运用采气实用计算理论，建立了注气井节点系统分析数学模型。

According to the practical computation theory of the gas production, the mathematical model for the nodal system analysis of the gas injection Wells is established.

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利用该模型可以对火烧油层注气井试井压降曲线进行解释，并求解流度比、扩散比以及各区的波及半径等参数。

With this model, the pressure drop curve of well testing is interpreted, and mobility ratio, diffusion ratio, sweep radius of each area and some other parameters are solved.

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本文所建立的数学模型可以进行行列式注气井网开发指标的预测，也可以推广应用于五点法和其它面积井网注气开发指标计算。

The new maths model can be apply to forecasting of line drive gas injection, and can be popularized to five-spot and other areal well pattern.

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