CCS Sequestration Technology Assessment In China And Experimental Study

Due to the development of human industrialization, the CO2concentration in the atmosphere increased significantly year by year, and the greenhouse effect problem has been a serious threat to the natural environment and human security. In the various emission reduction scheme, CO2capture and storage (CCS) technology can significantly reduce CO2emissions of fossil fuels, and has great potential for development. In various aspects of CCS technology, storage technology is its ultimate goal and the key to safe implementation of CCS.CCS storage technologies include saline aquifer storage technology, oil reservoir storage technology, coal bed storage technology and gas reservoir storage technology. Because China started relatively late in CCS technology, there are both common and specially needed problems. Common problems include storage potential, storage site selection, storage cost, storage technical and storage safety problem. Four kinds of storage technology have their specially needed problem to be solved. For the above two aspects, the corresponding solution and the development direction in the future were proposed.To assess China CCS sequestration technology, this study firstly analyzed the storage potential of four storage technology in China. According to the CO2storage mechanism and CO2solution based physical model proposed by us, we made a detailed calculation of CO2saline aquifers storage potential in Chinese main basins. Then combined with CO2emission source in China, this study analyzed their source and sink matching condition. Finally according to the characteristic and development condition of4storage technologies in China, this study developed the priority scheme of CCS storage technology in China.CO2enhanced oil recovery (CO2-EOR) technology is one of the priority programs of CO2emission reduction, but the study on CO2transport characteristics in the reservoir is not sufficient and basic physical properties of CO2and oil mixture study is currently missing. To solve this problem, this study measured the density of CO2-dodecane mixture using Magnetic Suspension Balance experimental system. Experimental conditions is40-80℃,8-18MPa and CO2mole fraction of0(pure dodecane solution),0.2497and0.5094. Experimental results show that increases linearly with the pressure, and as the CO2concentration increases, the trend is more significant; the mixture solution density increases linearly with the temperature decreases, and as the CO2concentration increases, the trend is more significant; the mixture solution density increases with the concentration of CO2, and as the temperature decreases, the increasing trend is more significant. Finally, based on the experimental data, this study developed a5-parameters empirical model and the absolute average deviation of the model is less than0.01%. Therefore, the model can accurately predict the density changes of CO2-dodecane solution, and this study provides data and theoretical support for EOR technology.