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Auto-Fill Ball
Float Check Valve
Auto-Fill Tube
Circulation Port
Figure 4 – Float Collar Utilized in the Macondo Well
As discussed above, the float collar was set at 18,115 feet measured depth,
within the primary hydrocarbon reservoir sands (see Figure 2, above). Typically,
an operator sets the float collar below the primary hydrocarbon sands to allow
for perforation of the pay zone without the need to drill out the float equipment
to get below the pay zone during the completion of the well. In addition, the
lower primary sand was less than 100 feet from the bottom of the production
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casing shoe. Normally, an operator would set the production casing shoe 200
to 300 feet below the primary sand to improve the chances of proper isolation of
the pay sand.
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