对己经下入了C110油套管的井，防止后期作业诱发裂纹至关重要，新的设计方法对油气田在油套管的选材上具有重要参考价值。
For the well with C110, it is important to prevent cracks in late workings. So this new design method provides great reference value for Wells to choose proper casing material.
晚上完成作业的最后期限是几点？
在油田开采中后期，随着油田开发程度的加深，措施作业边际产量递减，措施作业边际费用递增，措施作业增量边际成本递增。
In the middle-late stages of production, as the deepening of the oil field development, the marginal operation output decrease, the cost increases, and the investment increase, too.
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