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| Feasibility study on foam-assisted gas flooding EOR technology in karstic oil reservoir |
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LIU Zhongchun1,2, WANG Yong3,4, HOU Jirui3,4, LUO Ming3,4, ZHENG Zeyu3,4, QU Ming3,4, ZHU Daoyi3,4
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(1.Exploration and Development Research Institute, SINOPEC, Beijing 100083, China;2.SINOPEC Key Laboratory of Marine Oil and Gas Reservoir Development, Beijing 100083, China;3.Enhanced Oil Recovery Institute in China University of Petroleum, Beijing 102249, China;4.MOE Key Laboratory of Petroleum Engineering in China University of Petroleum, Beijing 102249, China)
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| Abstract: |
| According to the characteristics of the karstic oil reservoir, the two-and three-dimensional visual physical model of karstic media were constructed to study the displacement mechanisms and the characteristics of remaining oil under water, gas and foam flooding, respectively. Then, the suitability of foam in fractured-cavity media was analyzed. Also the experimental implementation effect of foam-assisted gas flooding was evaluated through a high-pressure and high-temperature 3D model. The results show that the foam-assisted gas flooding can remarkably improve the gas flooding of karstic oil reservoir. It is also found that the N2 foam flooding can increase the recovery of gas flooding by 7%. The viscosity increasing effect and the adjustable flow resistance would be the main mechanism for expanding swept efficiency, which are beneficial to displace the by-pass oil and the remaining oil trapped in the closed fractures. Foam assisted gas flooding as an EOR technology in karstic carbonate reservoir is preliminary feasible. |
| Key words: karstic oil reservoir foam flooding sweep efficiency fracture remaining oil |
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