不同温压条件下泥质粉砂岩二氧化碳突破压的试验研究

发布时间：2018-03-20 05:35

  本文选题：盖层　切入点：密封性　出处：《岩土力学》2014年01期 　论文类型：期刊论文

【摘要】：CO2突破压是CO2地质封存盖层密封性和安全性评价的关键指标之一,盖层CO2突破压试验技术也是评价盖层密封性的关键技术之一。国内外学者已经对不同盖层岩样的CO2突破压开展了较为系统的试验研究,但还未对不同温度和压力条件下的CO2突破压变化规律进行研究。在调研现有CO2突破压试验方法和设备的基础上,研制了集成分步法、连续法、脉冲法和驱替法等多种突破压测量方法的CO2突破压试验装置,具有广泛的适用范围。采用该试验装置对四川盆地内须家河组泥质粉砂岩薄弱盖层开展了突破压试验研究,研究40~70℃和10~30 MPa温压范围内超临界CO2突破压的变化规律。试验拟合结果显示:在所研究的温压范围内,CO2突破压随CO2压力升高而降低;随CO2温度上升而上升。试验结果与基于表面张力的理论结果趋势吻合较好,但存在一定的差异;两者之间的差异可能是受CO2-水接触角变化、砂岩孔隙结构非均质性以及试验方法的影响。
[Abstract]:CO2 breakthrough pressure is one of the key indexes to evaluate the sealing and safety of CO2 geological seal. The CO2 breakthrough pressure test technology of caprock is also one of the key techniques to evaluate the sealing property of caprock. Domestic and foreign scholars have carried out systematic experimental research on CO2 breakthrough pressure of different caprock rock samples. However, the variation of CO2 breakthrough pressure under different temperature and pressure conditions has not been studied. Based on the investigation of existing CO2 breakthrough pressure test methods and equipment, the integrated step method and continuous method are developed. The CO2 breakthrough pressure test device of many kinds of breakthrough pressure measurement methods, such as pulse method and displacement method, has a wide range of application. A breakthrough pressure test study has been carried out on the shaly silty sandstone weak caprock of Xujiahe formation in Sichuan Basin. The variation of breakthrough pressure of supercritical CO2 in the range of 4070 鈩，

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