Abstract:
CO2 pipeline transportation is one of the key links in carbon capture, utilization and storage (CCUS). As China's first demonstration project of CO2 pipeline with supercritical pressure and a length of one hundred kilometers and a capacity of one million tons, the long-distance CO2 pipeline from Qilu Petrochemical to Shengli Oilfield takes digital intelligence as the important technical means to ensure safe pipeline operation maintenance, which has achieved important theoretical innovation and new construction progress. Taking the Qilu Petrochemical–Shengli Oilfield CO2 pipeline as an example, this paper analyzes the challenges, systematically reviews the application of the key technologies and digital intelligence technologies for safe operation maintenance of long-distance pipeline such as low-level mechanism model building and multi-system data integration from the aspects of flow assurance, corrosion prevention & control and leakage monitoring, and finally predicts the development of long-distance CO2 pipeline technologies. The following results are obtained. First, the thermal hydraulic flow model based on CO2 pipeline, the pipeline corrosion rate model and the gas–solid two-phase transfer model in the soil outside the pipeline are established in the mode of "100% digital delivery of engineering construction + multi-element mechanism data driven", and the station–pipeline integrated multi-mechanism fusion digital twin pipeline is constructed. Second, the key technology system for flow assurance of supercritical CO2 pipeline is formed. Third, the corrosion mechanisms inside the supercritical CO2 pipeline are revealed, and the pipeline corrosion prediction model is established. Fourth, the small-hole leakage diffusion model of dense phase CO2 pipeline under supercritical pressure is established, and the digital intelligence warning model of CO2 pipeline leakage is constructed. β… n conclusion, the Qilu Petrochemical–Shengli Oilfield CO2 pipeline has achieved theoretical innovation from aspects of flow assurance, corrosion prevention & control and leakage monitoring under the orientation of digital intelligence construction, which is of important guidance and practical significance for the development of the digital intelligence technologies for CO2 pipelines under the goal of "carbon neutrality". Β© 2024 Natural Gas Industry Journal Agency. All rights reserved.
