The safety clamp prevents the tool string from being dropped downhole accidentally if the slips or elevators securing the string lose their grip.
如果卡紧管柱的卡瓦或吊卡失去了其抓力，则安全卡瓦可防止工具管柱意外地掉落井下。
The safety clamp prevents the tool string from being dropped downhole accidentally if the slips or elevators securing the string lose their grip.
如果卡紧管柱的卡瓦或吊卡失去了其抓力，则安全卡瓦可防止工具管柱意外地掉落井下。
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