Core-based horizontal or highly inclined well stability analysis for unconsolidated formations

Nobuo Morita, C. K. Ross

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    3 Citations (Scopus)

    Abstract

    The prediction of a safe mud weight is important when drilling highly inclined or horizontal wells through permeable, poorly consolidated formations. If the mud weight used to drill these types of wells is too high, differential sticking of the drill string will occur. If the mud weight is too low, it is possible that the well bore will collapse. The standard linear elasticity borehole stability analysis methods used by many in industry predicts an unnecessarily high mud weight to prevent borehole collapse,while the safe mud weight is significantly lower. This paper describes a new core-based well stability analysis for horizontal or highly inclined wells in weak formations. New procedures to measure core strength and deformation and the numerical procedure to calculate the well stability for a highly non-linear formation are discussed. Field data and experiences are also included to validate the non-linear borehole stability analysis.

    Original languageEnglish
    Title of host publicationProceedings - SPE Annual Technical Conference and Exhibition
    Editors Anon
    Place of PublicationRichardson, TX, United States
    PublisherPubl by Society of Petroleum Engineers (SPE)
    Pages187-200
    Number of pages14
    VolumeDelta
    Publication statusPublished - 1993
    EventProceedings of the SPE Annual Technical Conference and Exhibition. Part 2(of 5) - Houston, TX, USA
    Duration: 1993 Oct 31993 Oct 6

    Other

    OtherProceedings of the SPE Annual Technical Conference and Exhibition. Part 2(of 5)
    CityHouston, TX, USA
    Period93/10/393/10/6

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    ASJC Scopus subject areas

    • Geology
    • Geotechnical Engineering and Engineering Geology

    Cite this

    Morita, N., & Ross, C. K. (1993). Core-based horizontal or highly inclined well stability analysis for unconsolidated formations. In Anon (Ed.), Proceedings - SPE Annual Technical Conference and Exhibition (Vol. Delta, pp. 187-200). Publ by Society of Petroleum Engineers (SPE).