Objective To support achieving the"dual carbon"goals by clarifying the adaptability and economic feasibility of CO2 pipeline transportation under different phases.Methods This study is set against research on key CCUS-EGR technologies in the carbonate gas reservoirs of PetroChina Southwest Oil and Gas Field.We optimized and established economic estimation models for CO2 pipeline transportation in three phases:gas phase,liquid phase,and supercritical phase.The impacts of flow rate,transportation distance,and transportation volume on the relative total cost were analyzed.Results The findings indicate that:first,the minimum transportation costs follow the order:gas phase pipeline>liquid phase pipeline>supercritical pipeline;second,the economical flow rate ranges are 3.0-4.0 m/s for gas phase,1.0-1.8 m/s for liquid phase,and 2.0-2.4 m/s for supercritical phase;third,the relative total cost increases with transportation distance at different conveying distances;fourth,the relative total cost also increases with transportation volume at different throughput,where the transportation cost for pipe diameters above DN200 rises slowly with volume,whereas the cost for DN100 diameter pipes varies significantly with volume.Conclusion By establishing an economic estimation model for CO2 pipeline transportation and analyzing its economic feasibility under different phases,this study provides a solid basis and reference for constructing CO2 pipeline transportation projects.
CCUSCO2 pipelinepipeline process calculationphase stateeconomic analysis
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