套管损坏会导致压力完整性破坏、生产油管磨损，甚至无法下入修井工具。
Casing impairment leads to loss of pressure integrity, pinching of production tubing, even an inability to lower workover tools.
气井修井作业中，常常遇到油管柱断掉、穿孔、腐蚀等严重问题，使修井作业中“压井”非常困难。
In workover operation, it was very difficult to carry out "Well control" owing to tubing string's being seriously corroded, bored and ruptured.
油田的修井作业机是维护和保证采油生产不可缺少的施工机械，其主要用途是修井提升或下放油管、抽油杆等。
The workover rig is a necessary device to maintain and ensure mining technics in the oil field, and its main application is to elevate or drop oil pipes and pumps.
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