Borehole breakdown pressure with drilling fluids - II. Semi-analytical solution to predict borehole breakdown pressure

N. Morita*, G. F. Fuh, A. D. Black

*この研究の対応する著者

    研究成果: Article査読

    31 被引用数 (Scopus)

    抄録

    The fracture initiation and propagation experiments discussed in Part I revealed that three distinct zones exist around a fracture tip. They are the fracture process zone, the non-invaded and the dehydrated gel zone. These three zones significantly increase wellbore breakdown pressure and fracture propagation resistance under a relatively large in situ stress. With the assumption that wellbore pressure is sealed at the inlet of the dehydrated mud zone, a semi-analytical model of a fractured, inclined borehole is developed for a general plane strain condition. The model predicts that when drilling fluid is used as an injection fluid, borehole breakdown pressure is highly dependent on the formation Young's modulus, the in situ stress, the wellbore size, and type of the drilling fluids, although conventional theories have not included all these.

    本文言語English
    ページ(範囲)53-69
    ページ数17
    ジャーナルInternational Journal of Rock Mechanics and Mining Sciences and Geomechanics
    33
    1
    出版ステータスPublished - 1996

    ASJC Scopus subject areas

    • 経済地質学
    • 工学(全般)
    • 地球惑星科学(全般)
    • 環境科学(全般)

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