【摘要】 不可及孔隙体积对开发井的见聚时间和注聚动态监测有直接影响,其随着聚合物溶液浓度的增加而大幅度降低,而且对聚合物驱提高采收率影响较为敏感。现有的ECLIPSE,CMG和VIP 3种商业化软件对不可及孔隙体积的处理方法各异,而且均未从定义出发,致使计算结果出现差异。为此,从不可及孔隙体积的定义出发,分析了不可及孔隙体积对聚合物突破时间和采收率的影响,以及3种商业化软件中存在差异的原因。研究结果表明,考虑不可及孔隙体积将会导致见聚时间提前,随着不可及孔隙体积的增加,见聚时间将会大幅度提前,与常规数值模拟结果相差较大。若不可及孔隙体积系数选取不当,将会对数值模拟结果造成较大影响,甚至会影响到后续作业的决策。因此,在现场预测中必须考虑不可及孔隙体积的影响,应该在多孔介质中的聚合物溶液流动数学模型中用有效聚合物孔隙度替换总孔隙度。更多还原

【Abstract】 Inaccessible pore volume(IPV) has direct impacts on the polymer breakthrough time in production wells and dynamic monitoring for polymer injection.IPV decreased deeply with increasing polymer solution concentration,and which is sensible factor to EOR of polymer flooding. However,none of the existing software in the market treats the inaccessible pore volume from its definition,this results in a calculation deviation. Based on the definition of inaccessible pore volume,the effect of IPV on the polymer breakthrough time and oil recovery is analyzed and the reason of the difference among the commercial softwares is analyzed in this paper.According to the simulation results,it is shown that the polymer breakthrough time is shorter when the IPV is considered and is considerably shorter with the increasing IPV,which will have a significant impact on numerical simulations.If the IPV factor is not selected properly,it will have a significant impact on numerical simulation and even the decisions on sequent operations.Therefore,during the process of numerical simulations and field predictions,the effects of IPV must be considered,and the total porosity should be replaced with effective polymer porosity in the mathematical models of polymer flooding in porous media.更多还原