Types Of Casing In Drilling

In General, there are six casing types used in drilling Casing Design in all onshore and offshore wells which are as follows: - Structural Casing or Drive Pipe - Conductor Casing - Surface Casing - Intermediate or Protective Casing - Production Casing - Casing liner Structural Casing or Drive Pipe Type This string of casing is used to provide initial hole support close to the surface and will generally vary in length from about 30 to 300 feet. Conductor Casing Type This string of casing in some areas may be the first casing string set and cemented. In others, particularly offshore, it is the first string of casing that provides any protection against formation pore pressures. Surface Casing Type This type of casing which used in drilling wells serves several purposes such as to allow the flow to be contained by the blowout preventers. Intermediate Casing Type In Drilling This casing string is used to isolate problem zones.