Abstract
Oil displacement efficiency of oil sands can be improved by combining low-frequency resonant wave with chemical displacement agent. Through experiments targeted on oil displacement effect of the compound oil displacement agent, we selected the most suitable one for a certain oilfield: 15~20 g/L NaOH+20~25 g/L Na2CO3＋9~12 g/L XY. Besides, on the basis of selected compound oil displacement agent, the influence of vibrational wave on oil displacement effect was also investigated according to vibration principle of low-frequency artificial vibration. Results show that, when the frequency of artificial vibration is 25-40Hz, acceleration exceeds 0.6 m/s2 and effective time is 12min, oil displacement efficiency achieved 97.26%, indicating that oil displacement effect of recombination action is better than that of chemical method alone, hence low-frequency resonant wave can be used in oil sands displacement.
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