On July 22, CNOOC announced that Phase I of the Bohai Kenli 10-2 oilfield cluster development project had officially been put into production, marking the transition of China’s largest offshore shallow lithologic oilfield into the production stage and carrying great significance for safeguarding national energy security.
Located in the southern waters of the Bohai Sea, the oilfield has an average water depth of about 20 meters and proven geological reserves of more than 100 million tons. It is the first shallow, 100-million-ton-class lithologic oilfield in the sag zones of the Bohai Bay Basin. The project will be developed in two phases. Relying on existing facilities, Phase I includes the construction of one central processing platform and two wellhead platforms, with 79 development wells planned to be brought on stream and a peak daily production of about 3,000 tons of oil equivalent. Its reservoir is the first “branching heavy-oil reservoir” to be developed offshore in China, with reserves that are dispersed, narrow, thin, and heterogeneous. The combination of a branching reservoir and heavy-oil thermal recovery is rare both domestically and internationally.
The research team has overcome technical challenges and established a development technology system for complex heavy-oil reservoirs, innovatively adopting a combined development mode of “conventional water injection + steam huff and puff + steam flooding.” The central processing platform is equipped with two production systems, making it the most complex process platform in Bohai and the first large-scale heavy-oil thermal recovery platform in the southern area. In the drilling and completion stages, innovative operation models have increased the reservoir penetration rate by more than 30%. Breakthroughs in extended-reach well technology are helping Bohai Oilfield move toward its target of 40 million tons of total output by 2025.
- Author: Baihua News Center
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