blank-casing bit 套管底部装用的环状钻头坯
casing shoe bit 套管底金刚石钻头
casing bit
套管一点
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Then a few more hundred feet is drilled with a narrower drill bit and then the narrower casing is run and cemented in.
FORBES: The Fracking Solution Is A Good Cement Job
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