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Annular-type preventers<br />
employ a ring of reinforced<br />
synthetic rubber as a packing<br />
unit that surrounds the well<br />
bore to effect shutoff<br />
In the full-open position, the<br />
inner diameter of the packing<br />
unit equals the diameter of the<br />
preventer bore.<br />
A system for squeezing the<br />
ring of packing lets the<br />
operator reduce the diameter<br />
until it engages the pipe, tool<br />
joint, kelly or the full inner<br />
diameter of the preventer.<br />
The only way to close annulartype<br />
of preventers is by use of<br />
hydraulic pressure.<br />
Annular-type<br />
preventer (Hydril)
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