Review Meeting on the Preliminary Design Results of the Jilin Oilfield CO2 Compression Energy Storage Technology Demonstration Project

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On December 10, the Oil, Gas and New Energy Division of China National Petroleum Corporation held a review meeting on the preliminary design results for the CO2 compression energy storage technology demonstration project at the Jilin Oilfield. During the review process, invited experts, as well as leaders and experts from the Oil and Gas and New Energy Branch and the Jilin Oilfield Branch, examined the project-related materials. As the design unit, the Southwest Branch presented a special report on the preliminary design results of the project, focusing on aspects such as the overall layout of the project construction, the process plan, and the responses to the pre-review comments from the Jilin Oilfield. The experts present were divided into groups for process and general layout, utilities and HSE, and budgeting and economic evaluation, to conduct in-depth discussions on the contents of the preliminary design. Key issues were discussed with the Southwest Branch, which provided detailed explanations for the questions raised. After review, the expert group concluded that the construction scale, overall layout, and process technologies determined in the preliminary design are feasible; the content and depth meet the requirements, and they unanimously agreed to approve the review. For further reading: The Jilin Oilfield CO2 compression energy storage technology demonstration project is the first cross-critical CO2 energy storage project in China. It is a key project under China National Petroleum Corporation’s plan to achieve carbon peak targets in its upstream operations, and it also serves as a model example for the Jilin Oilfield to pursue a green and low-carbon transformation as well as to integrate new energy sources with its oil and gas operations. The project involves the construction of a new CO2 energy storage station, which includes compression energy storage devices, expansion energy release devices, gas storage devices, a heat transfer oil storage and heat exchange system, a hot water storage and heat exchange system, as well as supporting facilities such as interconnection lines, power lines, automatic control systems, water supply and drainage systems, and communication systems. The implementation of this project will establish a complete industrial chain ecosystem for \"carbon dioxide capture, energy storage, oil displacement, and sequestration,\" which can effectively enhance the capacity of Jilin Oil Field to utilize renewable energy sources as well as its overall energy efficiency. It will also provide a reference for diversifying energy storage technology options in China. What is transcritical CO2 energy storage? During off-peak periods in the power grid, carbon dioxide is taken from the low-pressure gas storage tank, compressed using a compressor to reach a supercritical state, and then injected into the dense-phase gas transmission pipeline for use in oil displacement downstream, thereby enabling the transition from gaseous state to supercritical state ； During peak periods of electricity demand, carbon dioxide is extracted from the dense-phase gas pipeline, heated to a supercritical state using hot water and high-temperature heat transfer oil, used for power generation through expansion, and then stored in a low-pressure gas storage tank, thereby achieving a transition from dense-phase to supercritical to gaseous state – a technique that is unique in China.