Drilling Industry Glossary
fault
filtrate alkalinity
fine LCM
fish
fishing
float collar
float shoe
floorhand
formation
fourble
fracture gradient
fracture pressure
friction
friction factor (F.F.)
funnel viscosity
Float Collar
A special coupling device inserted one or two joints above the bottom of the casing string that contains a check valve to permit fluid to pass downward but not upward through the casing. The float collar prevents drilling mud from entering the casing while it is being lowered, allowing the casing to float during its descent and thus decreasing the load on the derrick or mast.
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