Stuck two-way check valve halts Marcellus well coiled tubing milling
operations
After a two-way check valve got stuck in the casing hanger profile of a
well in the Marcellus Shale, an operator decided to mill the wellhead to
retrieve it. However, instead of attaching to the magnet system, the valve fell
downhole—landing on a drillable bridge and frac plug. This meant there
was a well with several stimulated zones below a two-way check valve that would
need to be fished to finish the completion procedure. With no way to fish the
valve internally and a damaged external fishing profile, the valve was
extremely difficult to reach. Due to the minimal length of the two-way check
valve, there was a high probability that a burnover run could engage the fish
and frac plug with its slips still engaged, leading to additional
complications.
CoilTOOLS tools and solutions with tapered box tap fishes valve,
eliminates complex workover
Due to the OD size of the stuck valve, a conventional overshot was
impossible. Because of this, the operator sought to cement the fish in place
and burn over the fish to pull it from the wellbore. This could take anywhere
from 3 to 5 days.