The first profitable pilot experimental platform for the exploitation of shale oil in the Dagang Oilfield, the No. 5 Platform in Cangdong Sag, was put into operation recently. The platform, comprising nine oil wells, has a daily production capacity of around 280 tons and an annual production capacity of 100,000 metric tons. This marks the operation of China's first 100,000-ton-level demonstration platform for the efficient exploitation of continental shale oil in the Dagang Oilfield.
Through a continuous analysis of the 500-meter shale core of its Guan 108-8 well, as well as years of basic research in tackling key technical problems, such as the evaluation and selection of shale oil layers in faulted basins and fracturing for enhanced oil recovery (EOR), Dagang Oilfield has achieved initial breakthroughs in the enrichment theory and evaluation of shale oil.
Dagang Oilfield has innovated a management model of "platform leader in charge, market-oriented operation, and digitalized intelligent control", and developed the key technology of CO2 pre-pad energized fracturing for EOR. As a result, it has achieved a significant increase in the production of pilot test wells while realizing a CO2 sequestrating capacity of 13,000 tons, which has innovated technologies for the efficient development of shale oil with negative carbon emissions.
The five new wells deployed in the No. 5 Platform in Cangdong Sag produced a cumulative 12,000 tons of oil in a three-month trial production, and it is predicted that the annual production of a single well can exceed 10,000 tons once operational, with a cumulative oil production of up to 41,000 tons over 15 years, providing a "Dagang model" for China's efficient development of onshore shale oil.
Dagang Oilfield has abundant shale oil. Relying on the China National Petroleum Corporation's major technology project, Dagang Oilfield has accelerated the innovation of shale oil enrichment theory and the integration of related technologies. In 2018, it achieved a breakthrough in developing a horizontal well in the second section of the Cangdong sag, and became the first to industrialize shale oil exploitation in Bohai Bay. It later achieved success in the sections of the Qikou sag, achieving breakthroughs in the three main shale oil formations in the Huanghua sag, and breaking new ground in major resource replacement in the old oilfields in Bohai Bay.
(Executive editor: Xie Yunxiao)
