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Determination of In-Situ Stress and Geomechanical Properties from Borehole Deformation

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  • Hong Xue Han

    (Department of Petroleum Engineering, University of Wyoming, Laramie, WY 82071, USA)

  • Shunde Yin

    (Department of Petroleum Engineering, University of Wyoming, Laramie, WY 82071, USA)

Abstract

This paper proposes a cost-effective technique to determine geomechanical properties and in-situ stress from borehole deformation data. In this approach, an artificial neural network (ANN) is applied to map the relationship among in-situ stress, borehole size, geomechanical properties, and borehole displacements. The genetic algorithm (GA) searches for the set of unknown stresses and geomechanical properties that matches the objective borehole deformation function. Probabilistic recapitulation (PR) analysis is conducted after each ANN-GA modeling cycle and will be repeated with a reduced number of unknowns for the next ANN-GA modeling cycle until unequivocal results are achieved. The PR-GA-ANN method has been demonstrated by a field case study to estimate borehole size, Young’s modulus, Poisson’s ratio, and the two horizontal stresses using borehole deformation information reported from four-arm caliper log of a vertical borehole. The methodology effectively solves the issue of the multiple solutions (various rock mechanical properties and in-situ stresses combinations) for a certain borehole deformation. The case study also indicated that the calculated horizontal stresses are in reasonable agreement with the filed hydraulic fracture treatment observations and the reported regional stress study of the area.

Suggested Citation

  • Hong Xue Han & Shunde Yin, 2018. "Determination of In-Situ Stress and Geomechanical Properties from Borehole Deformation," Energies, MDPI, vol. 11(1), pages 1-13, January.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:1:p:131-:d:125590
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    References listed on IDEAS

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    1. Zhao, Yangsheng & Feng, Zijun & Xi, Baoping & Wan, Zhijun & Yang, Dong & Liang, Weiguo, 2015. "Deformation and instability failure of borehole at high temperature and high pressure in Hot Dry Rock exploitation," Renewable Energy, Elsevier, vol. 77(C), pages 159-165.
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    Cited by:

    1. Przemyslaw Michal Wilczynski & Andrzej Domonik & Pawel Lukaszewski, 2021. "Anisotropy of Strength and Elastic Properties of Lower Paleozoic Shales from the Baltic Basin, Poland," Energies, MDPI, vol. 14(11), pages 1-17, May.
    2. Yutong Chai & Zhuoheng Chen & Shunde Yin, 2023. "A Preliminary Analysis of In-Situ Stress at Mount Meager by Displacement Discontinuity Method with Topography and Tectonics Considered," Energies, MDPI, vol. 16(3), pages 1-25, January.
    3. 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.
    4. Hua Zhang & Shunde Yin & Bernt S. Aadnoy, 2019. "Numerical Investigation of the Impacts of Borehole Breakouts on Breakdown Pressure," Energies, MDPI, vol. 12(5), pages 1-23, March.
    5. Wei Meng & Chuan He, 2020. "Back Analysis of the Initial Geo-Stress Field of Rock Masses in High Geo-Temperature and High Geo-Stress," Energies, MDPI, vol. 13(2), pages 1-20, January.

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