Improved understanding of acid wormholing in carbonate reservoirs through laboratory experiments and field measurements

Robert C. Burton, Manabu Nozaki, Nola R. Zwarich, Kenji Furui

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

    1 Citation (Scopus)

    Abstract

    A comprehensive study on wormholing has been conducted to improve the understanding of matrix acidizing in carbonate reservoirs. This work is a continuation of previous work (Furui et al. 2012a, 2012b). An analysis of additional experimental results as well as field measurements is provided to reinforce and extend the wormhole penetration model and productivity benefits provided by Furui et al. (2012b). A series of small block tests and one large block test under geomechanical stresses has been conducted to characterize wormholing in outcrop chalk samples. In addition, field data including acid pumping data as well as post-stimulation pressure falloff data has been collected and analyzed to evaluate stimulation effectiveness. Pressure buildup data from stimulated wells has also been analyzed to evaluate the sustainability of the acid induced skin benefits. Production logging data has been used to investigate whether created wormhole networks have remained stable or have collapsed under production stresses. To statistically analyze the data more comprehensively, the new data was also compared to the data from other field data available in the literature. The following conclusions are drawn from an analysis of the laboratory data and field data: 1) a skin value of −4 is achievable in carbonate reservoirs by matrix acidizing, 2) the negative acid skin is relatively stable under production stresses, 3) the wormhole penetration model is proven to successfully simulate matrix acidizing processes in both laboratory scale and field scale work, 4) the small and large block laboratory tests re-confirmed wormholing efficiency which was discussed as a scale effect in previous studies, 5) an understanding of the possible range of wormhole penetration has allowed us to improve field acid treatments and reduce the risk of connecting to water. This comprehensive study includes acid linear core flooding tests, small block tests, large block tests and field measurements to thoroughly analyze acid wormholing in carbonate rock. The database can be very useful information for understanding, benchmarking and optimizing future completion/stimulation design.

    Original languageEnglish
    Title of host publicationSPE Annual Technical Conference and Exhibition 2018, ATCE 2018
    PublisherSociety of Petroleum Engineers (SPE)
    Volume2018-September
    ISBN (Electronic)9781613995723
    Publication statusPublished - 2018 Jan 1
    EventSPE Annual Technical Conference and Exhibition 2018, ATCE 2018 - Dallas, United States
    Duration: 2018 Sep 242018 Sep 26

    Other

    OtherSPE Annual Technical Conference and Exhibition 2018, ATCE 2018
    CountryUnited States
    CityDallas
    Period18/9/2418/9/26

    Fingerprint

    Carbonates
    Acids
    Skin
    Experiments
    Benchmarking
    Sustainable development
    Productivity
    Rocks
    Water

    ASJC Scopus subject areas

    • Fuel Technology
    • Energy Engineering and Power Technology

    Cite this

    Burton, R. C., Nozaki, M., Zwarich, N. R., & Furui, K. (2018). Improved understanding of acid wormholing in carbonate reservoirs through laboratory experiments and field measurements. In SPE Annual Technical Conference and Exhibition 2018, ATCE 2018 (Vol. 2018-September). Society of Petroleum Engineers (SPE).

    Improved understanding of acid wormholing in carbonate reservoirs through laboratory experiments and field measurements. / Burton, Robert C.; Nozaki, Manabu; Zwarich, Nola R.; Furui, Kenji.

    SPE Annual Technical Conference and Exhibition 2018, ATCE 2018. Vol. 2018-September Society of Petroleum Engineers (SPE), 2018.

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

    Burton, RC, Nozaki, M, Zwarich, NR & Furui, K 2018, Improved understanding of acid wormholing in carbonate reservoirs through laboratory experiments and field measurements. in SPE Annual Technical Conference and Exhibition 2018, ATCE 2018. vol. 2018-September, Society of Petroleum Engineers (SPE), SPE Annual Technical Conference and Exhibition 2018, ATCE 2018, Dallas, United States, 18/9/24.
    Burton RC, Nozaki M, Zwarich NR, Furui K. Improved understanding of acid wormholing in carbonate reservoirs through laboratory experiments and field measurements. In SPE Annual Technical Conference and Exhibition 2018, ATCE 2018. Vol. 2018-September. Society of Petroleum Engineers (SPE). 2018
    Burton, Robert C. ; Nozaki, Manabu ; Zwarich, Nola R. ; Furui, Kenji. / Improved understanding of acid wormholing in carbonate reservoirs through laboratory experiments and field measurements. SPE Annual Technical Conference and Exhibition 2018, ATCE 2018. Vol. 2018-September Society of Petroleum Engineers (SPE), 2018.
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