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An investigation of different gas injection scenarios as enhanced condensate recovery method in a naturally fractured gas-condensate reservoir

机译：天然裂缝性凝析气藏中不同注气方案作为强化凝析油回收方法的研究

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In gas condensate reservoirs, when the bottom hole pressure falls below the dew point pressure condensates are formed. This causes hydrocarbon liquid saturation around the well bore region. This phenomenon is called condensate blockage or condensate banking. Condensate recovery reduction due to condensate banking near the well bore region is an important problem in gas condensate reservoirs. The common method to prevent the condensate banking is gas cycling (reinjection of produced dry gas) into the reservoir that can contribute to the condensate vaporization, thus increasing the condensate recovery factor. The objective of this study was to find a suitable replacement for gas cycling. For this purpose, an investigation on the effects of injection of different types of gases (CO2, N-2, and C-1) on enhance condensate recovery factor and pressure maintenance were performed. This research was done on one of the Iranian gas condensate reservoirs through a compositional simulator. The two-parameter Peng-Robinson equation of state (EOS) and Lohrenz-Bray-Clark correlation were used to model reservoir fluid properties through regression on the pressure-volume-temperature (PVT) experimental data. A fracture network was distributed over the reservoir, so a dual porosity/dual permeability model was selected for better evaluation of the fracture system. Then, various scenarios of natural depletion and CO2, N-2, C-1, and gas cycling injection were studied. The results showed that CO2 injection scenario being associated with the highest efficiency compared to that of other gases.
机译：在气体冷凝水储层中，当井底压力降至露点以下时，就会形成冷凝水。这导致井眼区域周围的烃类液体饱和。这种现象称为凝结水阻塞或凝结水库。由于井筒区域附近的凝结物堆积而导致的凝结物回收减少是天然气凝结水储层中的重要问题。防止冷凝物堆积的常见方法是将气体循环（产生的干燥气体再注入）到储层中，这可能有助于冷凝物蒸发，从而增加了冷凝物回收系数。这项研究的目的是为气体循环找到合适的替代品。为此，对注入不同类型的气体（CO2，N-2和C-1）对提高凝结水回收率和维持压力的影响进行了研究。这项研究是通过成分模拟器对伊朗的一个天然气凝析气藏进行的。通过对压力-体积-温度（PVT）实验数据进行回归，使用了两参数的Peng-Robinson状态方程（EOS）和Lohrenz-Bray-Clark相关性来建模储层流体特性。裂缝网络分布在储层上方，因此选择双重孔隙度/双重渗透率模型可以更好地评估裂缝系统。然后，研究了自然消耗和CO2，N-2，C-1和气体循环注入的各种情景。结果表明，与其他气体相比，二氧化碳注入情景具有最高的效率。

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