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    Application of the Modified Borehole Wall Stress Relief Method in Deep Vertical Boreholes

    Source: International Journal of Geomechanics:;2024:;Volume ( 024 ):;issue: 008::page 04024151-1
    Author:
    Qin Yuqiao
    ,
    Tang Hua
    ,
    Wu Zhenjun
    DOI: 10.1061/IJGNAI.GMENG-9171
    Publisher: American Society of Civil Engineers
    Abstract: The in situ stress conditions of reservoirs are the fundamental parameters for determining the arrangements of horizontal boreholes and assessing borehole stability, especially for the exploration and exploitation of unconventional oil and gas. The borehole wall stress relief method (BWSRM) is a new technique that can directly measure three-dimensional (3D) stress without any assumptions regarding the stress field. In deep vertical borehole situations, a new experiment is proposed to prevent electronic components from becoming damp while simultaneously maintaining borehole stability. The effect of drilling fluid pressure on the strain measurement of the stress relief processes is studied. The finite-element model (FEM) simulates the stress relief process and verifies the theoretical solutions under different testing depths. The results show that complete stress relief is impossible under deep vertical borehole conditions, and the wall drilling process changes the stress conditions of the measured points from modified plane strain to triaxial compression. Therefore, the data measured by the strain gauges cannot be directly imported into the original relationships between the measured strains and far-field stress. The comparisons between the original theoretical solutions and FEM results indicate that if the confining pressure is ignored, then the maximum error between the measured and real in situ stress components is over 35%. After correcting the estimated strain data using the proposed methods, the stress tensors obtained from theoretical equations are consistent with the natural stress tensors.
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      Application of the Modified Borehole Wall Stress Relief Method in Deep Vertical Boreholes

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4299178
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    • International Journal of Geomechanics

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    contributor authorQin Yuqiao
    contributor authorTang Hua
    contributor authorWu Zhenjun
    date accessioned2024-12-24T10:34:32Z
    date available2024-12-24T10:34:32Z
    date copyright8/1/2024 12:00:00 AM
    date issued2024
    identifier otherIJGNAI.GMENG-9171.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4299178
    description abstractThe in situ stress conditions of reservoirs are the fundamental parameters for determining the arrangements of horizontal boreholes and assessing borehole stability, especially for the exploration and exploitation of unconventional oil and gas. The borehole wall stress relief method (BWSRM) is a new technique that can directly measure three-dimensional (3D) stress without any assumptions regarding the stress field. In deep vertical borehole situations, a new experiment is proposed to prevent electronic components from becoming damp while simultaneously maintaining borehole stability. The effect of drilling fluid pressure on the strain measurement of the stress relief processes is studied. The finite-element model (FEM) simulates the stress relief process and verifies the theoretical solutions under different testing depths. The results show that complete stress relief is impossible under deep vertical borehole conditions, and the wall drilling process changes the stress conditions of the measured points from modified plane strain to triaxial compression. Therefore, the data measured by the strain gauges cannot be directly imported into the original relationships between the measured strains and far-field stress. The comparisons between the original theoretical solutions and FEM results indicate that if the confining pressure is ignored, then the maximum error between the measured and real in situ stress components is over 35%. After correcting the estimated strain data using the proposed methods, the stress tensors obtained from theoretical equations are consistent with the natural stress tensors.
    publisherAmerican Society of Civil Engineers
    titleApplication of the Modified Borehole Wall Stress Relief Method in Deep Vertical Boreholes
    typeJournal Article
    journal volume24
    journal issue8
    journal titleInternational Journal of Geomechanics
    identifier doi10.1061/IJGNAI.GMENG-9171
    journal fristpage04024151-1
    journal lastpage04024151-10
    page10
    treeInternational Journal of Geomechanics:;2024:;Volume ( 024 ):;issue: 008
    contenttypeFulltext
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