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Diverters are mainly used in off-shore<br />
drilling.<br />
On shore they are rare in use: mainly in<br />
drilling for the conductor when the well<br />
is to be with total depth over 6000 m.<br />
That is because there is not other<br />
preventer that will enable the passage<br />
of the bit of 660,4 mm (26“) diameter,<br />
that is used to drill the hole for casing<br />
with diameter of 508 mm (20“).
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