There are two diametrically opposite views of the influence of slickwater on shale permeability among scholars at home and abroad. We used the shale outcrops rock samples from the Lower Silurian Longmaxi Formation in Sichuan Basin. The permeability of these dry samples before and after immersion in different solution systems were tested by pulse attenuation method. The experimental results show that the impregnation of different slickwater components and standard salt solution can promote the increase of the permeability of shale samples. The stress sensitivity of shale samples after liquid immersion is medium weak to weak. The sample stress sensitivity is weak after soaked by the synergist solution and Drag reducing agent solution, and the sensitivity of the sample stress is medium weak after immersed by the standard saline solution, defoamer solution and antiswelling solution; The Ki/K0 of the shale sample after liquid immersion on σi/σ0 is consistent with the exponential stress sensitive evaluation model. With the increase of soaking time, the increase of sample permeability increases first and then decreases.
Z. Liu et al., "Experimental Study on the Influence of Slickwater on Shale Permeability," IOP Conference Series: Earth and Environmental Science, vol. 113, no. 1, Institute of Physics Publishing, Dec 2018.
The definitive version is available at https://doi.org/10.1088/1755-1315/113/1/012225
3rd International Conference on Advances in Energy Resources and Environment Engineering, ICAESEE 2017 (2017: Dec. 8-10, Harbin, China)
Geosciences and Geological and Petroleum Engineering
Keywords and Phrases
Drag reduction; Energy resources, Attenuation method; Drag reducing agents; Evaluation modeling; Liquid immersion; Permeability increase; Saline solutions; Stress sensitive; Stress sensitivity, Shale
International Standard Serial Number (ISSN)
Article - Conference proceedings
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01 Dec 2018