The relationships among perforation diameter, density, phase and casing strength are clarified.
明确了射孔直径、密度及相位等与套管强度的关系。
The casing strength of collapse resistance is an important index of weighing the performance of casing strength.
套管抗挤强度是衡量套管强度性能的一项重要指标。
Since casing strength performance can be influenced by many factors, it is hard to confirm casing strength margin and its value.
套管强度性能受多种因素的影响，如何确定套管强度余量及其大小，是一个难题。
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