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<strong>Well</strong> head<br />
The top of a casing head<br />
has a cone-shaped bowl<br />
that holds the casing<br />
hanger.<br />
A casing hanger is a set of<br />
slips that grips and supports<br />
a casing string.<br />
Metal and rubber packing<br />
rings fit over the slips to<br />
complete the casing hanger<br />
assembly and provide an<br />
annular seal.<br />
Threaded or flanged outlets<br />
on the side of the casing<br />
head allow access to the<br />
sealed annulus for pressure<br />
gauges that warn of casing<br />
leaks.
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