On December 3, CNOOC Limited announced that the Weizhou 11-4 oilfield adjustment and surrounding area development project has successfully commenced production.
The project is located at an average water depth of approximately 43 meters and leverages the existing facilities of the Weizhou oilfield cluster. It includes the installation of one smart wellhead platform and one central processing platform, which are connected to the existing platform facilities via bridges. A total of 35 development wells are planned, comprising 28 production wells and 7 water injection wells. The project is expected to achieve a peak production of approximately 16,900 barrels of oil equivalent per day by 2026, with the crude oil being classified as light crude.
The project adopts a collaborative development model of “three offshore processing centers + one onshore terminal,” establishing an integrated gathering and transportation hub to provide robust support for regional production capacity release and energy supply.
The core component of this production commencement is the newly built Weizhou 11-4 CEPD (Central Processing Platform), which stands as a heavyweight player in the operation.
The topside of the Weizhou 11-4 CEPD platform has a projected area exceeding that of seven standard basketball courts. Featuring a three-deck configuration (upper, middle, and lower), it weighs over 14,000 tons in total, making it the heaviest and largest offshore oil and gas platform in its operational waters.
Ensuring this massive steel fortress is securely anchored at sea is no small feat.
Given that its weight exceeds the domestic maritime floating crane capacity limit, and considering the need for retrofit connections with multiple in-service facilities, the multi-interface crossover operations pose unprecedented difficulty.
Faced with the formidable task, the project team employed the floatover installation method to complete both the offshore installation and the commissioning of all systems, achieving the entire process in just 18 days.
The team innovatively established an “Integrated Production, Engineering, and Construction” management model. They formed a specialized task force to optimize progress on an hourly basis and coordinated the inerting of process systems with construction intervals, ensuring seamless integration across all stages.
From project initiation to completion, the team successfully commissioned 123 subsystems and completed 3,347 control system point tests at the central control room. By overcoming numerous technical and management challenges, they ultimately ensured the safe and secure installation of this colossal structure.
Upon successful commissioning, the Weizhou 11-4 oilfield adjustment and surrounding area development project will establish an upstream gathering and transportation center for the Weizhou oilfield cluster. It will also integrate the Weizhou 11-4 oilfield into the local power grid, enabling coordinated regional energy development and efficient operation.
In addition to enabling collaborative operations and resource sharing between the two platforms, the project has also carried out adaptation modifications for critical equipment such as process pipelines and water injection pumps on existing facilities, including the Weizhou 11-4 CEPA platform and the Weizhou 11-4NB platform, further enhancing the overall operational efficiency of the system.
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Post time: Dec-11-2025