Acid-treatment effects on openhole stability in limestone

Nobuo Morita, Tomoki Doi, Takanori Kinoshita

    Research output: Contribution to journalArticlepeer-review


    Openhole completions in limestone without a slotted or perforated liner became popular. Unlike other formations, borehole failure in limestone is induced by shear failure after pore collapse. An acid treatment enlarges the borehole and creates a wavy borehole surface. The acidized zone can contain wormholes or enlarged pores. However, since the Young's modulus also is reduced, the reduction of rock strength does not reduce borehole stability significantly. Normally, because limestone has a relatively high UCS, it is likely that a protective slotted or perforated liner can be deleted for openhole completions.

    Original languageEnglish
    Pages (from-to)59-60
    Number of pages2
    JournalJPT, Journal of Petroleum Technology
    Issue number10
    Publication statusPublished - 2002 Oct

    ASJC Scopus subject areas

    • Chemical Engineering(all)
    • Earth and Planetary Sciences (miscellaneous)
    • Energy Engineering and Power Technology
    • Fuel Technology


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