Lithologic Reservoirs ›› 2017, Vol. 29 ›› Issue (4): 124-130.doi: 10.3969/j.issn.1673-8926.2017.04.015

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Acoustic emission characteristics of rocks with different brittleness

ZHAO Wanchun1, MA Yunpeng1, WANG Tingting2, CHENG Dong3, CHEN Yanqiu1, FENG Xiaohan1   

  1. 1. School of Petroleum Engineering, Northeast Petroleum University, Daqing 163318, Heilongjiang, China;
    2. School of Electrical Engineering & Information, Northeast Petroleum University, Daqing 163318, Heilongjiang, China;
    3. Department of Engineering Technology, Bohai Drilling Engineering Co., Ltd., Tianjin 300457, China
  • Received:2017-02-13 Revised:2017-04-06 Online:2017-07-21 Published:2017-07-21

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Abstract: Current researches on acoustic emission test of rock are mostly focused on the mechanical properties of rock,and the acoustic emission test of rock brittleness is relatively a few. The uniaxial test and acoustic emission tests were carried out on four kinds of rock samples with different brittleness which are cement mortar rocks with different sand ratio,so as to obtain the stress-strain curves and the acoustic emission count curves. The result shows that the sand ratio of samples is positively related with rock brittleness. The greater the rock brittleness is,the greater the slope of the elastic deformation section is,the faster the stress drops and the larger the strain is after the peak on the stress-strain curves. On the acoustic emission count curves,the more brittle the rock sample is,the earlier the time that acoustic emission signal appears and the greater the maximum value of the acoustic emission count is. The acoustic emission count curves before the peak show that with the increase of rock brittleness,the fracture mode of samples transits from progressive fracture to burst fracture,and the fracture morphology of samples is changed from tensile crack to shear crack and mixed cracks. Overall,rocks with different brittleness have different acoustic emission characteristics,so acoustic emission characteristics can be used to judge the rock brittleness. This test result has theoretical reference value and practical significance for the evaluation of rock brittleness and hydraulic fracturing scheme design.

Key words: reservoir characteristics, diagenesis, tight oil, A'ershan Formation,Erennao'er Sag, Erlian Basin

CLC Number: 

  • P584
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