Journal of Jilin University(Earth Science Edition) ›› 2018, Vol. 48 ›› Issue (4): 1268-1276.doi: 10.13278/j.cnki.jjuese.20170053

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Establishment of Formation Shear Fracture Model by Logging Data

Liao Dongliang1,2, Zeng Yijin1,2   

  1. 1. State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development, Beijing 100101, China;
    2. Sinopec Research Institute of Petroleum Engineering, Beijing 100101, China
  • Received:2017-11-01 Online:2018-07-26 Published:2018-07-26
  • Supported by:
    Supported by National Natural Science Foundation of China (21427812,41474108) and Scientific and Technological Project of Sinopec (P17014-9)

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Abstract: The formation shear fracture model is an effective supplement to the extensional fracture model, which is helpful to improve the fracture mechanism of petroleum drilling and fracturing engineering. Using formation microScanner image (FMI) logging data we can determine the orientation, number and density of drilling induced fractures and shear fractures. Through the analysis of the theoretical research and influence factors on the shear fracture of shale formation and using the nonlinear assumption of internal friction coefficient and mineral content, we established the critical stress model of formation shear failure. It is found that the content of clay minerals, internal friction coefficient, cohesive strength and stress are the important factors for the shear fractures. Based on the statistical regression model between the internal friction coefficient (internal friction angle) and the shale content, the formation shear failure model is simplified, and the applicability of the model is enhanced. The actual data show that an inverse relationship exists between the critical stress calculated by the shear failure model and the number of drilling induced fractures. The actual data are in good agreement with the theoretical result.

Key words: formation microscanner image, shear fracture, extensional fracture, drilling induced fractures, internal friction angle

CLC Number: 

  • P631.8
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