In 2025,China\u2019s offshore oil and gas industry achieved a strategic transition from isolated ultra-deepwater breakthroughs to scaled and stable production.The full commissioning of Phase II of the \u201cDeep Sea No. 1\u201d ultra-deepwater gas field on 25 June 2025 marked the large-scale production stage of China\u2019s first self-operated ultra-deepwater gas field.All 23 subsea gas wells were put into operation; maximum operating water depth exceeded 1,500 m,maximum well depth exceeded 5,000 m,peak daily gas output reached 15 million m\u00b3,and total proven gas reserves exceeded 150 billion m\u00b3.In April 2025, CNOOC\u2019s independently developed sixth-generation ultra-deepwater semi-submersible drilling platform completed a 3,500\u20134,000 m ultra-deepwater exploration well in the South China Sea in only 11.5 days,setting a national record for ultra-deepwater drilling cycle.The \u201cDeep Sea No. 1\u201d energy station,the world\u2019s first 100,000-tonne-class deepwater semi-submersible production and storage platform,integrated three world-class innovations and 13 domestically pioneered technologies.Its development model\u2014subsea production systems,shallow-water jacket platforms,and remote-control systems for deepwater semi-submersible platforms\u2014spans over 170 km and more than 1,500 m of water depth,addressing deepwater,high-temperature, and high-pressure challenges.Internationally, the B\u00fazios Phase VI project in Brazil,in which CNOOC participated, was commissioned on 31 December 2025,marking the first large-scale application of China\u2019s ultra-deepwater engineering technology to an international large oil and gas field.These advances are underpinned by China\u2019s deepwater resource potential:over half in deepwater, while offshore crude output reached about 65.5 million tonnes in 2024,contributing over 80% of domestic crude production growth.They strengthen national energy security,drive high-end equipment innovation,and enhance China\u2019s role in global deepwater energy cooperation.<\/p>\n
Keywords:ultra-deepwater oil and gas;Deep Sea No. 1;semi-submersible production platform;subsea production system;energy security; international energy cooperation<\/p>\n
Cong Wei,professor\uff0cPh.d on economic.Now he is the Principal research fellow of CNOOC Energy Economics Institute\uff0cand his office is now based in Beijing China.deputy director of Southeast office\uff0cHe was once a post-doctoral reseacher in Academy of Chinese Energy Strategy. He has also been the director of ASEAN Office(Based in Bangkok,Thailand)and the director of Latin America Office(Based in Santiago de Chile) of GEIDCO\uff08Global Energy Interconnection Development and Cooperation Organization\uff09,and also been thevice director of economics research office at CPPEI(Petrochina Planning and Engineering Institute),and served as a civil-servant at Policy and Law department of National Energy Adiministration of PRC during 2008-2013.He was the chief member of \u201cChina\u2019s Energy Policy:2012\u201d white paper dafting penal.His main research area involves energy economy and its policies,market-oriented reform of energy system,the natrual gas economy and its developmetal strategies etc.Now he also takes the post of the editorial board member of ENERGY REVIEWS,the councilor of the Energy committee of System Engeering Sociaty of China.His published book include China\u2019s Path To Low-cabon Energy Sociaty,The Path Selection of the Ragulation Policies about the Coal Productive Capicity.<\/p>\n","protected":false},"featured_media":5194,"template":"","meta":{"_acf_changed":false},"schedule":[],"speaker-category":[6],"class_list":["post-5219","speaker","type-speaker","status-publish","has-post-thumbnail","hentry","speaker-category-speakers"],"acf":[],"yoast_head":"\n