其次，采用有限元方法，研究了非均匀地应力条件下蠕变地层中套管的载荷。
Secondly, due to the difficulty of the analytical method in treating non-uniform in-situ stresses, finite element method is used instead.
其次，采用有限元方法，研究了非均匀地应力条件下蠕变地层中套管的载荷。
Secondly, due to the difficulty of the analytical method in treating non-uniform in-situ stresses, finite element method is used instead.
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