Naturally fractured reservoirs (NFR) represent an important percentage of worldwide hydrocarbon reserves and production. The performance of naturally fractured gas condensate reservoirs would be more complicated regarding both rock and fluid effects. In contrast to the dual-porosity model, dual-porosity/dual-permeability (dual-permeability) model is considered as a modified model, in which flow to the wellbore occurs through both matrix and fracture systems. Fluid flow in gas condensate reservoirs usually demonstrates intricate flow behavior when the flowing bottom-hole pressure falls below the dew point. Accordingly, different regions with different characteristics are formed within the reservoir. These regions can be recognized by pressure transient analysis. Consequently, distinguishing between reservoir effects and fluid effects is challenging in these specific reservoirs and needs numerical simulation. The main objective of this paper is to examine the effect of condensate banking on the pressure behavior of lean and rich gas condensate NFRs through a simulation approach. Subsequently, evaluation of early-time characteristics of the pressure transient data is provided through a single well compositional simulation model. Then, drawdown, buildup, and multirate tests are conducted to establish the condition in which the flowing bottom-hole pressure drops below the dew point causing retrograde condensation. The simulation results are confirmed through well test analysis in both Iranian naturally fractured rich and lean gas condensate fields. Interpretations of simulation analysis revealed that the richer gas is more prone to condensation. When the pressure drops below the dew point, the pressure derivative curves in the rich gas system encounter a more shift to the right, and the trough becomes more pronounced as compared to the lean one.

中文翻译：

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天然裂缝性天然气凝析气藏双渗透模型中凝析油漏失效应的数值试井分析：以伊朗南部为例

天然裂缝性储层（NFR）占全球油气储量和产量的重要比例。就岩石和流体影响而言，天然裂缝性凝析气藏的性能将更加复杂。与双重孔隙度模型相反，双重孔隙度/双重渗透率（双重渗透率）模型被认为是一种改进的模型，在该模型中，流向井眼的水流既通过基质系统又通过裂缝系统发生。当流动的井底压力降至露点以下时，凝析气藏中的流体流动通常表现出复杂的流动行为。因此，在容器内形成具有不同特性的不同区域。这些区域可以通过压力瞬态分析来识别。最后，在这些特定的油藏中，区分油藏效应和流体效应是一项挑战，需要进行数值模拟。本文的主要目的是通过模拟方法研究凝结水库对稀，富凝析气NFR压力行为的影响。随后，通过单井组成模拟模型提供了压力瞬变数据的早期特征的评估。然后，进行压降，堆积和多速率测试，以建立流动的井底压力降至露点以下而引起逆行凝结的条件。通过伊朗自然裂缝的富气和贫气凝析气田的试井分析，证实了模拟结果。对模拟分析的解释表明，较丰富的气体更易于冷凝。当压力降到露点以下时，富气系统中的压力导数曲线向右移动更多，与贫气相比，波谷变得更明显。