Investigating phase dynamics of reservoir ffuids in CO2 huff-n-puff enhanced oil recovery
本文深入研究了CO2 吞吐（huff-n-puff）过程中储层流体的动态相态行为，这是提高石油采收率（EOR）的一个关键方面。利用数值模拟，研究了四个关键流体相态区域的形成和演变，包括一个混相油区和两个侧翼的混相凝析气区，揭示了CO2与储层流体之间复杂的相互作用。研究方法系统地处理了这些区域的空间和时间动态，为理解它们的演变提供了一个框架。研究深入探讨了流体属性和相态状态之间的复杂相互作用，揭示了组分迁移在影响相态行为中的基本作用。这一探索不仅揭示了CO2 吞吐过程中驱动流体动力学的机制，也强调了提高采收策略的更广泛意义。
CMG软件应用情况：
本研究基于中国某油田特定断块油藏的物理属性，构建了数值油藏模拟的地质模型。为了全面研究了CO2 吞吐过程中复杂的相态行为变化，采用了CMG-GEM组分和非常规模拟器。最初，使用WinProp流体属性表征工具，拟合了G64-38井流的恒组成膨胀实验结果和CO2注入油膨胀实验，从而确定了储层流体伪组分的特征参数和二元交互作用系数。这些值随后被整合到油藏数值模拟中。此外，还考虑了油相和气相中每个组分的分子扩散。
A B S T R A C T
This investigation delves into the dynamic phase behavior of reservoir ffuids during CO2 huff-n-puff processes, a critical aspect of enhanced oil recovery. Utilizing numerical simulations, the study examines the formation and evolution of four key ffuid phase zones, including a miscible-phase oil zone and two ffanking miscible-phase condensate gas zones, shedding light on the intricate interactions between CO2 and reservoir ffuids. The research methodically addresses the spatial and temporal dynamics of these zones, providing a framework for understanding their evolution. It delves into the complex interplay of ffuid properties and phase states, revealing the fundamental role of component migration in inffuencing phase behavior. This exploration not only uncovers the mechanisms driving ffuid dynamics in the CO2 huff-n-puff process but also emphasizes the broader implications for improving oil recovery strategies. By offering a comprehensive view of the factors governing phase behavior, the study contributes to the ffeld’s knowledge, suggesting avenues for future research and practical application in enhancing oil recovery efffciency.
作者单位：
- a. 冀东油田
- b. 中国石油大学（北京）