On March 25, CNOOC announced that China had discovered a high-yield oil and gas well drilling in a stratum over 5,000 meters in the Bohai Sea, with a tested daily oil and gas equivalent of nearly 1,400 cubic meters, setting a record for the highest daily production of China's offshore deep oil and gas exploration wells.

The well is located in the central Bohai Sea, close to the Bozhong Sag, the largest hydrocarbon-rich depression in the Bohai Sea. The structure is a volcanic rock reservoir, with a tested daily crude oil production of 855 cubic meters and a daily natural gas production of over 500,000 cubic meters, equivalent to about 1,400 cubic meters of oil and gas equivalent. The exploration prospects are broad.

"The exploratory well we deployed is buried in a buried hill over 5,000 meters under the sea. The formation temperature exceeds 180°C and the pressure exceeds 70MPa. It is a rare high-temperature and high-pressure ultra-deep oil and gas well in China. It is not easy to complete drilling and achieve high production." Zhou Jiaxiong, deputy general manager of CNOOC Tianjin Branch, said.