易挥发性原油定容衰竭非平衡相态研究

The Non-equilibrium Phase Behavior Study of Volatile Oil about Constant Volume Depletion

针对易挥发性原油进行非平衡相态研究。系统相态的转变需要一定时间,在平衡状态转变这段时间内系统就会处于非平衡状态。挥发性油藏非平衡定容衰竭实验证明,当外界压力变化速度超过相变速度时,挥发性流体中的中间烃类组分可能来不及挥发至气相而残留在剩余油液相之中,使得剩余油收缩率降低。

This thesis focuses on the study of non- equilibrium phase behavior of volatile oil. The system will be in the non- equilibrium state when it transits from one equilibrium state to the next state. The constant volume depletion experiments of volatile oil reservoir show that when the outside pressure changes at a faster rate than that of phase change speed,intermediate hydrocarbon components in the volatile fluid may remain in residual oil liquid phase because they do not have enough time to volatilize to the gas phase; therefore,the shrinkage rate of remaining oil volume would decrease.