Study on the emulsification characteristics of heavy oil during chemical flooding

Chemical flooding is a very important method to the efficient development of heavy oil reservoir. A clear understanding relationship between emulsification characteristics during chemical and test methods that current used evaluate properties agent can be useful for oilfields oil. In this study, oil–water interfacial tension (IFT) in water (O/W) emulsion (emulsification state, droplet size, viscoelasticity, stability) formed by six agents at different concentration are tested. Then, combined with dynamics, process studied influence mechanisms O/W on recovery clarified. Finally, effect injection profile turnover parallel sand-packed tube experiments. Studies show all greatly reduce IFT (more than 90%). However, stronger ability, smaller better stability emulsion, agent. This mainly because most effective action stage time before front flow reaches production outlet, injected into formation. During period, amount emulsified oil, width zone, affect efficiency. Therefore, when screening agents, speed, viscoelasticity primary evaluation factors. addition, through experiment, it found ability agent, performance ability. For reservoirs channel has formed, using control effectively block dominant channels improve thus achieving purpose improving swept area. The research results provide guidance characteristic construction optimizing reservoirs' development.