CONSTITUTIVE EQUATION FOR NONLINEAR STRESS-STRAIN CURVES IN ROCKS AND ITS APPLICATION TO STRESS ANALYSIS AROUND A BOREHOLE DURING DRILLING.

Nobuo Morita, K. E. Gray

    Research output: Chapter in Book/Report/Conference proceedingChapter

    6 Citations (Scopus)

    Abstract

    The stress-strain behavior of Berea, Ohio, and Pecos sandstone was measured intensively under triaxial loading paths. Both compression and extension tests were performed at different pore fluid pressures. The characteristics of these modes were studied, and a nonlinear model was developed to represent the important characteristics, i. e. , the four modes, of the behavior of sandstones by means of a constitutive equation in such a way as to satisfy certain mathematical requirements. A finite element model using nonlinear stress-strain relationship was developed which simulates the stress state of a structure up to failure. The finite element model was used to predict fracture pressure around a borehole during drilling. The shape of the borehole is either circular or elliptic, and the tectonic stress is directional.

    Original languageEnglish
    Title of host publicationSociety of Petroleum Engineers of AIME, (Paper) SPE
    Place of PublicationDallas, Tex
    PublisherSoc of Pet Eng of AIME
    Publication statusPublished - 1980
    EventSoc Pet Eng AIME Pap SPE Presented at the Annu Fall Tech Conf and Exhib, 55th - Dallas, TX, USA
    Duration: 1980 Sep 211980 Sep 24

    Other

    OtherSoc Pet Eng AIME Pap SPE Presented at the Annu Fall Tech Conf and Exhib, 55th
    CityDallas, TX, USA
    Period80/9/2180/9/24

    ASJC Scopus subject areas

    • Engineering(all)

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  • Cite this

    Morita, N., & Gray, K. E. (1980). CONSTITUTIVE EQUATION FOR NONLINEAR STRESS-STRAIN CURVES IN ROCKS AND ITS APPLICATION TO STRESS ANALYSIS AROUND A BOREHOLE DURING DRILLING. In Society of Petroleum Engineers of AIME, (Paper) SPE Soc of Pet Eng of AIME.