Light nonaqueous phase liquid (LNAPL) flow in in fractured rock is governed by the same physics as porous media, but LNAPL discharge to a well from fractured rock is subject to the unique geometry of the fractures within the rock and the degree of interconnectivity between the factures. Previous conceptualization and definition of drawdown of nonaqueous phase liquids (NAPL) has employed a single drawdown value to represent the entire vertical interval of mobile NAPL. Application of the single drawdown model may result in erroneous calculation of NAPL transmissivity in fractured rock settings. This work illustrates how drawdown in multiphase systems can be variable over the vertical interval of mobile NAPL. In settings with discrete fracture networks, it is clear that consistently applying a single drawdown value will not accurately represent the pressure gradients. This work presents the multiphase head (MH) model, which is proposed as a comprehensive methodology for evaluating NAPL drawdown in fractured rock, and unconsolidated porous media. The MH model utilizes fluid statics and physical principles to accurately represent pressure differences in the formation and convert those into NAPL drawdown for discrete elevations. This first principles approach to describing how drawdown varies with NAPL‐production zone elevations and fluid levels, resulting in a more accurate representation of discharge vs. fluid elevation behavior. Application of the MH model to various scenarios has identified that dissimilar scenarios can represent similar behavior during recovery from a NAPL removal event or baildown test. The resulting understanding improves the selection of representative portions of baildown test data to use in NAPL transmissivity analysis. Proper conceptualization of drawdown in bedrock identifies an alternate analysis method, the Z‐factor, to estimate NAPL transmissivity. The resulting drawdown calculations and transmissivity analysis method result in a comprehensive approach to calculating NAPL transmissivity in both bedrock and unconsolidated porous media.

中文翻译：

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使用Z因子和MH原理在无限制，受限，栖息和破裂的环境中统一NAPL压降和透射率测试

轻质非水相液体（LNAPL）在裂隙岩中的流动受与多孔介质相同的物理学控制，但是LNAPL从裂隙岩排到井中的过程要受岩石内部裂隙独特的几何形状以及裂隙之间的互连程度的影响。工厂。先前非水相液体（NAPL）降落的概念化和定义已采用单个降落值来表示移动NAPL的整个垂直间隔。单一回落模型的应用可能导致在破裂岩石环境中错误计算NAPL透射率。这项工作说明了如何在移动NAPL的垂直间隔内改变多相系统的水位下降。在具有离散裂缝网络的环境中，显然，始终应用单个回落值将无法准确表示压力梯度。这项工作提出了多相水头（MH）模型，该模型被提议为评估裂隙岩石和未固结多孔介质中NAPL降落的综合方法。MH模型利用流体静力学和物理原理来准确表示地层中的压力差，并将其转换为离散高程的NAPL降幅。这是描述下降量如何随NAPL产油区高度和液位变化而变化的第一个基本方法，从而可以更准确地表示出排放量与液位升高行为。MH模型在各种情况下的应用已确定，在从NAPL删除事件或保释测试中恢复期间，不同的情况可以表示相似的行为。由此产生的理解可以改善对NAPL透射率分析中使用的保释测试数据代表性部分的选择。适当地将基岩中的水降落概念化，可以识别出另一种分析方法Z因子，以估算NAPL的透射率。所得的压降计算和透射率分析方法形成了一种综合方法，可以计算基岩和非固结多孔介质中的NAPL透射率。适当地将基岩中的水降落概念化，可以识别出另一种分析方法Z因子，以估算NAPL的透射率。所得的压降计算和透射率分析方法形成了一种综合方法，可以计算基岩和非固结多孔介质中的NAPL透射率。适当地将基岩中的水降落概念化，可以识别出另一种分析方法Z因子，以估算NAPL的透射率。所得的压降计算和透射率分析方法形成了一种综合方法，可以计算基岩和非固结多孔介质中的NAPL透射率。