考虑水侵强度的裂缝性水驱气藏物质平衡方法

Material balance method for the fractured waterflooding gas reservoir in case of considering the water invasion strength.

在研究非均质水驱气藏水侵模式和机理的基础上,对气藏物质平衡方程进行深入研究,建立了裂缝性水驱气藏的新型物质平衡方程,引入非均质参数和水侵强度系数,提出了裂缝形成早期水侵速度预测方法。实例分析表明,该方法可正确反映裂缝性非均质有水气藏的开采动态,在核算气藏储量的同时,利用早期试采数据可合理有效地预测水侵速度、估计弹性能量和水侵强度等信息,该方法还可用于确定不同采气速度下的天然水封系数。

Based on analyzing the water invasion mode and mechanism for heterogeneous waterflooding gas reservoir,the material balance equation for the gas reservoir was studied deeply and a new material balance equation for the fractured waterflooding gas reservoir was established.The prediction method of early water invasion velocity was built by the introduction of the heterogeneous parameters and water invasion strength coefficients.Example analysis shows that this method can correctly reflect the production behavior of heterogeneous gas reservoir with water.Using the early production test data,the water invasion velocity, estimated elastic energy and water invasion strength could be predicted reasonably and effectively while checking the gas reservoir reserves.This method can also be applied to recognize the natural water-blocking factor with different gas production velocity.