API 5CT Oil Casing is a pipeline equipment used in oil and gas wells. It serves several critical purposes:
Wellbore Protection – The casing acts as a protective shell for the wellbore, preventing collapse and external damage. It withstands geological stresses and well pressures, maintaining the stability of the drilling hole.
Pressure Control – The casing helps control pore pressure and drilling pressure, directing them to the surface. This prevents blowouts and other safety hazards.
Conducting Oil & Gas – The casing serves as a conduit within the wellbore, bringing oil and gas from the bottom to the surface. Its high sealing efficiency ensures smooth flow of fluids and gases.
Formation Isolation – The casing isolates different fluids in various formations, preventing cross-contamination and mixing. This is crucial for efficient oil and gas extraction and production.
Wellbore Support – The structural strength of the casing supports the wellbore, preventing collapse and wellbore subsidence. It withstands formation pressure and the weight of wellbore fluids.
Grades of Casing pipe:
Sizes of Casing pipe:
Diameter :from 4 1/2 inch to 20 inch （48.26mm - 508mm)
Nominal Weight: from 9.5 lb/ft to 169 lb/ft, from 9.5 ppf to 169 ppf
Lenght: R1, R2, R3
Types of Casing pipe:
Seamless casing (small-diameter, medium-diameter)
ERW casing (medium-diameter)
Casing nipple
Casing coupling
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