作为第四强度理论的近似计算，目前在套管柱强度设计中广泛应用双向应力椭圆理论。
The Bilateral Stress Elliptic(ellipse of plasticity) Theory is widely used in casing strength designing, as an approximate alternative to the four th strength theory.
套管一旦发生粘扣，直接影响到套管柱的密封性能和连接强度。
The gluing deteriorates seal performance and connection strength of casing directly.
传统的套管柱设计中，套管只进行强度设计。
In conventional casing string design, only casing strength is considered.
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