目前数值模拟无法同时计算CO2在油、气、水相中的分配及水相中溶解CO2对储层物性的影响。针对该问题,应用CO2驱替与埋存一体化数值模拟,通过耦合油气两相闪蒸、CO2在水中的溶解和溶蚀作用,同时模拟CO2在油气水三相中的分配、溶解CO2对储层物性的影响、CO2驱油与埋存全过程。研究结果表明:CO2溶于地层水后形成碳酸溶蚀岩石,导致储层渗透率增加,作用时间越长,溶蚀效果越明显;CO2在水相中的溶解和溶蚀作用对累计产油量和CO2埋存量均有影响,在研究CO2驱替与埋存问题时需要同时考虑溶解和溶蚀作用,才能反映生产实际。对濮城油田沙一下储层进行数值模拟研究,证明了CO2驱替与埋存一体化数值模拟方法准确。该研究对CO2驱油与埋存项目的方案设计和CO2埋存潜力评价具有借鉴和指导作用。
At present, numerical simulations cannot calculate the distribution of CO2 in oil, gas, and water and the effect of CO2 dissolved in water on the physical properties of the reservoir. In response to this problem, the innovative application of the integrated numerical simulation of CO2 displacement and sequestration can simulate the distribution of CO2 in oil, gas and water, the effect of dissolved CO2 on sequestration, and the whole process of CO2 displacement and sequestration on the basis of the coupled oil-gas flash evaporation and the solution and dissolution of CO2 in water. It was found in the study that CO2 dissolved in formation water developed into carbonic acid dissolved rock, leading to an increase in reservoir permeability, and the longer the action duration, the more obvious the dissolution effect; the solution and dissolution of CO2 in the water affected the cumulative oil production and CO2 sequestration. In the study of CO2 displacement and sequestration, it was necessary to consider both the solution and dissolution effects in order to reflect the actual production. The numerical simulation study was conducted in the Lower Sha 1 reservoir in Pucheng Oilfield, and proved that the integrated numerical simulation method of CO2 displacement and sequestration is accurate. This study can become certain reference and guidance for scheme design of CO2 displacement and sequestration project and the evaluation of CO2 sequestration potential.
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