双河油田注采井组剩余油分布规律研究

根据双河油田Ⅴ下层系油藏特征建立非均质模型,得到不同模型剩余油分布模式;分析不同地质、开发条件对剩余油分布的影响。通过回归分析,得到注采井组生产井综合含水率达到95%时,采出程度、剩余油非均质程度与不同因素(提液速度、井距、平面渗透率级差、地层倾角、油层厚度)的关系式。分别应用回归公式和数值模拟对双河油田五点井网的采出程度、剩余油非均质程度进行计算,二者结果误差均小于10%。综合运用回归公式定量描述剩余油及井组剩余油分布模式对今后实际油田注采井组单元后期开发调整具有一定指导意义。

Study on Remaining Oil Distribution of Injection-production Well Group in Shuanghe Oilfield

According to the reservoir features of the lower member of V Stratum in Shuanghe Oilfield,a heterogeneous model was established,and remaining oil distribution pattern of different models was obtained.The effects of different geological and development conditions on remaining oil distribution were analyzed.Through regression analysis,the correlation of recovery percent,remaining oil heterogeneity degree and other factors(such as fluid extracting rate,well spacing,plane permeability ratio,formation dip angle and reservoir thickness) could be acquired when the composite water cut reached 95% in production well in the flooding pattern.A regression equation and numerical simulation were used respectively to calculate the recovery percent and remaining oil heterogeneity degree of five-spot pattern in Shuanghe Oilfield.The errors of these two methods are less than 10%.The integrated application of regression equation is significance for describing the remaining oil and its distribution pattern quantitatively,it provides a guidance for future adjustment in flooding pattern of oilfields.