Publications

PT. Pertamina Hulu Energi ONWJ operates a number of offshore oil & gas production platforms located in the Offshore North West Java concession area. Almost 80% of the offshore platforms have been in service for more than twenty years hence have exceeded their original design lives. However, as the production of hydrocarbon from the subsurface is considered still economical, the surface facilities need to be maintained for continued services beyond their design lives. In fact, the surface facilities have experienced deterioration due to their age, continuous exposure to the environment and operational activities. One of the major threats to the integrity of ONWJ offshore platforms is corrosion and this is shown by the results of the field inspections. The external corrosion protection systems which had been applied to the steel platforms were coating system and cathodic protection system using sacrificial anodes. As the original design life of these protection systems has been exceeded, their function against corrosion protection is no longer effective. A cathodic protection (CP) system retrofit program was implemented in 2009 for the ONWJ platforms and has installed new anodes for the majority of the active platforms since then. Due to local security issues and in order to minimize installation costs, a special design of the CP installation type was initiated. The CP system retrofit program was planned and executed with considerations of budget effectiveness and risk prioritization. Although some challenges were faced during installation and post installation, the CP system retrofit has provided a sufficient corrosion protection level to extend the service life of the aging platforms.