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考慮熱固耦合作用的高溫高壓井井筒完整性分析

Integrity analysis of high temperature and high pressure wellbores with thermo-structural coupling effects

  • 摘要: 以高溫高壓井套管-水泥環-地層為研究對象,建立套管-水泥環-地層組合系統的熱固耦合模型,結合邊界條件和連續條件,得到相應的應力解析解,并與有限元結果進行對比,驗證了解析方法的計算精度.通過分析熱固耦合作用下的解析解和不考慮熱載荷的解析解,發現熱載荷對整體等效應力的影響較大.采用Mises、Drucker-Prager及Mohr-Coulomb屈服準則定義失效系數評價套管-水泥環-地層組合系統的井筒完整性.討論了水泥環彈性模量、泊松比、非均勻地應力系數、地層溫度、套管內壓等參數對套管內壁、水泥環內壁及第一、二膠結面失效系數的影響.上述因素對套管內壁、水泥環內壁及第一、二膠結面失效系數均有影響;第一膠結面失效系數較高,對井筒完整性影響較大.

     

    Abstract: Taking a composite system of casing-cement sheath-formation in a high temperature and high pressure oil well as the research object,a thermo-structural coupling model is constructed and its theoretical solution is obtained by considering contact,continuity and boundary conditions. The theoretical solution is very accurate in comparison with FEM solution. Comparing the theoretical solutions with thermo-structural coupling effects and without thermal load,it is indicated that thermal load has much greater influence on the equivalent stress. Failure coefficient,which is used to analyze structure integrity,is defined by Mises,Drucker-Prager and Mohr-Coulomb yield criteria. The factors of elastic modulus,Poisson's ratio,nonuniform in-situ stress coefficient,formation temperature and casing pressure are discussed by considering the failure coefficient distribution of casing-cement sheath formation. The results show that the above factors have great effect on the failure coefficient distribution. The failure coefficient of the 1st cementation plane is greater than that of other planes and its influence on wellbore integrity is large.

     

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