Influence of Mixing Speed on Demulsification Effect of Enhanced Foam Flooding Produced Fluid

With the continuous improvement of the exploitation degree of oil fields, most of the domestic oil fields have entered the tertiary production stage. As a relatively mature oil production technology in the tertiary oil production stage, enhanced foam flooding technology is widely used in all oil fields. At the end of 2014, a combined station of an oil field began to carry out the production test of nitrogen foam drive. With the increase of the number of measure wells and the implementation of strengthening nitrogen bubble foam drive, the emulsion strength of the produced fluid entering the combined station gradually changed, and the difficulty of dehydration increased. Specifically, the water content at the outlet of the two-phase separator fluctuates seriously, the crude oil dehydration temperature rises, and the energy consumption increases; Due to the high degree of emulsification of the produced liquid, it is more difficult to dewater the crude oil, and the demulsifier needs to be adjusted repeatedly; The water content of crude oil is difficult to meet the standard, and it has occupied the storage capacity of the combined station for a long time, so the overall operation efficiency of the combined station is low. This paper takes the produced liquid of an oil field combined station as the research object, analyzes the physical properties of the produced liquid of foam flooding, explores the effects of different water content, foaming agent concentration and polymer concentration on the physical properties of crude oil, and then carries out experimental research on adding foaming agent and polymer respectively at different mixing speeds, simulates the mixing state of crude oil, foaming agent and polymer, and analyzes the influence of mixing speed on the dehydration effect of the produced liquid of binary composite flooding crude oil, It provides a technical direction for the research of demulsification and dehydration technology of produced fluid from enhanced nitrogen foam flooding in this oilfield.