International Commission on Irrigation & Drainage Commission Interationale des Irrigation et du Drainage



(5967) Churn drill, Cable-tool drill, Churn drilling, Churn method, Cable-tool drilling, Cable-tool method
A drill for drilling wells by the use of cable tools. The hole is drilled by a heavy bit that is alternately raised by a cable and allowed to drop, breaking and crushing the material which it strikes. Such material is removed from the hole by bailing or sand pumping.

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