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Home > Archive>Volume 48, Issue 12, 2020 >1696-1706. DOI:10.11908/j.issn.0253-374x.20127
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Elastoplastic Analytical Investigation of Mechanical Response of Wellbore in Methane Hydrate-bearing Sediments
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1.School of Aerospace Engineering and Applied Mechanics， Tongji University， Shanghai 200092， China;2.State Key Laboratory of Disaster Reduction in Civil Engineering， Tongji University， Shanghai 200092， China;3.School of Civil Engineering， Tianjin University， Tianjin 300350， China

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TE21

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    Abstract:

    When drilling in methane hydrate-bearing sediments， the variation of temperature and seepage pressure around the wellbore likely leads to the hydrate dissociation， reducing the safety of wellbore. The analytical solution for wellbore mechanical analysis is derived accounting for the ideal elastic-plastic behavior of the formation， the Mohr-Coulomb yield criterion and non-associated flow rule. Based on a steady-state axisymmetric plane strain model considering the effect of hydrate dissociation on temperature， seepage flow and mechanical property， the stress and displacement solutions are presented under unbalanced and overbalanced drilling conditions. The analytical solutions agree well with the results by numerical methods under the same assumptions， as well as the complex conditions. The results show that the increase of the size of dissociated region leads to the expanding of plastic zone obviously within a certain range. The size of plastic zone is decreased with the reduction of Young's modulus of dissociated region under unbalanced drilling condition， while the result is inverse under overbalanced drilling condition.

    Fig.1 Mechanical model for wellbore drilling in methane hydrate-bearing sediments
    Fig.2 Coupling relationship between mechanics, seepage and temperature field
    Fig.3 Models for stress and incremental displacement calculation
    Fig.4 Axisymmetric model in finite element method
    Fig.5 Comparison between analytical solution and finite element results
    Fig.6 Comparison between analytical solution and numerical solution under complex conditions
    Fig.7 Influence of drilling fluid pressure on stress and displacement under underbalanced drilling condition
    Fig.8 Influence of drilling fluid pressure on stress and displacement under overbalanced drilling condition
    Fig.9 Influence of the size of dissociation region on the radius of plastic zone
    Fig.10 Influence of the reduction of elastic modulus on stress and displacement under underbalanced drilling condition
    Fig.11 Influence of the reduction of elastic modulus on stress and displacement under overbalanced drilling condition
    Fig.12 Influence of the reduction of cohesive on plastic radius
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WANG Huaning, GUO Zhenyu, GAO Xiang, JIANG Mingjing. Elastoplastic Analytical Investigation of Mechanical Response of Wellbore in Methane Hydrate-bearing Sediments[J].同济大学学报(自然科学版),2020,48(12):1696~1706

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  • Received:April 17,2020
  • Online: December 31,2020
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