Do not make up or break out the bit on a single joint of DC. If this is absolutely necessary, always snub drill collar with the air tugger.
不要在一单根钻铤上卸钻头，如果确实需要这样做，要用气动绞车拉住钻铤。
Do not make up or break out the bit on a single joint of DC. If this is absolutely necessary, always snub drill collar with the air tugger.
不要在一单根钻铤上卸钻头，如果确实需要这样做，要用气动绞车拉住钻铤。
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