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

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

    Research output: Contribution to journalArticle

    28 Citations (Scopus)

    Abstract

    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.

    Original languageEnglish
    Pages (from-to)53-69
    Number of pages17
    JournalInternational Journal of Rock Mechanics and Mining Sciences and Geomechanics
    Volume33
    Issue number1
    Publication statusPublished - 1996

    Fingerprint

    Drilling fluids
    drilling fluid
    Boreholes
    borehole
    fracture propagation
    in situ stress
    fracture initiation
    fluid injection
    Young modulus
    plane strain
    Analytical models
    Gels
    Elastic moduli
    mud
    gel
    Fluids
    Experiments
    experiment

    ASJC Scopus subject areas

    • Economic Geology
    • Engineering(all)
    • Earth and Planetary Sciences(all)
    • Environmental Science(all)

    Cite this

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    abstract = "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.",
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    AB - 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.

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