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| Study on mobility control of polymer/surfactant oil-displacing agent and reasonable mobility ratio |
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NIU Li-wei1, LU Xiang-guo1, YANG Huai-jun2, ZHANG Jie2, LI Jian-bing3
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(1.Key Laboratory of Enhanced Oil Recovery of the Ministry of Education, Northeast Petroleum University, Daqing 163318, China;2.Oil Production Technology Research Institute, Dagang Oilfield, PetroChina, Tianjin 300280, China;3.Eighth Oil Production Plant of Daqing Oilfield Limited Company, PetroChina, Daqing 163514, China)
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| Abstract: |
| The oil reservoir in Gangxi III block of Dagang Oilfield was studied, in which the influence of the mobility control effect of polymer/surfactant (PS) on the flooding effect and the influencing factors of reasonable mobility(viscosity) ratio were investigated. The results show that with the increase of oil viscosity, average permeability and permeability variation coefficient, the contribution rate of mobility control to the oil recovery efficiency of compound flooding increases. Compared with polymer solution, the mobility control effect of surfactant solution is poor relatively. In this process, it still flowed along the primary channel of water flooding, and the oil recovery efficiency was only increased by reducing the remaining oil saturation of the channel, which resulted in the undesirable flooding effect. The mobility control contributes more than 65% to the oil recovery efficiency of PS flooding and the reasonable viscosity ratio of chemical oil-displacing agent to crude oil is between 0.81and 1.45for Gangxi III block of Dagang Oilfield. |
| Key words: polymer/surfactant flooding mobility control displacement efficiency recovery efficiency viscosity ratio mobility ratio physical modeling |
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