Performance Evaluation and Mechanism Analysis of Microsphere/Polymer Compound System
In order to explore the interaction between polymer and microsphere,the microstructure of microsphere and"microsphere + polymer"complex system was observed by scanning electron microscopy,and the viscosity increasing ability of microsphere solution,polymer solution and"microsphere + polymer"complex system was evaluated by using Brookfield Viscometer.On this basis,the plugging performance of polymer solution was compared with that of polymer and microsphere slug injection.The experimental results showed that the"microsphere + polymer"composite system after 15 days had a dense network microstructure.When the mass fraction of microspheres remained constant,the viscosity of the composite system increased with the increase of polymer mass fraction.At the permeability conditions of 2 000×10-3 μm2,3 000×10-3 μm2 and 5 000×10-3 μm2,compared with polymer injection alone,the slug injection method of"microsphere + polymer"system had lower resistance coefficient and could effectively control the injection pressure.The"microsphere + polymer"compound system had good injection performance and the plugging rate was close to that of polymer injection alone,which was 98.82%,98.40%and 72.50%,respectively.
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