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An investigation on phase behaviors and displacement mechanisms of gas injection in gas condensate reservoir

机译：气体冷凝水储层气体注射液相行为及位移机理研究

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摘要

Cyclic gas injection into gas condensate reservoir is regarded as an effective development method to enhance condensate oil recovery. The aim of this work is to investigate the phase behavior and displacement mechanism of gas injection in gas condensate reservoir. Based on the equation of state and the phase equilibrium theory, the phase behavior of condensate oil in the formation mixed with various gas (CO2, N-2, CH4, C2H6 and re-injected gas) has been analyzed. By calculating the Minimum Miscible Pressure (MMP), the miscibility of various gas was discussed and the effect of intermediate component in the re-injected gas on miscibility was evaluated. Moreover, a series of numerical simulations modeling the five-spot well network were conducted to investigate the displacement mechanism of gas injection using a compositional simulator. The results show that the injection of N-2, CH4 and re-injected gas can raise the bubble point pressure of condensate oil and is conductive to the re-evaporation of condensate oil; whereas, injecting C2H6 or CO2 have little effect on it. The miscibility of reinjected gas increases with the intermediate component fraction. It is observed that at the reservoir pressure of 130 bar and reservoir temperature of 366.5 K, N-2 and CH4 can evaporate the condensate oil in the formation by the function of gas extraction, with no miscibility; nevertheless, CO2 and C2H6 can be miscible with condensate oil to enhance the condensate recovery. For the cyclic gas injection, the higher the mole fraction of intermediate component, the more likely the miscibility occurs.
机译：将循环气体注入气体冷凝水储层被认为是增强凝液油回收的有效开发方法。这项工作的目的是探讨气体冷凝水储层气体注射的相行为和位移机理。基于状态等式和相平衡理论，已经分析了与各种气体（CO 2，N-2，CH4，C 2 H 6和再注入气体）混合的形成中缩合物油的相行为。通过计算最小混溶性压力（MMP），讨论了各种气体的混溶性，评价了中间组分在重新注射气体上的混溶性的影响。此外，进行了一系列模拟五点井网网络的数值模拟，以研究使用组成模拟器的气体喷射的位移机理。结果表明，注射N-2，CH4和重新注射气体可以提高冷凝水油的气泡点压力，并导致冷凝水油的再蒸发;而注射C2H6或CO2对其影响很小。再喷射气体的混溶性随着中间组分馏分增加。观察到，在130巴的储层压力和366.5k的储层压力下，N-2和CH4可以通过气体提取的功能蒸发缩合物油，没有混溶;然而，CO 2和C2H6可以与缩合油混溶，以增强冷凝物恢复。对于循环气体注入，中间组分的摩尔分数越高，发生的混杂性越多。

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  • 来源
    《Fuel》 |2020年第may15期|117373.1-117373.10|共10页
  • 作者

    Zhang Angang; Fan Zifei; Zhao Lun;

  • 作者单位

    PetroChina Res Inst Petr Explorat & Dev 20 Xueyuan Rd Beijing 100083 Peoples R China;

    PetroChina Res Inst Petr Explorat & Dev 20 Xueyuan Rd Beijing 100083 Peoples R China;

    PetroChina Res Inst Petr Explorat & Dev 20 Xueyuan Rd Beijing 100083 Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Gas condensate reservoir; Phase behavior; Displacement mechanism; Gas injection; Evaporation; Miscibility;

    机译：气体冷凝水储层;相行为;位移机制;气体注射;蒸发;混溶性;

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