The oil fields at Balikpapan, Miri, and Brunei, all on the island of Borneo, plus those on the island of Tarakan, a small island close to Borneo, all produce “sweet crude” that may be burned in ship’s boilers as bunker fuel. But all of these fields produce oil that is also high in sulfur content which damages the boiler tubes. This damage requires frequent boiler tube cleaning or replacement.
My father-in-law, now deceased, was a production engineer at the Miri field when the Japanese invaded in 1941. He told me that in 1941, there was only one small refinery on the entire island of Borneo and that was at Balikpapan. The dutch destroyed the wells and badly damaged the refinery when the Japanese attacked despite being warned that reprisals would be the consequence. As at Tarakan, the Japanese murdered all the surviving Dutch inhabitants, including dozens of women and children.
The Japanese subsequently repaired the refinery and put it back into production. It was bombed by the Allies in 1944, but continued to produce at a reduced rate. After the war the refinery was updated and enlarged and still is in operation today. But oddly enough, it was not designed to refine the oil produced by the wells at Balikpapan and that oil is now being exported in it’s crude form.