注水井合理配注方法研究——以双河区块Ⅵ油组为例

油田注水开发后期,层间矛盾和平面矛盾日益加重,油层非均质严重,水淹不均衡,通过对注水井合理配注,改变液流方向,在油层中造成新的压力场,使注入水进入波及较差地区和井网未控制地区,从而使动用较低的相对富集的剩余油推向井底而被采出,提高油田开发效果。文中动静结合,既考虑储层本身物性差异,又考虑长期注水开发带来的平面和层间矛盾,以数模为手段,通过层间渗透率和注水强度的改变来确定垂向合理配注;然后以油井为中心,根据注采平衡,确定平面配注;综合垂向配注和平面配注,最终确定注水井在每个层上的合理注水量。

Research on reasonable injection allocation method of injection well

In water flood development oilfield,contradiction among different layers and planes is getting increasingly serious,e specially during the late stage of oil field development, when reservoir heterogeneity becomes severe and water flooding imbalanced.Therefore,it is important to have reasonable injection rate so as to improve water flood effectiveness. In order to inject water into poor areas and uncontrolled areas of well pattern,flow direction should be changed.While considering the differential physical properties and the contradiction among different layers and planes after longtime water flood development and adjustment,by means of numerical simulation,reasonable injection allocation in vertical direction was determined.After that,by making oil wells as the center,plane injection allocation was ascertained according to balanced injection and production rate.In the end,injection flow rate on each layer could be confirmed by the vertical injection allocation and plane injec- tion allocation together.