非封闭油藏注水开发效果评价

EVALUATION OF WATER FLOODING EFFECTS OF UNSEALED RESERVOIRS

国内油藏开发往往是以单元或者区块的形式开发的，这些开发单元很多都是人为切割的，客观上并非封闭的一个体系。非封闭油藏开发过程中，地下流体与外界是相通的，这样就形成外界流体对油藏的供给或者油藏流体的溢出现象。外界流体供给与油藏流体溢出对开发单元的注水开发效果具有重要的影响。在油藏物质平衡的基础上，获得该开发单元的水侵变化规律，在此基础上建立了非封闭油藏注水开发利用效果评价方法，得到了考虑水侵量的综合存水率与综合水驱指数等注水开发效果评价指标。运用该方法对双河油田437断块油藏注水开发效果评价，结果表明综合存水率与综合水驱指数对非封闭油藏的注水评价更科学更准确。

Reservoirs in our country are usually developed in the forms of units or blocks, most of these develop- ment blocks are divided artificially, but in fact they are not unclosed systems. In the course of their development, underground fluids are connecting with the outside, thus the phenomenon of supply from outside liquids or reservoir liquid overflow must happen. This phenomenon has important influence on water flooding effects of development u- nits. On the basis of material balance of reservoirs, this paper obtains the change laws of water intrusion in this de- velopment block, establishes the effect evaluation method of unsealed reservoirs by water flooding, and finally gets development effect evaluation indexes, such as comprehensive water-remained ratio considered water intrusion, combined water flooding index and so on. With the help of the above method, the water flooding effects are evalua- ted in Fault Block 437 of Shuanghe Oilfield. The results show that the above two indexes are more scientific and accurate for water flooding evaluation of unsealed reservoirs.