Lithologic Reservoirs ›› 2015, Vol. 27 ›› Issue (2): 109-113.doi: 10.3969/j.issn.1673-8926.2015.02.017

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Calculation model of breakdown pressure in shale formation

YAN Xiangyang 1,HU Yongquan 2,LINan 3,SHEN Beibei4   

  1. 1. ENTI ， Chengdu 610000 ， China ； 2. College of Petroleum Engineering ， Southwest Petroleum University ， Chengdu 610500 ， China ；3. Research Institute of Engineering and Technology ， Northwest Oilfield Company ， Sinopec ， Urmuqi 830000 ， China ；4. Research Institute of Engineering and Technology ， Huabei Oilfield Company ， Sinopec ， Zhengzhou 450000 ， China
  • Online:2015-03-03 Published:2015-03-03

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Abstract:

It is very important to predict formation fracture pressure accurately for successful hydraulic fracturing. Calculating the fracture pressure in shale formation is different from that in common formations as a result of changes of mechanical properties due to hydration, so the calculation method of common formations cannot be applied to mud shale formation and an in-depth research should be made on the calculation method of fracture pressure in shale formation. Therefore, based on theories of elastic mechanics and rock mechanics, considering the effect of hydration on the wellbore stress field, this paper applied maximum tensile stress criterion to establish a new model for calculating fracture pressure by taking hydration stress into account. Besides, this paper carried out calculation examples by using the established model combined with two ways to calculate hydration stress of shale. The result shows that the fracture pressure in shale formation with hydration stress considered is much closer to the fracture pressure in actual formation than that not considered. Hence, this calculation model provides a reference basis for fast predicting the formation fracture pressure.

Key words: sedimentary characteristics, sandstone reservoir, Chang 101 stage, Yanchang Formation, Ordos Basin

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