Abstract
Polymer solution has extremely extensive applications in many natural and industrial processes, especially in oilfield development field, such as polymer flooding, fracturing and water shut-off. Thus, the study of flow behaviors of polymer in formation pores is significantly important. In this paper, the flow behaviors of the polymer droplets in the 3-D pore throat structure were systematically studied. Additionally, the influencing factors (polymer concentration, molecular weight and pore throat ratio, for instance) were investigated. As the increasing of polymer concentration and molecular weight, the polymer droplets were more difficult to break, which means the critical flow rate decreased and the average sizes of the first daughter droplets (FDD) were longer synchronously. Moreover, with the increase in pore throat ratio, the critical flow rate increased and the length of the FDD decreased. In addition, the prediction models of the length of the FDD with polymer concentration and pore throat ratio were established, respectively. The prediction model revealed that the length of the FDD satisfied an exponential relationship with the polymer concentration and a linear relationship with the pore throat ratio. Finally, the average size of droplets after macroscopic core flooding experiment was 8 μm and 17 μm when the polymer concentration was 0.01% and 0.1%, respectively. The results were consistent with the breakup behaviors of polymer droplets in the microscopic pore throat structure.
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Funding was provided by National Key Research and Development Program of China (Grant No. 2019YFA0708700), the National Natural Science Foundation of China (Grant No. 51704313) and the Fundamental Research Funds for the Central Universities (Grant No. 18CX02028A).
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Dai, C., Chu, Z., Jiang, Q. et al. Breakup Behaviors of Viscoelastic Polymer Droplets in 3-D Pore Throat Structure Microchannel. Transp Porous Med 144, 133–148 (2022). https://doi.org/10.1007/s11242-021-01608-z
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DOI: https://doi.org/10.1007/s11242-021-01608-z