Influences of anisotropic mechanical properties in the hydraulic fracturing design in shale reservoirs
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Shale Gas Development Technical Service Company, SSC Jianghan, Wuhan Hubei 433100, China

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TE32;TE24

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    Abstract:

    Rock properties and in-situ stress can provide basic information for stimulated reservoir volume, and they affect fracture propagation evidently. Since shale has well developed lamination, the conventional methods with sonic velocity data, without considering special shale anisotropy, always express apparent error. A transverse isotropic model was presented to illustrate the unique rock properties of shale and a novel stress calculation method was investigated. The differences in rock mechanical parameters between isotropic model and anisotropic model were analyzed, and conversion of dynamic and static mechanical parameters was also presented. It was found the young’s modulus and the stress were greater than those from the conventional methods. The influence of initiation pressure from the anisotropic model was more obvious than that from the isotropic model. Fracturing simulation was performed with fracturing optimization software for shale formation in Jiaoshiba, Fuling. Numerical results show the fracture width is impacted noticeably and the anisotropy model underestimates the fracture height growth, which can provide technology support for in-situ fracturing treatment.

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History
  • Received:April 28,2021
  • Revised:September 11,2021
  • Adopted:October 28,2021
  • Online: April 29,2022
  • Published: March 10,2022