hina’s state-owned oil and gas firm China National Offshore Oil Corporation (CNOOC) has brought online the Kenli 10-2 oil field (Phase I), the largest shallow lithological oil field offshore China.
The project is located in southern Bohai Bay, with an average water depth of about 20 meters.
The main production facilities include a new central platform and two wellhead platforms, which leverages the adjacent existing facilities for development.
According to CNOOC, 79 development wells are planned to be commissioned, including 33 cold recovery wells, 24 thermal recovery wells, 21 water injection wells and one water source well.
The project is expected to achieve a peak production of approximately 19,400 barrels of oil equivalent per day in 2026. The oil property is heavy crude.
Kenli 10-2 oil field is the first lithological oilfield with proven in-place volume of 100 million tons discovered in the shallow depression zone of the Bohai Bay Basin.
It is being developed in two phases. CNOOC has adopted an innovative combined development approach of ‘conventional water injection combined with steam huff and puff and steam flooding’, providing strong technical support for the efficient utilization of oil reserves.
The project’s platform integrates both conventional cold production and thermal recovery systems, and is equipped with over 240 sets of key equipment. It is one of the most complex production platforms in the Bohai region and the first large-scale thermal recovery platform for heavy oil in southern Bohai Bay, CNOOC claims.
As China’s first offshore dendritic heavy oil reservoir under development, the Kenli 10-2 oilfield exhibits distinctive “dispersed, narrow, thin and heterogeneous” reserve distribution characteristics. The hydrocarbon deposits are trapped within elongated, sinuous sand bodies that interweave like shadows of tree branches on the ground – forming the namesake dendritic patterns – making extraction exceptionally challenging.
Cai Hui, Chief Reservoir Specialist at CNOOC Tianjin Branch’s Bohai Petroleum Research Institute, stated:“The ‘dendritic reservoir + thermal heavy oil recovery’ development model represents a globally rare approach in both reservoir type and extraction methodology. Through dedicated R&D breakthroughs, we have established a comprehensive technical system for complex viscous oil development. This system enables precise 3D reservoir characterization, achieves targeted thermal steam injection for optimized oil displacement, and provides critical technological support for the high-efficiency development of Kenli 10-2 Oilfield.”
Facing challenges including scattered reserves distribution and wide-ranging crude oil viscosity, the project innovatively adopted a combined development approach of “water flooding + steam huff-and-puff + steam drive.” The central processing platform was designed with dual production systems for conventional cold production and thermal heavy oil recovery, integrating multiple functions and equipped with over 240 sets of critical equipment. It is currently one of the most complex production platforms in the Bohai region in terms of process flow and the first large-scale thermal recovery platform in the southern Bohai Bay.
“The successful commencement of production of this project marks a new stage in the development of complicated heavy oil reservoirs offshore China. It will strongly support the Company’s Bohai Oilfield to achieve the annual gross production target of 40 million tons, contributing to the Company’s high-quality development through high-level operations,” said Yan Hongtao, President of CNOOC.
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Post time: Jul-31-2025