利用范函数法确定水驱合理注水量

Use of φ Function to Determine Water Injection Rate

注水开发是目前油气田开发中保持地层压力,提高油气田产量的主要方法.注入到地层中的合理水量直接影响着油田开发效果.为确定合理注水量,本文根据Φ函数理论建立了一套用于合理注水量确定的计算方法.Φ函数又称范函数(即水相分流量关于的导数)是累积注入孔隙体积倍数的倒数.累积注入孔隙体积倍数主要受到孔隙度,含油面积,有效厚度、含水率、含水上升,累注水等因素的影响,在考虑这些因素的影响之后所建立的方法能够保证所确定的注水量为合理注水量.

Waterftooding development is currently the main technique means to maintain reservoir pressure and to raise production of oil-gas, field. A calculation method is estab- lished based on Ф function for determining the reasonable water injection rate in formation, which gives direct impact on oilfield development effectiveness. Ф function（the derivative of water fractional flow with respect to water saturation）is the reciprocal of PV. Oil-bearing area, effective thickness, water ratio, water Cut rising speed, Cumulative water injection af- fect pv .Given all this, the proposed method can ensure the rationality of water injection rate in the formation.