On April 23, 2022, the world's first large-scale offshore thermal recovery and development oilfield for ultra-heavy oil, the first phase of CNOOC Lvda 5-2 North Oilfield, was successfully put into production.

Some achievements of the thermal recovery technology system of steam huff and puff in horizontal wells of ultra-heavy oil in Bohai Oilfield have reached the international advanced level.

Lvda 5-2 North Oilfield is located in the Liaodong Bay area of the Bohai Sea, with an average water depth of about 32 meters. The project is expected to achieve a peak annual output of 400,000 tons of crude oil in 2024. After the oilfield is fully put into production, it is expected to produce more than 6.5 million tons of crude oil. All of them will be refined into asphalt and a 4-lane expressway of more than 5,000 kilometers can be laid, which is equivalent to a straight line from Beijing to Sanya. Round trip distance.

Lvda 5-2 North Oilfield belongs to unconventional heavy oil. The viscosity of crude oil in the formation exceeds 50,000 mPas, which is more than 20 times that of the thickest crude oil developed in the Bohai Sea. It is close to solid asphalt at room temperature and cannot flow at all. The proven reserves of unconventional heavy oil in Bohai Oilfield exceed 600 million tons, accounting for 14.5% of the total proven geological reserves in Bohai Sea. This part of the dormant underground resources will be awakened, and the scale of reserves will be converted into production, which will provide Bohai Oilfield with an increase in production of 40 million tons. important support.Editor/Ma Xue