Petroleum Science >2021,??lssue 1:??- DOI: https://doi.org/10.1007/s12182-020-00479-1
Experimental study of multi-timescale crack blunting in hydraulic fracture Open?Access
文章信息
作者：Jing-Nan Dong, Guang-Jie Yuan, Xiang-Yang Wang, Mian Chen, Yan Jin, Chao Zeng & Musharraf Zaman
作者單位：
投稿時(shí)間：2020-7-13
引用方式：Dong, JN., Yuan, GJ., Wang, XY. et al. Experimental study of multi-timescale crack blunting in hydraulic fracture. Pet. Sci. 18, 234–244 (2021). https://doi.org/10.1007/s12182-020-00479-1
文章摘要
Hydraulic fracture is important in unconventional oil and gas exploration. During the propagation of the hydraulic fracture, the crack tip is blunted due to the development of the process zone in the near-tip area. In this study, the blunting of the hydraulic fracture in polymethyl methacrylate specimens due to multi-timescale stress concentration is investigated. The ratio of the initiation toughness to the arrest toughness of the blunted hydraulic fracture is measured using both the dynamic and the static methods. Results show that a hydraulic fracture can be blunted with the time span of stress concentration from 1 ms to 600 s. It is also shown that the blunting of hydraulic fracture is a highly localized process. The morphology of the blunted crack depends on the stress distribution in the vicinity of the crack tip.
關(guān)鍵詞
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Shale ;Tight sandstone ;CO2 huff-n-puff; Fracture ;Injectivity of CO2