MICRO-FORCE CALCULATION IN RESIDUAL OIL DISPLACEMENT BY VISCOELASTIC FLUID
MICRO-FORCE CALCULATION IN RESIDUAL OIL DISPLACEMENT BY VISCOELASTIC FLUID
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发表时间：
2011
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通讯作者：
Liu Li-li
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作者：
Liu Li-li
为进一步探讨聚合物柔性对剩余油的驱替机理，选用上随体麦克斯韦本构方程，建立了粘弹性流体在多孔道路中的流动方程。根据应力张量理论计算了残余膜上的水平偏应力差。分析比较了不同流变液、油膜宽度、压力梯度对残余油膜水平偏应力差的影响。结果表明：当水驱、幂律流体（n = 0.6）驱和粘弹性流体（We = 0.3）驱时，在实际采油平均压力梯度为0.02MPa/m时，残余油膜上的水平偏应力差之比约为1：10：25，即粘弹性流体（We = 0.3）对油膜的驱动力约为水驱的25倍。从理论上进一步证明了粘弹性流体可以提高微观驱油效率这一创新性结论。
To further explore the displacement mechanism of flexibility of the polymer to the residual oil,upperconvected Maxwell constitutive equation is selected,and flow equations of the viscoelastic fluidflow in porous road are established. The horizontal deviatoric stress difference on the residual film iscalculated on the basis of the stress tensor theory. The impacts of the different rheological fluid,thewidth of oil film,and pressure gradient on the horizontal deviatoric stress difference on the residualfilm are analyzed and compared. The results show that: When flooding with water,power law fluid(n = 0.6)and viscoelastic fluid(We = 0.3),the ratio of horizontaldeviatoric stress difference on the residual filmis about 1:10:25 at actual oil production mean pressure gradient of 0.02 MPa/m,which means that the driving force of viscoelastic fluid(We = 0.3)on the film is about 25 times the water flooding. This innovative conclusion that the microscopic displacement efficiency can be improved by viscoelastic fluids is further proved theoretically.