Offshore the Well Stroker was rigged up into the subsea lubricator (SSL) and deployed. Upon SSL connection to the HXT the Well Stroker was lowered down latching the pulling tool into the upper crown plug’s internal pulling profile. E-line then pulled the toolstring up extending the Well Stroker’s piston rod and verifying that the pulling tool had latched. The Well Stroker was then activated, setting the anchors in the pre-planned location and applying sufficient force to pull the plug free. Then the entire assembly and the SSL were retrieved to surface. Although the Well Stroker has a bi-directional ram, only up-strokes were performed in this operation as down-strokes would have resulted in releasing from the plug.
In just 14 strokes, the Well Stroker accomplished what 347 slickline pulling attempts couldn’t; freeing the upper crown plug. The excessive amount of strokes required to pull the plug is likely due to hydrate formation between the plugs as saltwater entered during slickline attempts. The alternative to the Well Stroker contingency would have been to bring in a workover rig with full surface riser capability. This would have increased the operational costs significantly as well as delaying any production. However, the use of an e-line solution facilitated the continuation of the RLWI operation with minimal NPT and at a much lower costs. The Well Stroker can be fitted with the Well Key® for further mechanical services and combined with a number of other e-line intervention tools. Together they offer a perfect solution for contingency planning on RLWI operations.