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Effect of Nanopore Confinement on Fluid Phase Behavior and Production Performance in Shale Oil Reservoir
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2021-01-14 , DOI: 10.1021/acs.iecr.0c05814 Zhaojie Song 1 , Yilei Song 1 , Jia Guo 1 , Dong Feng 1 , Jiangbo Dong 1
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2021-01-14 , DOI: 10.1021/acs.iecr.0c05814 Zhaojie Song 1 , Yilei Song 1 , Jia Guo 1 , Dong Feng 1 , Jiangbo Dong 1
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The confinement effects including capillarity and adsorption play a significant role in phase behavior and transport of shale fluids. The effect of capillary pressure has been widely studied and is fully understood. However, the investigation of the adsorption effect on reservoir fluid properties and production performance is still lacking. In this work, an efficient model is proposed to fill this gap and investigate the phase behavior and well performance in the Bakken shale oil reservoir. First, an improved phase equilibrium model is developed based on an adsorption-dependent Peng–Robinson equation of state and a modified Young–Laplace equation. The effect of adsorption and adsorption induced critical property shifts in nature is considered. Second, the phase equilibrium model is used to calculate and compare the black-oil properties of the Bakken oil under different pressures and confinement conditions. Finally, the fluid properties results are combined with the reservoir simulator to assess the confinement effects on the well performance of the Bakken shale reservoir. The result indicates that fluid adsorption makes a more significant contribution to the suppressed bubble point pressure than capillarity. The change in the black-oil properties shows that the confinement effect exhibits a great impact on the physical properties of the oil phase including solution gas–oil ratio, oil formation volume factor, and oil viscosity, but presents a small impact on the physical properties of the gas phase including gas formation volume factor and gas viscosity. In terms of production performance, the presence of confinement increases the cumulative oil production, first increasing, and then decreasing cumulative gas production, which leads to a flatter producing gas–oil ratio. Overall, the effect of adsorption is more significant under high-pressure conditions, and the effect of capillary pressure is more significant under low-pressure conditions.
中文翻译：
纳米孔隙限制对页岩油藏液相行为和生产性能的影响
限制作用包括毛细作用和吸附作用在页岩流体的相行为和传输中起着重要作用。毛细压力的影响已被广泛研究并得到充分理解。然而，仍缺乏对储层流体性质和生产性能的吸附作用的研究。在这项工作中，提出了一个有效的模型来填补这一空白，并研究巴肯页岩油藏的相行为和油井性能。首先，基于依赖于吸附的Peng-Robinson状态方程和修正的Young-Laplace方程，开发了一种改进的相平衡模型。考虑了吸附和吸附引起的临界性质改变的影响。第二，相平衡模型用于计算和比较巴肯石油在不同压力和约束条件下的黑油特性。最后，将流体性质结果与储层模拟器结合起来，以评估对Bakken页岩储层井眼性能的限制作用。结果表明，与毛细作用相比，流体吸附对抑制泡点压力的贡献更大。黑油性质的变化表明，封闭作用对油相的物理性质（包括溶液气-油比，成油体积因子和油粘度）有很大的影响，但对物理性质的影响很小。气相的组成包括气体形成体积因子和气体粘度。在生产性能方面，限制条件的存在会增加累计产油量，先增加然后减少累计产气量，这会导致生产气油比更加平坦。总体而言，在高压条件下吸附效果更显着，而在低压条件下毛细管压力的效果更显着。
更新日期：2021-01-27
中文翻译：
纳米孔隙限制对页岩油藏液相行为和生产性能的影响
限制作用包括毛细作用和吸附作用在页岩流体的相行为和传输中起着重要作用。毛细压力的影响已被广泛研究并得到充分理解。然而，仍缺乏对储层流体性质和生产性能的吸附作用的研究。在这项工作中，提出了一个有效的模型来填补这一空白，并研究巴肯页岩油藏的相行为和油井性能。首先，基于依赖于吸附的Peng-Robinson状态方程和修正的Young-Laplace方程，开发了一种改进的相平衡模型。考虑了吸附和吸附引起的临界性质改变的影响。第二，相平衡模型用于计算和比较巴肯石油在不同压力和约束条件下的黑油特性。最后，将流体性质结果与储层模拟器结合起来，以评估对Bakken页岩储层井眼性能的限制作用。结果表明，与毛细作用相比，流体吸附对抑制泡点压力的贡献更大。黑油性质的变化表明，封闭作用对油相的物理性质（包括溶液气-油比，成油体积因子和油粘度）有很大的影响，但对物理性质的影响很小。气相的组成包括气体形成体积因子和气体粘度。在生产性能方面，限制条件的存在会增加累计产油量，先增加然后减少累计产气量，这会导致生产气油比更加平坦。总体而言，在高压条件下吸附效果更显着，而在低压条件下毛细管压力的效果更显着。
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