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

摘要： 由于深海区存在异常丰富的油气资源，近年来国内外深海油气勘探不断升温。中国南海北部盆地实钻情况证明油 气资源丰富，勘探前景光明。中海油以作业者的身份在南海北部盆地共计完成8口水深1 500 m的深水井，形成了浅层灾害 防治、井身结构设计及优化、表层导管喷射下入、随钻地层压力监测、窄窗口安全作业、水合物防治、钻完井液和固井等一整 套钻完井关键技术。掌握该套技术对促进我国海洋石油工业可持续发展、增加油气产量和保障能源安全具有重要意义。 以中海油在陵水区块第一口深水井为例，介绍了该区域深水钻完井关键技术及应用效果。 

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