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| Enhanced foam generation using low frequency vibration waves |
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LIU Jing1,2, XIA Junyong3, LIU Xi4, WU Feipeng1,2, LI Zhengbin1,2
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(1.School of Petroleum Engineering in China University of Petroleum(East China), Qingdao 266580, China;2.Key Laboratory of Unconventional Oil & Gas Development(China University of Petroleum (East China)),Qingdao 266580, China;3.Daqing Oilfield Production Technology Institute, Daqing 163453, China;4.Zhidan Oil Production Plant, Shaanxi Yanchang Petroleum(Group)Company Limited, Yan 'an 717500, China)
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| Abstract: |
| In order to explore the effect of low frequency vibration waves on enhanced foam generation, assisted foam generation experiments were conducted using capillary tube and etched porous media models with and without vibration. The experimental results show that applying low frequency waves can shorten the foaming time, improve the utilization ratio of foam agent and increase the number of foam bubbles. Under vibration frequency of 15 Hz and acceleration rate of 0.5g (g is the gravity acceleration),the foam generation time can be reduced by 42%. Under frequency of 25 Hz and acceleration of 0.3 g, the utilization ratio of foam agent and the number of bubbles can be increased by 16.33% and 5.59 times, respectively, in comparison with that without vibration. Application of low frequency vibration waves can shorten foaming time and increase foaming rate, which can be attributed to decreasing the drag force in vertical direction of the foam film, increasing the shear force in horizontal direction and reducing the critical pressure of the snap-off and liquid membrane truncation. |
| Key words: low frequency wave enhanced foam generation capillary porous media foaming mechanism |
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