Research On Water Flooding Law And Development And Adjustment Strategy Of Yanchang AB Low Permeability Reservoir

Low permeability reservoirs are characterized by low reservoir permeability,complex pore structure,poor physical properties,large lithological changes,and serious heterogeneity of reservoirs.Therefore,it is of great significance to study the water flooding law of low permeability reservoirs and to study their reasonable potential tapping strategies.This paper focuses on the geological characteristics and production characteristics of low-permeability reservoirs,and extends the AB reservoir as an example.The main achievements and understandings of the research are as follows:(1)The Yanchang AB reservoir belongs to the low-permeability lithologic structural reservoir.After more than ten years of stable production,the remaining oil distribution is highly dispersed,and the reservoir development is in a turning point that gradually enters the stage of steady decline,and many problems are exposed during the water injection development process.It is difficult to stabilize production in the later period.Based on the analysis of reservoir engineering,the reservoir development and production dynamics,the change law of production,the water injection utilization and the change law of water flooding characteristics were analyzed.At the same time,the effect of oil storage and water control measures was evaluated.(2)Combined with the previous numerical simulation results,the remaining oil types,the distribution of remaining reserves and the characteristics of reservoir flooding were quantitatively studied.(3)The reasonable injection-production technology strategy of hydrodynamic adjustment of oil and water wells is determined,and the preliminary design of reservoir hydrodynamic adjustment scheme is carried out.The development performance prediction and development effect analysis of the implementation of hydrodynamic adjustment are carried out.