Lithologic Reservoirs ›› 2019, Vol. 31 ›› Issue (2): 159-164.doi: 10.12108/yxyqc.20190218

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Calculation of shale fracturing pressure under physicochemical effect of formation water

ZHAO Xiaojiao1,2,3, QU Zhan1,3,4, SUO Xiangyu5, HAN Qiang3,4, ZHAO Huibo6   

  1. 1. School of Aeronautics, Northwestern Polytechnical University, Xi'an, 710072, China;
    2. School of Electronic Engineering, Xi'an Shiyou University, Xi'an, 710065, China;
    3. The Key Laboratory of Well Stability and Fluid & Rock Mechanics in Oil and Gas Reservoir of Shaanxi Province, Xi'an Shiyou University, Xi'an 710065;
    4. School of Petroleum Engineering, Xi'an Shiyou University, Xi'an 710065, China;
    5. Quality Safety and Environmental Protection Section, Chuanqing Drilling Turkmenistan Branch, Xi'an 710051, China;
    6. Xi'an Center of Geological Survey, Xi'an 710054, China
  • Received:2018-10-11 Revised:2018-12-16 Online:2019-03-21 Published:2019-03-21

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Abstract: In the process of drilling,hydration occurs when the drilling fluid contacts with the surrounding rock of the wellbore, which will lead to the deformation of shaft wall and cause the occurrence of accidents such as sidewall necking, collapse and cracking. According to the theory of elastic-plastic mechanics, rock mechanics and the maximum tensile stress criterion, the shale fracture pressure model was established on the basis of Huang's model,considering the effects of additional stress field caused by the percolation of drilling fluids in rock pores of the well wall rock, rock porosity and the fluid hydration. According to field fracturing experiment data and triaxial compression test results of shale cores with different water contents,the prediction value of shale fracture pressure,and the relation curves of shale water contents with tensile strength and the fracture pressure were obtained. The results show that the error of this model is 3.65% compared with the measured value,which means that the predicted value is closer to the measured fracture pressure,and both the fracture pressure and tensile strength decrease with the increase of water contents. It shows that the water softens the shale and reduces its mechanical properties.

Key words: shale, fracture pressure, hydration, seepage, water content

CLC Number: 

  • TE21
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