面积注水井网的选择与调整

面积注水井网生产井的产出能力与注水井的注入能力之比,对合理注水方式的选择有着重要的影响。随肴产出-注入能力比的增加,应适当增加井网的注采井数比。当产出能力显著低于注入能力时,反九点注水井网是最佳的选择;当产出注入-能力比接近0,25时,应选择四点注水井网;当产出能力接近注入能力,选择五点注水井网,可以得到较高的采油速度。给出了合理注采井数比的简便计算公式。指出,中、低渗透油藏由于流度比都小于1,采用反九点注水井网进行开发是不适宜的,并给出了反九点注水井网的几种主要调整方式。

Choice and Adjustment of Pattern Well Networks

The ratio of producers'productivity to injectors'injectivity for areal well pattern can greatly affect the choice of reasonable injection mode.With the increase of productivity-injectivity ratio,the ratio of injection-production wells should be added properly.With productivity much lower than injectivity,inverted nie-spot injection pattern is the optimum selection;with productivity-injectivity ratio approaching 0.25,four-spot pattern will be proper,with productivity close to injectivity,five-spot injection pattern will reach higher production rate.The simple formula for calculation of reasonable ratio of in jection-production wells is presented.It is suggested that with mobility ratio of low permeability reservoir of less than 1,adopting inversed nine-spot injection pattern is improper,and several main adjustment modes for inverted nine-spot injection pattern are introduced in this pater.