一种叠加汽窜影响的稠油剩余油潜力评价方法——以井楼油田中区为例

油藏进入超高轮次蒸汽吞吐阶段以后,汽窜升级为网状面积汽窜,加剧了剩余油赋存状态的复杂程度及剩余油潜力评价的难度。在原有常规剩余油潜力评价方法的基础上,利用油藏工程确定泄油半径、汽窜宽度等参数,绘制网状汽窜分布图,将其与动态分析及油藏数值模拟研究的剩余油分布结果相叠合,形成了一种叠加汽窜影响的剩余油潜力评价方法。应用于井楼油田中区,明确了三种剩余油分布模式,划分出低采高黏、中采中黏、高采低黏三类剩余油潜力区,为制定超高轮次蒸汽吞吐阶段采收率提高的技术策略提供了依据。

A method for evaluating residual oil potential of heavy oil reservoirs affected by steam channeling——by taking the middle area of Jinglou oilfield as an example

After the reservoir entered the stage of super high cycle steam stimulation,steam channeling upgraded to network area steam channeling,which intensified the complexity of remaining oil occurrence and the difficulty of remaining oil potential evaluation. On the basis of the conventional residual oil potential evaluation method, the parameters such as drainage radius and steam channeling width are determined by reservoir engineering,and the network steam channeling distribution map is drawn, which is combined with the residual oil distribution results of dynamic analysis and reservoir numerical simulation, thus forming a residual oil potential evaluation method with superimposed steam channeling effect. After being applied in the middle area of Jinglou oilfield, three kinds of residual oil distribution patterns are defined and classified, namely, low production and high viscosity area, medium production and high production area, high production and low viscosity area, which provides a basis for formulating the technical strategy for improving oil recovery in ultra–high cycle steam stimulation stage.