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Determination of facture toughness of rocks of a shale gas reservoir using straight-notched brazilian disc (snbd) specimen and well logs

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Category: Mining

Last Updated on 04 August 2016

Published on 04 August 2016

Hits: 3615

Authors:

Chen Zijian, State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum, Beijing, China

Yu Baohua, State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum, Beijing, China

Yuan Junliang2, China National Offshore Oil Corporation Research Institute, Beijing, China

Zhang Yanan, State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum, Beijing, China

Deng Jingen, State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum, Beijing, China

Abstract:

The straight-notched Brazilian disc (SNBD) specimen is used to test the mode-I and mode-II fracture toughness of a shale gas reservoir. The tests are conducted on 14 shale specimens which are taken from the shale gas reservoir in the southwest Chongqing, China. The technique of high-pressure water jet cutting is applied to process the pre-existing notch within specimens to avoid the influence of central hole on the notch to ensure the accuracy of the testing results. Based on the testing results, mode-I and mode-II fracture toughness prediction models of the shale gas reservoir are established. The predicted fracture toughness and testing results show good agreement. The results indicate that the mode-I and mode-II fracture toughness of the shale gas reservoir are in direct proportion to the rock density and interval transit time, and inversely proportional to the shale content. The prediction models can be used to establish continuous fracture toughness profiles of the shale gas reservoir and effectively guide the selection of optimal layer before hydraulic fracturing.

References / Список літератури

1. Jin Yan, Chen Mian, Zhang Xudong, 2001. Determination of Fracture Toughness for Deep Well Rock with Geophysical Logging Data, Chinese Journal of Rock Mechanics and Engineering, 20(4), pp. 454– 456.

2. Dwivedi, R. D., Soni, A. K., Goel, R. K., 2000. Fracture toughness of rocks under sub-zero temperature conditions, International Journal of Rock Mechanics and Mining Sciences, 8(37), pp. 1267–1275.

3. Al-Shayea, N. A., Khan, K., Abduljauwad, S. N., 2000. Effects of confining pressure and temperature on mixed-mode (I–II) fracture toughness of a limestone rock, International Journal of Rock Mechanics and Mining Sciences, 37(4), pp. 629–643.

4. Zhao Fei, 2013. Research of Mechanical Parameters with Geophysical Method in Shale Gas Reservoir, Master thesis. China University of Petroleum, Beijing.

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