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在深层气田开发过程中,发现了丰富的CO2资源。准确识别CO2混合气相态对于气井的动态分析、混合气准确计量等具有重要意义,有助于提高CO2气井的整体开采效果。但由于CO2混合气相态受温度、压力的影响较大,且不同程度含有烃类气体,这使得CO2气井相态图由单一纯CO2的饱和蒸汽压线变成了混合气体的包络线,气井的相态描述变的复杂化。因此开展CO2气井井筒相态剖析,弄清了CO2混合气体的超临界相、气液两相、纯汽相、过冷液相在井筒分布规律,充分发挥其指导实际生产的作用。
During the development of deep gas fields, abundant CO2 resources were discovered. Accurately identifying the phase state of CO2 mixture is of great significance to the dynamic analysis of the gas well and the accurate measurement of the mixed gas, which helps to improve the overall production of the CO2 gas well. However, the CO2 gas phase state is greatly affected by temperature and pressure, and contains hydrocarbon gas to some extent. This makes CO2 gas well phase diagram change from the saturated steam pressure line of a single pure CO2 to the envelope of gas mixture, The phase description of the complex becomes more complicated. Therefore, the phase analysis of CO2 gas well is carried out, and the law of distribution of supercritical phase, gas-liquid two-phase, pure vapor phase and supercooled liquid phase in the wellbore of CO2 mixed gas is clarified and its role in guiding practical production is given full play.