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首页> 外文期刊>Transport in Porous Media >Drainage of Capillary-Trapped Oil by an Immiscible Gas: Impact of Transient and Steady-State Water Displacement on Three-Phase Oil Permeability
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Drainage of Capillary-Trapped Oil by an Immiscible Gas: Impact of Transient and Steady-State Water Displacement on Three-Phase Oil Permeability

机译：不混溶性气体排放的毛细管捕集油：瞬态和稳态注水量对三相油渗透率的影响

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In a previous paper (Dehghanpour et al., Phys Rev E 83:065302, 2011a), we showed that relative permeability of mobilized oil, k_(ro), measured during tertiary gravity drainage, is significantly higher than that of the same oil saturation in other tests where oil is initially a continuous phase. We also showed that tertiary k_(ro) strongly correlates to both water saturation, S_w, water flux (water relative permeability), k_(rw), and the change in water saturation with time, dS_w/d_t. To develop a model and understanding of the enhanced oil transport, identifying which of these parameters (S_w, k_(rw)/, or dS_w/d_t) plays the controlling role is necessary, but in the previous experiments these could not be deconvolved. To answer the remaining question, we conduct specific three-phase displacement experiments in which k_(rw) is controlled by applying a fixed water influx, and S_w develops naturally. We obtain k_(ro) by using the saturation data measured in time and space. The results suggest that steady-state water influx, in contrast to transient water displacement, does not enhance k_(ro). Instead, reducing water influx rate results in excess oil flow. Furthermore, according to our pore scale hydraulic conductivity calculations, viscous coupling and fluid positioning do not sufficiently explain the observed correlation between k_(ro) and S_w. We conclude that tertiary k_(rn) is controlled by the oil mobilization rate, which in turn is linked to the rate of water saturation decrease with time, dS_w/d_t. Finally, we develop a simple model which relates tertiary k_(ro) to transient two-phase gas/water relative permeability.
机译：在以前的论文中（Dehghanpour等人，Phys Rev E 83：065302，2011a），我们表明，在三次重力引流过程中测得的动员油的相对渗透率k_（ro）明显高于相同油饱和度的渗透率。在其他测试中，油最初是连续相。我们还表明，第三级k_（ro）与水饱和度S_w，水通量（水相对渗透率）k_（rw）和水饱和度随时间的变化dS_w / d_t密切相关。为了建立模型并理解提高的石油传输能力，确定其中哪些参数（S_w，k_（rw）/或dS_w / d_t）起控制作用是必要的，但在先前的实验中无法将其分解。为了回答剩下的问题，我们进行了特定的三相位移实验，其中通过施加固定的水流来控制k_（rw），并且S_w自然地发展。我们使用在时间和空间上测得的饱和度数据获得k_（ro）。结果表明，与瞬态水驱替相比，稳态水流入不会提高k_ro。相反，降低水的流入速度会导致过多的油流。此外，根据我们的孔尺度水力传导率计算，粘性耦合和流体定位不能充分解释k_（ro）和S_w之间的相关性。我们得出的结论是，第三级k_（rn）受油动员率控制，后者又与水饱和度随时间的下降率dS_w / d_t相关。最后，我们建立了一个简单的模型，将第三级k_（ro）与瞬态两相气/水相对渗透率联系起来。

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