Casing wear is the inevitable existing appearance in drilling.

套管磨损是钻井过程中必然存在的现象.

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Casing wear problem can't be neglected during the drilling of the deep & ultra - deep well.

在深井 、 超深井钻井过程中,套管磨损是个不容忽视的问题.

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In deep drilling process, casing wear is the problem that cannot be ignored.

在深井、超深井钻井过程中, 套管磨损有可能导致套管封隔失效和油气井的早期报废.

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