A generic name given to tools that engage on the outer surface of a tubing string or tool assembly, generally for fishing purposes.
与油管柱或工具装置的外表面相接合的工具通称，一般用于打捞目的。
If the slips fail to hold the tool assembly, the dog collar will prevent the entire assembly form dropping through and being lost in the wellbore.
如果卡瓦未能固定工具组合，则爪环将会防止整个工具组合落井。
If the slips fail to hold the tool assembly, the dog collar will prevent the entire assembly form dropping through and being lost in the wellbore.
如果卡瓦未能固定工具组合，则爪环将会防止整个工具组合落井。
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