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地层外挤载荷是通过水泥石传递到套管上的，水泥石性能对外挤载荷传递的影响规律，揭示了套管外挤载荷与水泥石性能之间的关系。根据弹性体厚壁筒变形方程，引入了外挤载荷传递系数k，结合水泥石力学性能实验结果，就水泥石性能对套管外挤载荷传递的影响规律进行了探讨。研究表明，使用外加剂提高水泥石弹性模量、适当增加水泥石厚度（控制在2．54cm左右），有利于降低套管外挤载荷，增加套管的安全程度。

Influence of Bond Cement Property on Casing External Collapse Load

Formation external collapse load is transferred to the casing through bond cement.The law of the influence of bond cement property on external collapse load transfer reveals the relation between both of them.On the basis of elastic body thick-walled cylinder deformation equation and of introducing an external collapse load transfer coefficient k ,a discussion on the law of the influence of bond cement property on casing external collapse load transfer is carried out in combination with the experimental results of bond cement mechanical property.The research indicates that it is beneficial to decreasing casing external collapse load and increasing casing safety to raise the elastic modulus of bond cement by use of additive and increase bond cement thick (maintaining about 2.54cm).