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| A new hydraulic fracturing method for rock stress measurement based on double pressure tubes internally installed in the wire-line core drilling pipes and its application |
| WU Aiqing,HAN Xiaoyu,YIN Jianmin,LIU Yuankun |
| (Key Laboratory of Geotechnical Mechanics and Engineering of the Ministry of Water Resources,Yangtze River Scientific Research Institute,Wuhan,Hubei 430010,China) |
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Abstract The theoretical and technical developments regarding the hydraulic fracturing measurement of rock stress were reviewed firstly. Two hydraulic fracturing methods,including the single drilling pipe based measurement method and the traditional double tubes based hydraulic fracturing method consisting of an externally strapped hydraulic pressure tube and a drilling pipe,were discussed regarding the measurement process features and the application conditions. The wire-line core drilling technique was preferentially used for the geological investigation in the water transfer project at Dianzhong in Yunnan Province,China,due to complicated geological conditions. A new method of hydraulic fracturing measurement of rock stress with double tubes internally installed and sectionally fixed in the wire-line core drilling pipes was proposed to satisfy the special features of the wire-line core drilling technique. The development of corresponding system of equipment operation,the regulation of measurement process and the estimation of possible pressure loss along the hydraulic pressure tubes were studied. Finally,the proposed hydraulic fracturing method was implemented in 5 boreholes with 56 sections of measurement and the maximum depth being 724 m. The measurement technique proposed in this paper resolves the challenging problem that the wire-line pipes cannot be directly used in traditional hydraulic fracturing method,and provides a new technique for rock stress measurement in complicated conditions.
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