废弃气藏CO2地质封存机制及运移规律研究

项目名称： 废弃气藏CO2地质封存机制及运移规律研究

项目编号： No.51274173

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 矿业工程

项目作者： 汤勇

作者单位： 西南石油大学

项目金额： 80万元

中文摘要： CO2注入废弃气藏是实现温室气体减排和提高天然气采收率双赢的有效途径。而我国还未开展该方面的研究。本项目拟采用物理模拟和数学模拟相结合的方法进行研究。首先利用加拿大进口的DBR-PVT仪开展不同组成的CO2-CH4-盐水体系在高温高压条件下的相态特征、CO2混合气体在地层水中的溶解规律研究。利用岩心驱替实验研究毛管压力产生的束缚气封存潜力；利用高压反应釜测试CO2与不同岩石矿物之间化学反应和作用机理；利用岩心实验研究CO2注入后盐岩溶解和沉积规律及其对渗流能力的影响；实验研究CO2在天然气藏中的扩散运移规律。在实验测试基础上，建立高温高压CO2-CH4-地层水相平衡热力学理论模型、CO2流体-岩石矿化反应模型和CO2扩散模型，在此基础上，建立考虑盐岩溶解和沉积以及CO2扩散耦合的多相渗流理论模型。该研究成果对于发展物理化学渗流、揭示CO2在废弃气藏中地质封存机理和运移规律具有重要意义。

中文关键词： 枯竭气藏；CO2地质埋存；CO2溶解度；CO2-岩石-地层水相互作业；埋存机理

英文摘要： As energy needs around the globe are rising, simultaneously with concerns about the environmental impact of human activities, Carbon Capture and Storage has been put forward as a way to mitigate the detrimental effects of fossil fuels as an energy source.CO2 injection in the abandonment gas reservoir is effective way to come true the Greenhouse gas emissions reduction and improve the recovery factor of gas reservoir, but there are no researches on it in China are proposed. We will use the combination of physical and mathematical modeling to research. Phase behavior of different CO2-CH4-brine systems under high temperature and pressure, dissolution rule of CO2 miscellaneous gas in formation water are investigated using imported DBR-PVT tool from Canada at first. Core flooding experiment is used to research the potential of cocooning of included gas produced by capillary pressure. The chemical reaction and active mechanism between CO2 and different rocks are tested with high pressure re-actor. Core experiment is proposed to study the effect of rock salt fusion, deposition law and permeability after CO2 injection. The influence law of CO2 diffusion and movement in gas reservoir is studied. Phase equilibrium thermodynamic model for CO2-CH4-water system under high temperature and pressure, CO2 fluid-rock mineralizati

英文关键词： Depleted gas reservoirs；CO2 geo-sequestration；Solubility of carbon dioxide；CO2 /rock /fluid interaction；Sequestration mechanism