设备大修是维持简单再生产的重要手段，由于设备大修费用有限，导致设备欠修。
Equipments overhaul is an important methods in maintaining equipments operating, Because the overhaul cost is limited as result of equipments lack of repair.
为今后如何进一步保护好套管，节省大修费用，降低成本，提高经济效益等方面提出了建议。
Additionally, have put forward the Suggestions in protecting casing, saving workover fee, reducing costs and increasing economic benefits.
经标准化处理后，在确定时变参数估值的基础上，建立了大修费用多层递阶预测模型，并成功地实现了大修费用预测。
The Multi?layer hierarchical recursion model for equipment overhaul cost forecasting is successfully established in overhaul cost prediction.
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