Viscoelastic surfactant fluids filtration in porous media: A pore-scale study |
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| Authors: | Yuan Li Caili Dai Yining Wu Ke Xu Mingwei Zhao Yuhe Wang |
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| Affiliation: | 1. Shandong Key Laboratory of Oilfield Chemistry, School of Petroleum Engineering, China University of Petroleum (East China), Qingdao, China;2. Peking University, Energy and Resources Engineering Department, Beijing, China;3. Key Laboratory of Unconventional Oil & Gas Development, School of Petroleum Engineering, China University of Petroleum (East China), Qingdao, China |
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| Abstract: | We investigated the flow of viscoelastic surfactant (VES) solutions, an important type of fracturing fluids for unconventional hydrocarbon recovery, through a diverging–converging microfluidic channel that mimics realistic unit in porous media. Newtonian fluid and viscoelastic hydrolyzed polyacrylamide (HPAM) solution were used as control groups. We vary Deborah numbers (De) up to 61.2, and found that the flow patterns of HPAM and VES solutions become very different once De ≥ 6.12. This is attributed to different generation mechanisms of viscoelasticity, thus different responses to extensional rates at pore-throats, for HPAM and VES solutions. It results in significantly smaller pressure drop of VES solutions through the microchannel compared to HPAM solution. It interprets higher filtration loss of VES solution than HPAM in core experiments and in field observations. The set-up can be generalized as a prototype to effectively evaluate the filtration of fracturing fluids. |
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| Keywords: | filtration hydraulic fracturing microfluidics viscoelastic surfactant solution |
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