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.
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.
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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