蒸发气驱与凝析气驱过程组分变化计算模拟及分析

发布时间：2018-03-27 04:54

本文选题：混相驱　切入点：凝析气驱　出处：《油气地质与采收率》2017年04期

【摘要】：为了优化注气驱方案设计,运用混相驱技术提高采收率,基于立方型状态方程和闪蒸计算理论,建立了蒸发气驱和凝析气驱烃类体系相态闪蒸计算模型。运用给定的温度与压力条件、原油组分和注入气组分,模拟多级接触混合过程中油气组分的变化,分析注气混相驱的动态变化,进而定量描述气液两相平衡的动态过程。通过绘制拟三元相图直观展示模拟注气过程中油气组分的变化,以判别注入气能否与地层原油实现混相或达到近混相状态。模拟结果表明:向原油中注入较轻质的气体,蒸发气驱机理主导气驱过程,但由于油气组分不匹配无法最终实现混相;向原油中注入重质组分较多的气体,混相机理复杂,应当是凝析和蒸发双重机理共同作用形成的近混相。建立的模型和编制的模块可以方便地应用于任意油气混相的实例计算,为实际开采提供重要参考。
[Abstract]:In order to optimize the design of gas injection flooding scheme, using miscible flooding technology to improve oil recovery, based on cubic equation of state and flash calculation theory, A calculation model for phase flash of hydrocarbon systems in evaporative gas drive and condensate gas drive is established. The variation of oil and gas components in multistage contact mixing process is simulated by using given temperature and pressure conditions, crude oil components and injected gas components. The dynamic change of gas injection miscible flooding is analyzed, and the dynamic process of gas-liquid two-phase equilibrium is described quantitatively. In order to judge whether the injected gas can be mixed with formation crude oil or to be near miscible, the simulation results show that the evaporative gas drive mechanism dominates the gas drive process by injecting lighter gas into the crude oil. However, the mismatch of oil and gas components can not eventually realize the mismatch of oil and gas, and the injection of gas with more heavy components into crude oil makes the mixing mechanism complex. The model and module can be conveniently applied to the calculation of arbitrary oil-gas miscibility, which provides an important reference for practical exploitation.
【作者单位】：匹兹堡大学斯旺森工程学院;
【分类号】：TE357.45

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