目前,套管柱设计中使用的双轴应力计算法,是用图表和公式的反复试算法。由于图解法依赖图表,所以使用不便,且计算结果的准确性亦受图表精度及图表使用者熟练程度的直接限制。因此,部分套管柱设计中未考虑双轴应力计算,从而导致材料浪费或固井施工不安全。本文叙述一种精度足够、计算简便的双轴应力计算法。 At present, the biaxial stress calculation method used in casing string design is a trial and error method using charts and formulas. As the graphical method relies on the chart, it is inconvenient to use and the accuracy of the calculation results is directly limited by the accuracy of the chart and the proficiency of the chart user. As a result, biaxial stress calculations are not considered in some casing string designs, resulting in material waste or unsafe cementing practices. This article describes a biaxial stress calculation method with sufficient accuracy and simple calculation.