China’s largest offshore gas field, "Deep Sea No. 1," has entered full production following the commissioning of its final subsea well on June 25 in the waters off Yacheng, Hainan.
Source: People’s Daily
China’s largest offshore gas field, "Deep Sea No. 1," has entered full production following the commissioning of its final subsea well on June 25 in the waters off Yacheng, Hainan. With all 23 subsea wells now operational, the field has reached a peak daily output of 15 million cubic meters of natural gas.
The gas field is being developed in two phases. Phase I began production in June 2021. Phase II added 12 subsea wells across three zones—north, south, and east—as well as one new jacket platform, a subsea production system, five seabed pipelines, and five deepwater umbilicals. Together, these facilities form a vast production cluster spanning more than 170 kilometers and operating at depths of over 1,500 meters. Offshore resources have become a key growth area for China’s oil and gas output. In 2024, offshore crude oil accounted for roughly 80% of the nation’s increase in crude production. Around two-thirds of recent offshore oil and gas discoveries have been located in deepwater zones.
To support Phase II development, technical teams partnered with universities and research institutes to pioneer five world-first technologies for drilling and completing high-pressure deepwater wells. These advances accelerated the localization of equipment and components, boosting overall operational efficiency by more than 30%.
Now operating at full design capacity, Deep Sea No. 1 is expected to produce over 4.5 billion cubic meters of gas annually. Output from the field is transmitted to onshore terminals in Hong Kong, Sanya, and Zhuhai, helping to supply the Guangdong-Hong Kong-Macao Greater Bay Area and the Hainan Free Trade Port, while also feeding into the national natural gas pipeline network.
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