| Serious imbalance in reservoir water absor:ption of water driving development in Huabei Liu 70 fault block is a big problem.A rapid increase in water cut causes the difficulty in improving the ultimate recovery of conventional waterflooding.There is an urgent need to use profile control technique to better the development effect.In this paper,geological features and effect of prophase profile control was analyzed and a series of laboratory evaluation and numerical simulation study was designed.Finally the profile control program in Liu 70#474 was given and it provides bases for reasonable adjustment measures.(1)The recovery of homogeneous reservoirs with high water can be effectively improved by the combination flooding system;there have the low recovery in waterflooding the heterogeneous reservoir,waterflood after injection the KD4 profile control system that can greatly improve the degree of recovery reservoir.Within a certain range of permeability ratio,the greater permeability ratio,in the heterogeneous reservoir,the worse the reservoir water flooding effect,however,the KD4 profile control effect is better.So,the right amount of composite profile control flooding system are injected after waterflooding,which can reduce the injection pressure,increase the injection capacity,enhance the effect of the wash oil,and improve the recovery.(2)There should be the reasonable injection rate,injection of profile control and flooding in the high water content in heterogeneous reservoir real control and oil displacement process for the fault block Liu 70,this can achieve the purpose of fully tap the potential in the interlayer.(3)Based on physical modeling and numerical simulation results,combined with the analysis and evaluation of profile control and flooding in recent years,it is recommended for the fault block 474 to carry out measures of profile control and flooding with the principle of"Profile control and flooding is the first,waterflooding is the second". |
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