| The development effect of different units in the late stage of polymer flooding in Bohai SZ Oilfield is significantly different.Long-term polymer injection in layers without distinguish makes the production of reserves more unbalanced,and the distribution of remaining oil in plane and vertical layers is more complicated.It is necessary to clarify the late development potential of polymer flooding to determine a reasonable development and adjustment technology strategy to guide the subsequent deep development of the oilfieldBased on the production performance of the target oilfield in the late stage of polymer flooding,the paper applies the development dynamic analysis method of polymer flooding,and studies the dynamic change law and the main controlling factors of the development effect in the late stage of polymer flooding;comprehensive seepage mechanics,reservoir engineering theory and numerical simulation technology,determined the advantageous development potential area of the target reservoir after polymer flooding and the development adjustment strategy based on the equilibrium displacement target.The main research work includes:(1)Through dynamic tracking analysis and development effect evaluation of polymer flooding in Bohai SZ Oilfield,a comprehensive evaluation method for late stage effect of polymer flooding was formed,and then the main controlling factors affecting the development effect of polymer flooding in reservoirs were determined;(2)Establish a quantitative characterization and potential evaluation method for remaining oil based on the distribution law of seepage field in polymer flooding,determined the advantageous development potential unit in the later stage of polymer flooding in Bohai SZ oilfield;(3)Establish a theoretical model of non-piston flooding under typical well pattern conditions of the reservoir,and through theoretical calculation and analysis under different conditions,determine the injection-production boundary for realizing balanced flooding between wells in the later stage of polymer flooding;(4)A typical numerical simulation model reflecting the characteristics of the late polymer flooding in the Bohai SZ oilfield was established,and a comprehensive evaluation method including the improvement effect of the seepage field and the recovery effect was proposed;(5)In view of the development status and potential distribution characteristics of polymer flooding in the Bohai SZ oilfield,appropriate development potential units are selected,and targeted development and adjustment suggestions are put forward.Through the research on the late development effect evaluation,advantage potential and differentiated adjustment strategy of polymer flooding in Bohai SZ oilfield,the deep development and adjustment technology for the late stage of polymer flooding in the reservoir has been formed,which provides technical support for the development of similar oil fields. |
