The Well Cleaner® recovered 12.6 liters with three bailers and progressed four meters during the first run. However, recovery averaged only two liters of sand per run over the next four runs with no depth progress. Moreover, the recovered sand was contaminated with pieces of metal, likely gun debris. It was suspected that a hard restriction was blocking the Well Cleaner® progress.
The Well Miller®, equipped with a 3.5″ tapered scale bit, was then run in hole. Milling commenced at the point where the Well Cleaner® had hung up on the previous run. The Well Miller® completed four milling cycles of three-meter intervals, before being pulled out of the hole and swapped for the Well Cleaner®.
After the milling run, the recovery efficiency of the Well Cleaner® increased significantly. Recovery over the next five runs averaged between 16 and 17 liters per run. The final tag depth was 4934.7m, deeper that the target depth of 4921m.
Welltec® achieved the client’s objective. The combination of the Well Cleaner® and Well Miller® allowed the client to regain access to the reservoir for additional perforation, leading to increased production. Using Welltec’s eline interventions resulted in a faster, and more cost effective, solution than alternatives, such as coiled tubing.