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低渗、致密砂岩气藏已逐渐成为勘探开发的热点,其储层特征和高含水特点导致了渗流机理不同于常规气藏,主要表现为:在近井区呈现为高速非达西渗流形式;在远井区由于启动压力梯度的影响呈现低速非达西渗流形式。因此,采用常规达西渗流条件下建立的产能方程评价单井产能必然存在误差。目前针对非线性渗流机理对开发的影响已有深入研究,但建立的模型大多是复杂不稳定渗流模型,现场实际应用不方便。为了弥补现有气藏工程理论的不足,从基本渗流方程出发,建立了考虑低速非达西渗流机理的直井稳态产能方程,与实际井测试数据进行了对比,并深入分析了低速非达西渗流机理在不同条件下对产能的影响程度。
Low permeability and tight sandstone gas reservoirs have gradually become hot spots for exploration and development. Their reservoir characteristics and high water cut cause the seepage mechanism different from that of conventional gas reservoirs. The main features are as follows: In the far zone, low-velocity non-Darcy seepage forms appear due to the influence of the starting pressure gradient. Therefore, it is inevitable to evaluate the single well productivity using the production equation established under the conventional Darcy flow. At present, the influence of nonlinear seepage mechanism on development has been studied deeply, but most of the established models are complex and unsteady seepage models, which are inconvenient in practical application. In order to make up for the deficiencies of existing gas reservoir engineering theory, the steady-state productivity equation of vertical well taking into account the low-velocity non-Darcy flow mechanism is established based on the basic seepage equation and compared with the actual well test data. In addition, Influence of Seepage Mechanism on Production Capacity under Different Conditions.