凝析气藏型储气库多周期注采过程中流体相态变化特征
PETROLEUM EXPLORATION AND DEVELOPMENT（2021）
Abstract
基于储气库与气藏开采方式和运行过程的差异性,建立了凝析气藏型储气库多周期注采过程相平衡测试实验流程和多周期注采相平衡理论模拟模型,研究凝析气藏型储气库多周期注采过程采出流体和剩余流体相态特征.以实例凝析气藏型储气库为对象,通过多周期注采实验和相平衡理论模拟,开展多周期注采过程中采出流体和剩余流体组分、剩余流体相态、反凝析油饱和度和凝析油采出程度变化规律研究.研究表明,注入气可大幅度提高储气库凝析油采出程度,经过5个周期的注采凝析油采收率提高了42％;注入气对储气库中凝析油的蒸发抽提作用明显,前两个周期作用最为显著;地层凝析油饱和度随注采周期数增加而减小,多周期注采后剩余凝析油饱和度几乎为0;多周期注采后库容增加约7.5％,第5周期累计注气量较第1周期增加约25％.
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Key words
condensate gas reservoir, gas storage, phase characteristics, multi-cycles of injection-production, FOR
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