关键词: 深水钻井, 钻完井液, 自营深水井, 中海油, 南海北部盆地 

Abstract: Due to the extremely rich oil and gas resources in deep-sea area, the deep-sea oil and gas exploration at home and abroad has been heated up in recent years. The actual drilling in northern basins of South China Sea proves that the oil and gas resources are abundant and the exploration prospect is bright. As an operator, CNOOC has completed a total number of 8 deepwater wells with the depth of 1500 m in northern basins of South China Sea, forming a complete set of key drilling and completion technologies, such as shallow disaster prevention and control, well structure design and optimization, surface conduit injection and running, formation pressure monitoring while drilling, narrow window safe operation, hydrate prevention and control, drilling and completion fluid and cementing. Mastering this set of technologies is important to promote the sustainable development of China's offshore oil industry. It is of great significance to increase oil and gas production and ensure energy security. Taking the first deepwater well completed by CNOOC as an operator in Lingshui Block as an example, this paper introduces the key technologies and application results of deepwater drilling and completion in this area. 

Key words: deepwater drilling, self operated deep well, CNOOC, northern basins of South China Sea