Study on Fluorescence and Profile Control and Flooding Properties of Functional Profile Control and Flooding Microspheres
As a kind of deep profile control agent with good performance,polymer microspheres are widely used in the treatment of water control and oil stabilization in the middle and late stage of oilfield waterflood development.Due to the large reservoir thickness and serious heterogeneity in Bohai Sea,the development effect of water flooding is poor.Currently,limited by microsphere materials and detection methods,it is difficult to achieve accurate detection of the output liquid of microsphere profile control and flooding.According to the actual needs of the field,adding fluorescent carbon points to polymer microspheres to prepare functional profile control and flooding microspheres with fluorescence was proposed.The microstructure and fluorescence characteristics of the microspheres were characterized by Malvern particle size analyzer and fluorescence spectrometer,and the enhanced oil recovery capability was evaluated by core displacement experimental equipment.The results showed that after dispersing in simulated water for 5 d,the particle size of the functional modulated microspheres was mostly concentrated in about 0.9 μm and 6.0 μm,which had certain hydration expansion.The fluorescence intensity of the aqueous dispersions of functional profile control and flooding microspheres prepared by adding different amounts of fluorescent carbon points increased with the increase of the preparation mass concentration.The use of functional modulated microspheres could further improve the oil recovery,with an overall increase of 18.22%.The fluorescence intensity measurement method improved the detection sensitivity and could monitor the microsphere mass concentration at each port in real time.
Enhanced oil recoveryFluorescence intensityPolymer microspheresProfile control
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