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Journal of Porous Media
IF: 1.49 5-Year IF: 1.159 SJR: 0.504 SNIP: 0.671 CiteScore™: 1.58

ISSN Print: 1091-028X
ISSN Online: 1934-0508

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Journal of Porous Media

DOI: 10.1615/JPorMedia.v21.i3.10
pages 197-208

IMPROVEMENT OF OIL RECOVERY THROUGH A NOVEL LOW-TENSION FOAM FLOODING AFTER ENHANCED OIL RECOVERY PROCESSES

Shanfa Tang
Department of Petroleum Engineering, Yangtze University, Wuhan, China
Lei Tian
Department of Petroleum Engineering, Yangtze University, Wuhan, China
Jun Lu
McDougall School of Petroleum Engineering, The University of Tulsa, Tulsa, Oklahoma, USA
Zhengxin Wang
Institute of Exploration and Development, Henan Oil Field, Zhengzhou, China
Yunlong Xie
Institute of Exploration and Development, Henan Oil Field, Zhengzhou, China
Xiaopei Yang
Institute of Exploration and Development, Henan Oil Field, Zhengzhou, China
Xiaoyang Lei
Department of Petroleum Engineering, Yangtze University, Wuhan, China

ABSTRACT

Shuanghe oil field is a sandstone reservoir characterized by high water cut, poor sweep efficiency, and high heterogeneity with a long history of water flooding. The field has completed polymer flooding and is now under surfactant-polymer (SP) flooding. Although the SP flood is close to the end, the residual oil saturation is estimated to still be about 46%–50% original oil in place. Therefore, future development of such reservoirs requires an efficient method to recover residual oil to be developed. In this paper, we presented a new high-temperature resistant nitrogen foam system that gives a low oil/water interfacial tension and improves the sweep efficiency after SP flooding. The optimal foam formulation is 0.4 wt % foam agent and 0.2 wt % foam stabilizer, which has a low interfacial tension (IFT) (5.31×10−2 mN/m) and high foam stability index (> 10,000 mL min). The optimal injection parameter of foam flooding is the coinjection of gas and solution, gas-to-liquid ratio of 1.5:1.0, foam injecting size of 0.5 pore volumes, and an injection rate of 1.0 mL/min. Compared with the other three enhanced oil recovery processes in a series of four oil displacement experiments, the foam flood showed the best performance and highest oil recovery. An additional core flood was also done to mimic the field processes. The results showed the foam flood can effectively recover residual oil after water, polymer, and SP flooding. All the experimental results indicate this low-tension foam flooding could find applications in the Shuanghe oil field.


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