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| Effect of micro forces caused by driving fluid with viscoelasticity on residual oil in chemical flooding |
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XIA Hui-fen1,WANG De-min2,WANG Gang2,WANG Hai-feng1
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(1. MOE Key Laboratory of Enhanced Oil and Gas Recovery, Daqing Petroleum Institute, Daqing \633\S .China;2. Department of Science and Technology Development, Daqing Oilfield, Daqing 1634531 China)
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| Abstract: |
| At the same viscosity，the oil displacement efficiency of viscoelastic polymer solution is different from that of glycerin solution without elasticity, and the difference could not be explained by macro forces. Therefore, the changes of micro forces acting on residual oil by driving fluids with and without elasticity and the effect of driving fluids properties on oil displacement efficiency were analyzed. The streamlines and velocity of the fluids with and without elasticity flowing in simplified pore models were mathematically simulated through theoretical analysis and visual oil displacement experiment. The micro force variation with velocity and streamline and its effect on residual oil were analyzed, and the oil displacement efficiencies of different viscoeiastic fluids were obtained by visual core model. The results show that the micro force does not change the macro pressure gradient, and mainly acts on the protrudent portion of different types of residual oils and causes its shape change and migration. |
| Key words: chemical flooding viscoelastic driving fluid micro force residual oil |
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