因生产需要，有时要对大套管井筒进行修井。
Sometimes, the work over operation must be done to large diameter cased bore hole for the need of production of the well.
在实验中，大套管实验工况的火焰稳定性比小套管要好。
In this experiment, the flame stability under large bushing is better than under small bushing.
计算结果表明，除了射孔附近外，套管不会发生大程度破坏。
The calculated results indicate that the casing will not be damaged severely except near the perforated holes.
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