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In-Situ Stress Measurements at the Utah Frontier Observatory for Research in Geothermal Energy (FORGE) Site

Author

Listed:
  • Pengju Xing

    (Energy & Geoscience Institute, University of Utah, Salt Lake City, UT 84108, USA)

  • John McLennan

    (Department of Chemical Engineering, University of Utah, Salt Lake City, UT 84112, USA)

  • Joseph Moore

    (Energy & Geoscience Institute, University of Utah, Salt Lake City, UT 84108, USA)

Abstract

A scientific injection campaign was conducted at the Utah Frontier Observatory for Research in Geothermal Energy (FORGE) site in 2017 and 2019. The testing included pump-in/shut-in, pump-in/flowback, and step rate tests. Various methods have been employed to interpret the in-situ stress from the test dataset. This study focuses on methods to interpret the minimum in-situ stress from step rate, pump-in/extended shut-in tests data obtained during the stimulation of two zones in Well 58-32. This well was drilled in low-permeability granitoid. A temperature of 199 °C was recorded at the well’s total depth of 2297 m relative to the rotary Kelly bushing (RKB). The lower zone (Zone 1) consisted of 46 m of the openhole at the toe of the well. Fractures in the upper zone (Zone 2) were stimulated between 2123–2126 m measured depths (MD) behind the casing. The closure stress gradient variation depended on the depth and the injection chronology. The closure stress was found to increase with the pumping rate/volume. This stress variation could indicate that poroelastic effects (“back stress”) and the presence of adjacent natural fractures may play an important role in the interpretation of fracture closure stress. Further, progressively increasing local total stresses may, consequently, have practical applications when moderate volumes of fluid are injected in a naturally fractured or high-temperature reservoir. The alternative techniques that use pump-in/flowback tests and temperature signatures provide a valuable perspective view of the in-situ stress measurements.

Suggested Citation

  • Pengju Xing & John McLennan & Joseph Moore, 2020. "In-Situ Stress Measurements at the Utah Frontier Observatory for Research in Geothermal Energy (FORGE) Site," Energies, MDPI, vol. 13(21), pages 1-20, November.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:21:p:5842-:d:442131
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    Citations

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    Cited by:

    1. Guangchao Zhang & You Li & Xiangjun Meng & Guangzhe Tao & Lei Wang & Hanqing Guo & Chuanqi Zhu & Hao Zuo & Zhi Qu, 2022. "Distribution Law of In Situ Stress and Its Engineering Application in Rock Burst Control in Juye Mining Area," Energies, MDPI, vol. 15(4), pages 1-17, February.
    2. Mohamed Adel Gabry & Ibrahim Eltaleb & Mohamed Y. Soliman & Syed M. Farouq-Ali, 2023. "A New Technique for Estimating Stress from Fracture Injection Tests Using Continuous Wavelet Transform," Energies, MDPI, vol. 16(2), pages 1-29, January.
    3. Maria Vicidomini & Diana D’Agostino, 2022. "Geothermal Source Exploitation for Energy Saving and Environmental Energy Production," Energies, MDPI, vol. 15(17), pages 1-5, September.

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