State-owned Pakistan State Oil will partner with Saudi state oil giant Aramco on the project. : Saudi Arabia has agreed in principle to invest in a new oil refinery in Pakistan's deep-water port of Gwadar, the South Asian nation's petroleum minister said on Thursday. State-owned Pakistan State Oil will partner with Saudi state oil giant Aramco on the project, Petroleum Minister Ghulam Sarwar Khan told reporters. "They showed an interest to immediately invest in the refinery," Khan said, describing a visiting Saudi delegation.