The cluster is located about 250 km southeast of Shenzhen.
The cluster includes Liuhua 16-2, Liuhua 20-2 and Liuhua 21-2 with an average depth of 412 meters, the deepest-water project in China's offshore oil exploration sector.
At peak in 2023, Liuhua 21-2 is expected to generate around 15,070 b/d of crude oil.
Associated gas is captured via the light hydrocarbon recovery system to reduce methane emissions.
The development, in 437 m (1,434 ft) water depth, is based on a new subsea production system with 8 wells, connected to existing processing facilities.
CNOOC Limited holds 100% interest in Liuhua 21-2 oilfield and acts as the operator.
Less than 2 weeks ago, CNOOC also started production from its Luda 29-1 oilfield, located in Liaodong Bay of Bohai Sea, with a water depth of about 32 meters.