We can learn from above that the study of material balance method during gas injection flooding is very important.

因此，研究注气开采过程中的物质平衡方程序具有十分重要的意义。

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How to calculate the water invasion rate correctly while we study the performance and calculate the dynamic reserves of the gas reservoir with material balance equation is still a difficulty for long.

在利用物质平衡方程计算水驱气藏地质储量、研究气藏动态时，水侵量的计算一直是个难点。

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