Serious casing wear greatly reduces the collapsing strength and corrosion life.
套管磨损严重时，将使套管的抗挤毁能力和腐蚀寿命大大下降。
To solve this problem, a special casing - TP130TT high collapsing strength heavy casing has been developed.
针对这一问题，开发了一种特殊套管——TP130 TT高抗挤厚壁套管。
The shot diameter, shot density and shot phasing related to the collapsing strength coefficient are analyzed, and the result is helpful to the perforation optimum design.
利用推导的抗挤强度系数理论公式分析孔径、孔密及相位角的变化对其抗挤强度系数的影响，其结果为优化射孔设计提供了简便的方法。
The shot diameter, shot density and shot phasing related to the collapsing strength coefficient are analyzed, and the result is helpful to the perforation optimum design.
利用推导的抗挤强度系数理论公式分析孔径、孔密及相位角的变化对其抗挤强度系数的影响，其结果为优化射孔设计提供了简便的方法。
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