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Rotational preventers are<br />
used:<br />
For drilling in layers that are<br />
suspected to cause possible<br />
kick off.<br />
When drilling on the balance<br />
or under balanced (drilling<br />
the rocks of great<br />
permeability or porosity; to<br />
avoid pollution with mud).<br />
When using indirect<br />
circulation.<br />
When the drilling is done<br />
using air or gas.<br />
Rotational<br />
preventers
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