Blasingame production decline curve analysis (PDCA) is crucial for extracting natural gas from fractured tight sandstone reservoirs (FTSRs). The natural gas flow in FTSRs is complex due to high-velocity non-Darcy (hvnD) flow, threshold pressure gradient (TPG), and stress sensitivity of reservoirs. These factors pose a challenge in solving nonlinear equations. In this paper, we establish a mathematical model for the flow of natural gas in FTSRs. The fracture is characterized by a hvnD flow coupled using an embedded discrete fracture model (EDFM). The gas flow in the matrix is coupled with the TPG. Stress sensitivity has been considered in both fractures and matrix. The finite volume method (FVM) was employed to discretize and solve the nonlinear equations in the model. The pressure-normalized rate algorithm and gas flow model were used to present a Blasingame production decline curve for fractured horizontal wells in FTSRs. The Blasingame production decline curve can be used to identify natural gas flow regimes, matrix petrophysical properties, and fracture parameters. The effect of the hvnD flow in fractures, the lvnD flow in the matrix (TPG), stress sensitivity, fracture parameters, and production schedule on the Blasingame production decline curve and pressure profile are discussed in detail. This study provides scientific and theoretical support for predicting gas wells performance and the gas production decline law in FTSRs.

中文翻译：

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基于嵌入式离散裂缝模型的Blasingame裂缝性致密砂气井产量递减曲线分析

Blasingame 产量递减曲线分析 (PDCA) 对于从裂缝性致密砂岩储层 (FTSR) 中提取天然气至关重要。由于高速非达西 (hvnD) 流动、启动压力梯度 (TPG) 和储层应力敏感性，FTSR 中的天然气流动非常复杂。这些因素对求解非线性方程提出了挑战。在本文中，我们建立了 FTSR 中天然气流动的数学模型。裂缝的特征是使用嵌入式离散裂缝模型 (EDFM) 耦合的 hvnD 流。基质中的气流与 TPG 耦合。裂缝和基体均考虑了应力敏感性。采用有限体积法（FVM）对模型中的非线性方程进行离散化和求解。使用压力归一化速率算法和气流模型来呈现 FTSR 中压裂水平井的 Blasingame 产量递减曲线。 Blasingame 产量递减曲线可用于识别天然气流动状态、基质岩石物理性质和裂缝参数。详细讨论了裂缝中的 hvnD 流动、基质中的 lvnD 流动 (TPG)、应力敏感性、裂缝参数和生产计划对 Blasingame 产量递减曲线和压力剖面的影响。该研究为预测​​气井动态和FTSR产气量递减规律提供科学和理论支撑。