The new expansion phase follows a steady rise in output since Japan's Japex sold the block to local company Petrogas, a subsidiary of Oman's MB Holding Company, in 2002.
Petrogas immediately sold a 50% stake to China's CNPC and the pair formed Daleel Petroleum to operate the field, which was then producing only 4400 bpd.
Output has increased nearly fourfold as Daleel added a new rig to expand horizontal drilling.
