水驱合理注水强度界限研究

Limit of Reasonable Water Injection Intensity in Water Flooding

针对实验区的油层非均质性,层间动用差异明显的特点,采用灰色关联分析法计算各影响因素(本井厚度、连通厚度、连通方向数、含油饱和度、井组含水率、含水上升速度)与井组日注水量的灰色关联度,通过关联度大小来定量判断各影响因素对井组日注水量的影响程度,推导出与注水强度相关的理论公式,结合现场实际情况进行限制,将实验区注水量合理劈分到井组,进一步劈分到层段,并层层进行约束,得到各类油层合理注水强度,将各层系注水强度分析、归纳,得到实验区各层系的合理注水强度范围。通过合理匹配注水强度,可以实现各油层均匀驱替,保持区块合理地层压力,有效调整注入、产出剖面和注采结构,减缓层间矛盾,提高油层动用程度,改善开发效果。

Aiming at the reservoir heterogeneity in experimental area,obvious differences of interlayer producing features,the influencing factors are analyzed by using grey correlation analysis(the well thickness,thickness of the number of connected direction,oil saturation,water cut,velocity of wellblocks with water-cut rising)and grey association degree,water injection wellblocks,the correlation degree are used to quantitatively determine the size of each influencing factor of the wellblocks,the related theoretical formulas and water injection intensity are derived.Based on the actual situation of the experimental areas,water injection wellblocks are reasonable splitted to further split them into layers,layers of constraint and all of the formation of reasonable water injection strength,each layer of water injection intensity is analyzed,reasonable water injection intensity and scope of each layer of experimental area are also analyzed.Through the reasonable matching of injection intensity,it can realize the reservoir homogeneous displacement,keep the reasonable formation pressure,effective adjustment,injection production profile and injection structure,reduce interlayer contradiction,improve producing degree of reservoirs,improve development effect.