For reservoirs containing fluids with complex flow characteristics, the calculation of multiphase pseudo-pressure plays a significant role in production data analysis (PDA) practices. In the case of retrograde gas reservoirs/gas condensate reservoirs under multiphase flow conditions, the lack of a reliable and complete saturation-pressure (S-p) relationship presents a significant challenge in obtaining the appropriate value of multiphase pseudo-pressure. Gas condensate reservoirs are one of the viable and lower-emission hydrocarbon sources for meeting the ever-increasing global energy demand. The economic value of producing gas condensates has inspired numerous research into employing innovative production techniques in developing gas condensate fields. Hence, this study proposes an improved saturation-pressure relationship alongside a Fractional Phase Mobility (FPM) criterion to mitigate potential errors in the multiphase pseudo-pressure calculation for gas condensate reservoirs under boundary-dominated flow. This work introduces an improved S-p relationship derived using a Rescaled Constant Volume Depletion (CVD) method for estimating multiphase pseudo-pressures. To demonstrate the effectiveness of the proposed approach, we provide direct comparisons with the Classical CVD method and numerical simulation results for multiple gas condensate cases subjected to constant and variable bottomhole pressure (BHP) schedules. In contrast to the classical approach, the Rescaled CVD method consistently delivers superior performance for multiphase pseudo-pressure estimations across all cases, thus supporting its potential as a robust and accurate approach for gas condensate reservoir modeling.

中文翻译：

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边界控制流下逆行气藏开采改进的饱和压力关系和多相假压力计算

对于含有复杂流动特征流体的油藏，多相拟压力的计算在生产数据分析（PDA）实践中起着重要作用。对于多相流条件下的逆行气藏/凝析气藏，缺乏可靠且完整的饱和压力（Sp）关系对获得适当的多相拟压力值提出了重大挑战。凝析气藏是满足不断增长的全球能源需求的可行且低排放的碳氢化合物来源之一。生产凝析油的经济价值激发了人们对采用创新生产技术开发凝析油田的大量研究。因此，本研究提出了一种改进的饱和压力关系以及分数相迁移率（FPM）准则，以减少边界主导流下凝析气藏多相伪压力计算中的潜在误差。这项工作引入了一种改进的 Sp 关系，该关系是使用重新调整的恒定体积消耗 (CVD) 方法导出的，用于估计多相伪压力。为了证明所提出方法的有效性，我们提供了与经典 CVD 方法的直接比较以及针对恒定和可变井底压力 (BHP) 方案的多种凝析油情况的数值模拟结果。与经典方法相比，Rescaled CVD 方法在所有情况下始终为多相伪压力估计提供卓越的性能，从而支持其作为凝析气藏建模的强大而准确的方法的潜力。