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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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Dog Collar Museum, Leeds Castle, Kent.
狗项圈博物馆，利兹城堡，肯特郡，英国。
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Dog Collar Museum, Leeds Castle, Kent.
狗项圈博物馆，利兹城堡，肯特郡，英国。
youdao