Publications

The S-3 and S-4 exploration wells in S Field in indonesia, were drilled in 2015 and 2016, respectively, and subsequently permanently plugged and abandoned. Positive result from production analysis and the exploration program led to the decision to convert these exploration wells into production wells. The exploration phase was completed with 13 3/8-in and 9 5/8-in casing strings, which were left cut off on the seabed during the plug and abandonment program. The objective of the well construction program was to restore well integrity by reconnecting the cut-off casings to surface with full metal-to-metal seal integrity. In Aaddition, the new connection must withstand the high axial loading conditions presented by the application with no loss of internal diameter and ensuring future completion program flexibility. The metal-to-metal, gas-tight sealing and high axial load rating criteria would need to be addressed to follow local regulatory requirements as well as to meet full well operating parameters. Several options, such as a mudline suspension system, external casing patch, and the drilling of a new well, were provided for this well construction program. An innovative metal-to-metal, gas-tight casing reconnect system was found to be the most effective and efficient solution to address the challenge. The existing 13 3/8-in and 9 5/8-in casing in the wells was cut and dressed to ensure the casing reconnect receptacle could be placed over the casing stump. The setting tool was then deployed at a predetermined depth using a reliable method to ensure accurate placement inside the receptacle. The setting tool was used to perform hydraulic expansion of the existing casing inside the casing reconnect receptacle to create sealing points. This solution provided both wells with a fully anchored metal-to-metal seal that was tested and found to meet full well operating parameters. The completion strings were installed without any issues.