聚合物溶液的流变行为对油井流入动态曲线的影响

Effect of Rheological Behavior of Polymer Flooding on Oil-well Inflow Performance

考虑了聚合物溶液在孔隙介质中因剪切降解、吸附、滞留和稀释等引起的地层流体流变性变化 ,建立了考虑流变参数变化和井底附近地层渗透率变化的聚合物驱油井流入动态预测模型 ,用有限差分方法对其进行求解 ,并分析了流变参数变化和渗透率变化对油井产量的影响。利用该模型 ,对大庆油田某聚合物驱区块中 2口油井的流入动态进行预测 ,将预测结果与实测结果进行对比 ,其平均相对误差 <10 %。

A dynamic model of inflow performance is set up in view of main problems occurring in prediction of inflow performance of oil well for polymer flooding reservoir, and considering the change of rheological behavior along the seepage flow direction resulted from shear degradation, adsorption, dilution, etc., and the variation of permeability resulted from the damage, polymer colloid and the emulsion of oil-water near the well bore. The model is solved by finite differential method. The effects of rheological parameter and permeability variation on the production rate and water cut are analyzed. The inflow performance relationships for two oil wells in polymer flooding area are predicted using the model presented. Comparing the calculate results with the observed data, the average relative error is less than 10%.