海洋天然气水合物强度准则适用性分析
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1.中海油研究总院有限责任公司;2.东北石油大学

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TE242

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南方海洋科学与工程广东省实验室(湛江)资助项目(编号:ZJW-2019-03);国家重点研发计划课题(编号:2018YFC0310205)


Analysis on the Applicability of Marine Gas Hydrate Strength Criteria
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1.CNOOC Research Institute;2.(1. CNOOC Research Institute

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    摘要:

    为分析常三轴压缩条件下不同饱和度天然气水合物在不同围压下强度破坏准则的适用性,基于Mohr-Coulomb、Mogi-Coulomb、Hoek-Brown、广义Hoek-Brown和Drucker-Prager准则,结合天然气水合物的应力-应变曲线,进行天然气水合物强度拟合。结果表明,Mogi-Coulomb准则和Drucker-Prager强度准则计算值与实验值平均误差率小于2%,拟合曲线相关系数大于0.99,表明这两种强度准则与实验结果具有较高的一致性,而Hoek-Brown准则拟合曲线相关系数小于0.95,在天然气水合物低围压下并不适用。研究结果可为天然气水合物井壁稳定研究,保障水合物开采安全进行,提供理论参考。

    Abstract:

    In order to analyze the applicability of the strength failure criteria of gas hydrates with different saturations under different confining pressures under constant triaxial compression, based on the Mohr-Coulomb, Mogi-Coulomb, Hoek-Brown, generalized Hoek-Brown and Drucker-Prager criteria, combined the deviator stress-strain curve of natural gas hydrate under low confining pressure is used to fit the strength of natural gas hydrate. The results show that the average error rate between the calculated values of the Mogi-Coulomb criterion and the Drucker-Prager strength criterion and the experimental value is less than 2%, and the correlation coefficient of the fitted curve is greater than 0.99, indicating that these two strength criteria have high consistency with the experimental structure. -Brown criterion fitting curve correlation coefficient is less than 0.95, which is not applicable under low confining pressure of natural gas hydrate. The research results can provide a theoretical reference for the research on the stability of natural gas hydrate wellbore and ensure the safety of hydrate mining.

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周云健,何玉发,胡乔波,等. 海洋天然气水合物强度准则适用性分析[J]. 科学技术与工程, , ():

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  • 收稿日期:2021-12-08
  • 最后修改日期:2022-04-21
  • 录用日期:2022-04-30
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