The Jakarta Post reported four suspects in their 30s had been arrested by a West Java sea police unit last week.
Machining tools and hydraulic pipe was found as evidence, with a reported estimated value in the millions of rupiah.
The suspects were discovered on Wednesday night when they were found to be disassembling equipment onboard Pertamina's offshore Bravo Area platform SCA in the Subang regency, according to a local police spokesman.