What 'C' term from oil piping refers to heavy steel pipe used to seal off fluids from the hole, or to keep the hole from caving in?

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Oil is measured in barrels, which is equal to 42 US gallons or 159 liters.

Venezuela leads the world with 300.9 billion barrels of oil reserves – a 17.8 per cent share of global reserves.


1. What 'C' term from oil piping refers to heavy steel pipe used to seal off fluids from the hole, or to keep the hole from caving in?