For a well producing from reservoir with bottom water and gas cap, the water and gas avoidances must lie taken into consideration for its position of optimum perforation.
气顶底水油藏油井射孔时既要考虑避水，又要考虑避气，因此存在一个最佳射开位置的问题。
The optimum position of a longitudinal stiffener as well as an approximate expression for computing the critical rigidity of the stiffener have been presented for design reference.
提出了合理的加劲位置以及劲条临界刚度的近似计算公式，可供设计参考使用。
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