Pulling downhole tools with external fish necks
Evolution's ERB and ERS Pulling Tools are designed for jobs in which extensive downward jarring is required. Tools use upward jarring to release when necessary. The catch dogs in the R pulling tools engage the fish neck of the device to allow it to shear with upward jarring.
The R pulling tool can be modified as follows:
• The RB pulling tool (R body with a B core) pulls Otis® B, C, and W lock mandrel assemblies and mandrel assemblies with full relative motion
• Otis® stlyle RS pulling tool (R body with S core) pulls Halliburton S mandrel assemblies
1. When the pulling tool slides over the fishing neck that is to be retrieved, the toolstring weight compresses dog spring forcing the dogs out as they slide up the beveled grooves of lower skirt to latch on fish.
2. Once the inner flange of the pulling tool dogs pass the bottom flange of the fishing neck, the dog spring tension returns dogs to the bottom of beveled grooves of the lower skirt.
3. When the jarring impact has sheared the “R” and “S” pulling tools the core spring tension pushes the core up, raising the dogs which slide up the beveled dog grooves to the released position.
4. To re-pin the “R” and “S” pulling tools rotate shear pin fall out. With the use of a core extractor, to compress the core spring the core is pulled down in the pulling tool until the shear pin holes line up. Sheared pieces of the pin is removed a new pin is installed.
5. Rotating the shear pin retainer ¼ turn completes the re-pinning of the tool.
When servicing look for damaged or cracked parts.
With the “JD” series, ensure “S” pulling tool will have enough travel to complete shearing operation.
Although they look similar at a glance 2” and 2 1/2 “nominal size pulling tool dogs can not be interchanged. The 2 ½” are slightly longer and thicker at the bottom edge, and if used in a 2” pulling tool the dogs will not release when the pin has been sheared.