PT Pertamina, a state-owned oil company, has announced plans to rebuild ageing facilities at its Offshore North West Java (ONWJ) and Offshore South East Sumatra (OSES) blocks in Indonesia to enhance oil output. The corporation will concentrate on replacing the production facilities as well as the main pipelines. Details about the required investment or timeline of the works have not been disclosed. A number of oil producing facilities have been operating on ONWJ and OSES facilities for more than 30 years, making them vulnerable to incidents such as oil spills and leaks.

ONWJ, often known as the North West Java Sea production sharing contract (PSC), has over 300 producing wells and over 200 offshore structures, 11 of which are continuously manned flow-stations for processing and compression. Oil output is continuously declining at Cinta and Widuri, the two main fields on the South East Sumatra PSC.