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采用CO2作为天然气地下储气库的垫层气,对于减少建库成本,节约资金,实现碳的有效地质埋存具有重要的战略意义与社会意义。基于文献调研,对CO2与天然气的物理性质、作垫层气的CO2与工作气的混气机理、CO2作垫层气的储气库的渗流扩散耦合问题及最优运行控制方式的研究现状进行总结,并对其发展前景作了展望,提出了今后研究的重点、难点,包括:1实验研究CO2、地层水、储层岩石相互作用机理,混气区变化特征及气-气互驱渗流特征;2建立考虑CO2及天然气混合的吸附、扩散、对流三维气-气驱动及气-液流动的综合模型,补充并完善目前国际上流行的商品化数值模拟软件对以CO2作垫层气的储气库运行的适应性;3研究多次注采过程中气库的库容变化规律,优化气库运行控制,保证气库安全高效运行。
The use of CO2 as the cushion gas in the underground gas storage of natural gas has important strategic and social significance for reducing the cost of building a reservoir, saving funds and realizing effective geological storage of carbon. Based on the literature review, the current research on the physical properties of CO2 and natural gas, the gas mixing mechanism of gas cushion gas and working gas, the seepage and diffusion coupling of gas reservoir with gas cushion and optimal operation control mode Summarize and prospect its development prospect, put forward the key points and difficulties in the future research, including: 1 Experimental study CO2, formation water, reservoir rock interaction mechanism, mixed zone variation characteristics and gas- ; 2 to establish a comprehensive model of adsorption-diffusion, convection three-dimensional gas-gas drive and gas-liquid flow considering CO2 and natural gas mixture to supplement and improve the current global commercial numerical simulation software to CO2 as cushion gas storage The adaptability of the operation of the gas reservoir; 3 Research on the law of the change of the storage capacity of the gas reservoir in the process of multiple injection and production, optimize the operation and control of the gas reservoir to ensure the safe and efficient operation of the gas reservoir.