By means of these expressions, formulas for calculating the axial and radial forces on the casing are derived and then the influence of steam flooding on casing strength is qualitatively analyzed.

• 根据这些表达式进一步推导套管轴向力和径向力的计算公式,然后根据这些公式定性地分析注蒸汽采油对套管强度的影响。