During a Riserless Light Well Intervention (RLWI), Welltec has set two new world records: successful removal of asphaltenes on e-line; and a new RLWI water depth record of 3,991 ft (1,216 m).
An operator in the Gulf of Mexico planned to set a lock-open sleeve across a failed subsurface safety valve on one of their subsea wells. The well had not been re-entereed since it was put on production several years ago and subsequently the downhole conditions were unknown. After several failed attempts to run slickline, where the toolstring kept hanging up after only 1,000 ft (305 m), a decision was made to run the e-line Well Tractor and Well Cleaner RCB with integrated bailers to mill through the obstruction and capture any debris. This toolstring made it past the slickline hang up depth and all the way down to 5,727 ft (1,746 m), where it encountered some sort of blockage.
The Well Cleaner RCB was engaged and milled ~ 5 ft (1.5 m) of an unknown material until the toolstring became stuck. It was retrieved and at surface the bit was found to be packed with solid debris and the bailer sections were full of dense, hard packed ashphaltenes.
Based on this unexpected discovery, the operator decided to suspend further operations pending full sample analyses. Due to Welltec’s e-line solution, the operator avoided additional costs and were able to make an informed decision on how to best plan the way forward.