CNOOC debuts miscible gas flood technique at Wenchang oil project offshore China
CNOOC has brought onstream the Wenchang 9-7 oilfield development in the western Pearl River Mouth Basin offshore China.
This is said to be the first offshore low permeability oil field to employ miscible gas flooding for improved oil recovery.
Wenchang 9-7, in an average water depth of about 120 m, features a new drilling and production platform connected to infrastructure serving adjacent development facilities for development.
Over time the company plans to drill 18 production wells and seven gas injectors, with production peaking at about 12,000 boe/d in 2027. The oil a light crude.
CNOOC added that it continues to expand its network of gas pipelines at the Wenchang oil fields, while also recovering flare gas and waste heat.
Another innovation at Wenchang 9-7 is what the company claims is the world's first 5-MW offshore high-temperature flue gas ORC power generation system. This is designed to produce up to 40MM kWhr of electricity, reducing CO2 emissions by roughly 33,000 tons/year.
CNOOC recently brought onstream two other projects, including:
- The Caofeidian 6-4 Oilfield Comprehensive Adjustment Project is in the western part of the Bohai Sea in eastern China, in water depths of about 20 m; and
- The Wenchang 19-1 Oilfield Phase II Project is in the western part of the Pearl River Mouth basin in 125 m water depths.
And late last year, CNOOC delivered first production from its Huizhou 26-6 oilfield development in the Pearl River Mouth Basin. This is the company’s first deep buried hill reservoir project in the South China Sea, in a water depth of about 110 m.
