Casing is the major component of a well. Casing pipe is needed in many different aspects,such as Casing can maintain borehole stability.Casing can prevent contamination of water sand.Isolate water from producing formations. Control well pressures during drilling, production, and workover operations.
What’s more ? The casing pipes provides locations for the installation of
1) Blowout preventers
2) Wellhead equipment
3) Production packers
4) Production tubing
The cost of casing is a major part of the overall well cost, so selection of casing size, grade, connectors, and setting depth is a primary engineering and economic consideration.