Study On Profile Control And Oil Displacement Technology Of Foam For T22 Fault Block Reservoir

With the deepening of the exploration and development,the proportion of fault block reservoirs in proven reserves and measured reserves is also increasing,which has a significant role in maintaining the stable development of the oil industry.Compared with the whole reservoir,the distribution of fault block reservoir has the characteristics of "small,broken,poor and scattered",and after more than 10 years of waterflood development,most of them have entered the middle or high water cut stage.But the average reservoir recovery is relatively low compared with the whole reservoir.Therefore,fully understanding the characteristics of high water cut fault oil field,studying the distribution of remaining oil,and putting forward effective measures,are the foundation and core work to improve the block oil and gas reservoir development effect.Based on the investigation of the fault block reservoir`s present situation,the remaining oil distribution and profile control and flooding technology of foam,the paper analysed the T22 fault block reservoir dynamics,the characteristics of development,and history matched the whole area and single well,also studied the flat and vertical heterogeneity of the reservoirs,and analysied the distribution of remaining oil.Aiming for the serious reservoir heterogeneity and high water production ratio,this paper studied the development of nitrogen foam flooding system.Optimization experiment for foam agent system,nitrogen foam block experiment and profile control and flooding experiment in the heterogeneous reservoir were made.Based on the experimental study on the distribution of remaining oil and the study of nitrogen foam flooding,the paper made numerical simulation study on nitrogen foam flooding.Through establishing 9 sets of development programs according to the four factors three levels of orthogonal experimental design,the paper studied the effects of foaming agent concentration,injection rate,injection volume and slug number on foam flooding,analysed the law of foam flooding in T22 fault block reservoir,and eveloped a adjusting plan of the foam flooding.