Aiming at the problem of unclear main influencing factors on the development effect of chemical flooding in medium-permeability reservoirs of SINOPEC,a typical medium-permeability block was selected,and numerical simulation methods were adopted to study the influence of reservoir geological parameters,development dynamic parameters and oil flooding system parameters on the chemical flooding development effect with the objective of oil flooding effect and economic index.Combined with the chemical flooding field application situation of SINOPEC,the relevant parameters for chemical flooding in a medium-permeability reservoir are proposed.It is suggested to prioritize to the implementation of chemical flooding in massive reservoirs,with a reserve size of about 150×104 t and a ratio of the number of injection and production wells in the well group between 1.5 and 2.5,chemical flooding can achieve better results.When the reservoir enters the high water-cut stage,chemical flooding should be implemented immediately.The earlier the water-cut injection timing(water-cut is lower than 90%),the higher the remaining oil saturation(remaining oil saturation is higher than 30%),the better the chemical flooding effect.The total amount of injection,injection method,injection slug PV,and injection concentration of the oil displacement system determine the economic effectiveness of chemical flooding.The effect of binary composite flooding is better than that of polymer flooding,and the total amount of injection is controlled within 1,200 PV•mg/L;the injection method is mainly based on the high frequency of small slug with high concentration,and the PV number of injection slug is controlled within the range of 0.5 to 0.6 PV.
medium permeability reservoirchemical floodingreservoir shapewater cut timingoil displacement methodinfluence law
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