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。
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。
when the axial residual stress exists, the stretching stress degrades the collapsing strength of the casing pipe whereas the crushing stress enhances that of the casing pipe.
当石油套管上存在轴向残余应力时,拉应力使石油套管的抗挤毁强度降低,而压应力使石油套管的抗挤毁强度有所提高;