Entity: reverse circulation drilling
URI: https://data.geoscience.earth/ncl/DrillingMethod/reverseCirculationDrilling
Type: Concept
no description supplied
experimental
| alt label |
RC
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| broader |
percussion drilling
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| definition |
The drilling mechanism for reverse circulation (RC) drilling is a pneumatic reciprocating piston known as a "hammer" driving a tungsten-steel drill bit. Compressed air passes down to the drill bit along the annular space between an outer and inner drill rod to return to the surface carrying drill cuttings. This is the reverse of the air path employed in normal ‘open hole’ rotary percussion drilling (including RAB drilling). At the top of the hole, the air and drill cuttings are passed through a cyclone to collect the cuttings for sampling. The RC drilling technique prevents the upcoming sample from being contaminated with material from the wall of the hole above the sampling depth. RC drilling utilises much larger rigs and machinery and depths of up to 500 metres are routinely achieved.
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| notation |
2.4
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| pref label |
reverse circulation drilling
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| source |
reverse circulation .28 rC.29 drilling
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| type |
Concept
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| date accepted |
23 janv. 2019 11:20:30.883
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| date submitted |
23 janv. 2019 11:20:10.723
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| definition |
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| item class |
Concept
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| label |
reverse circulation drilling
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| notation |
reverseCirculationDrilling
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| register |
drilling method
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| status |
status experimental
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| submitter |
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| type |
register item
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| version info |
2
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