drill rods, oil pipes, casings
Releasing Spear
Application
The releasing spear, as a kind of fishing tool, is typically used for fishing drill rods, oil pipes, casings, etc. in the oil drilling industry. It has simple structure, high strength, and works from the inside diameter of the fish.
Releasing Spear Advantages:
1. Check the catch size, and make sure the outer diameter of releasing spear should be 1-2mm larger than the inner diameter of fish.
2. Grease the screw of the mandrel.
3. Fasten the nipple and fix the slips at the position where the release ring can be blocked.
4. The fishing drilling configuration usually consists of releasing spear, bumper sub and driller.
Technical Parameters
| Type | Inner Diameter of fish | Tensile load | Left-hand Thread |
| LM-60 | Φ46.1Φ48Φ50.7 | 150KN | NC26 |
| LM-114 | Φ80Φ88.9Φ90Φ93.7 Φ95.3Φ97.2 | 470KN | NC38,NC50 |
| LM-168 | Φ144.2Φ147.1Φ150.4 Φ151.5Φ153.7 | 1090KN | NC50 |
| LM-245 | Φ216.8Φ220.5Φ224.4 Φ245.4Φ330 | 2400KN | 6-5/8REG |
| LM-324 | Φ300Φ302Φ304Φ306 | 2600KN | 6-5/8REG |
| LM-340 | Φ313.6Φ315.3Φ317.9 Φ320.4Φ322.9 | 2600KN | 6-5/8REG |
Roschen Full Circle Releasing Spears are used to internally engage and retrieve all sizes of tubing, drill pipe, and casing.
It may be used with internal cutters for cut and pull operations. Full Circle Releasing Spears are designed to evenly distribute expansion strain over a long vertical section of a fish and ensure positive internal engagement. The design of the slips and the effect of the body tapers upon the slips permits tremendous pulling and jarring strains with no danger of distortion to the fish.
