In this study, we analyzed the flow-back resistance of slick water fracturing fluid in shale reservoirs. The flow-back resistance mainly includes capillary force, Van der Waals (VDW) force, hydrogen bond force, and hydration stress. Shale of Lower Silurian Longmaxi Formation (LSLF) was used to study its wettability, hydration stress, and permeability change with time of slick water treatment. The results reveal that wettability of LSLF shale was more oil-wet before immersion, while it becomes more water-wet after immersion. The hydration stress of the shale increased with increasing immersion time. The permeability decreased first, then recovered with increasing immersion time. The major reason for permeability recovery is that the capillary effect (wettability) and the shale hydration make macrocracks extension and expansion and hydration-induced fractures formation.
Effect of Slick Water on Permeability of Shale Gas Reservoirs
Natural Gas Engineering,
Chongqing University of Science and
Chongqing 401331, China
Contributed by the Petroleum Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received August 29, 2016; final manuscript received May 14, 2018; published online June 12, 2018. Assoc. Editor: Ray (Zhenhua) Rui.
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Yuan, B., Wang, Y., and Shunpeng, Z. (June 12, 2018). "Effect of Slick Water on Permeability of Shale Gas Reservoirs." ASME. J. Energy Resour. Technol. November 2018; 140(11): 112901. https://doi.org/10.1115/1.4040378
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