| This article mainly focuses on the characteristics of high capacity channel, crack and the severely heterogeneous reservoirs to carry out the research of intelligent flexible viscoelastic profile control and flooding system to enhance oil recovery.First, we have analyzed the properties and mechanism of intelligent flexible viscoelastic profile control and flooding system. Second, through the laboratory experiment of static evaluation, we get that this system is salt-resistant, thermally stable, strong in gel strength and adjustable for gelation temperature etc which leads to the conclusion that the optimal formula concentration of the system is0.05%to0.8%. In addition, through the dynamic evaluation in porous medium, it is concluded that this agent has good performance of fluid diversion and flowability. Besides, plugging rate is over99.74%, the breakthrough pressure grads is36.3-46.4, drag coefficient is19-52and residual resistance factor is513-1730, which explain the high plugging strength, easy injection and nice flushing resistance. Finally, by enhancing oil recovery experiment, the optimum injection parameters has been determined:the system concentration is0.2%, the injection rate is0.1-0.3PV, slug composition is0.2%concentration front slug+0.1%concentration in main slug+concentration after0.05%of late and the injection pattern is intermittent alternating injection; water content of injection opportunity is around75%. By this parameters, oil recovery can be increased from18.6%to22.6%, and it provides technical support for site construction. |
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