Analysis of stress interference and geometry of hydraulic fractures based on the extended finite element method

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  • 1.Fracturing and Acidification Service Center of Research Institute of Petroleum Exploration & Development,PetroChina,Langfang 065007,China;
    2.Research Institute of Petroleum Exploration & Development,PetroChina,Beijing 100083,China

Received date: 2018-05-08

  Revised date: 2018-07-28

  Online published: 2019-08-27

Abstract

In order to study the stress interference between fractures and its effect on the fracture geometry during the multi-fracturing in horizontal wells,taking the fracture flow and fracturing fluid loss into consideration,variations of the horizontal in-situ stress and the length,the width before sand adding and the extension direction of fractures under different fracture spacing and positions at the same and different fracture initiation times were analyzed by numerical simulation based on extended infinite element method.Results show that the direction of the horizontal in-situ stress in the ellipsoidal regions around the fracture is changed by the induced stress caused by the fracturing fluid pressure.The unilateral distance of the effected region is approximately 1.5 times the length of the fracture.The direction of the horizontal stress on the tip of fractures is not effected.When two cracks initiated simultaneously,the extension direction of the two symmetrical cracks is “repulsive”,and the deflection angle decreases with the increase of the fracture spacing.The extension direction of two staggered fractures is “inter-attracting” and the width before sand adding is narrower than that of a single fracture.When two fractures initiate at different times,the extension direction of the latter fracture firstly is “inter-attracting” and then becomes “repulsive” with the increase of the fracture spacing and its length is inhibited by the former one.The width of the former fracture before sand adding is affected seriously by the latter one while its length becomes longer and there is a seriously asymmetrical expansion on both wings of the staggered fractures.

Cite this article

Xu Jia-xiang, Ding Yun-hong, Yang Li-feng, Wang Zhen, Liu Zhe, Gao Rui . Analysis of stress interference and geometry of hydraulic fractures based on the extended finite element method[J]. Natural Gas Geoscience, 2018 , 29(9) : 1356 -1363 . DOI: 10.11764/j.issn.1672-1926.2018.07.007

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