井间干扰对气井控制储量的影响

在气田开发方案设计和调整中,单井控制储量的计算是其中一项重要的内容。其中压降法是求单井控制储量的一个基本方法,然而现在的压降法求单井控制储量没有考虑井间干扰的影响,造成单井控制储量失真。提出单井控制范围通过井与井之间的分流线来确定,以及用压降法求单井控制储量时应考虑井间干扰对单井控制面积的影响。井间干扰会造成分流线的位置发生改变,这相当于气井的控制范围发生了变化,其单井控制储量也必然改变。单井控制储量不是一个恒定值,在用压降法计算单井控制储量时,不同的直线段对应不同的动态储量。在压力场发生变化期间,压降曲线不再是直线,只有当压力场达到平衡时才会出现直线段。因此,在用压降法求目前单井控制储量时应取最后一段直线来计算。

The Effect on Controlled Reserve of Gas Well Due to Inter-borehole Interference

The calculation of single well controlling reserves is very important in the design and adjustment of the gas reservoir development program.The pressure-drop method is a basic way that can be used to calculate reserve.However,the inter-borehole interference effect was not considered while we calculate the reserves by pressure-drop method.That will result in the distortion of reserves.In this paper,the controlled scope of a well is decided by inter-well diverting stream lines.The inter-well interference can cause the change of diverting stream lines.It means the change of the area,so the reserves also vary.The single well controlled reserve isn’t a constant.When the pressure-drop methods are used,different line corresponds to different reserve.When pressure field is unstable,the pressure-drop curve is no longer linear,and the curve is line only if pressure field reach equilibrium.Therefore,the last line should be used to calculate present reserve when pressure-drop method is adopted.