Casing and Tubing

Casing and tubing strings are the main parts of the well construction. All wells drilled for the purpose of oil or gas production (or injecting materials into underground formations) must be cased with material with sufficient strength and functionality.

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Sizes

Diameter :from 4 1/2 inch to 20 inch （48.26mm - 508mm) ( Casing)
Size: OD: 48.26mm-114.3mm ( Tubing)
Nominal Weight: from 9.5 lb/ft to 169 lb/ft, from 9.5 ppf to 169 ppf
Lenght: R1, R2, R3

Types

Seamless casing (small-diameter, medium-diameter)
ERW casing (medium-diameter)
Casing nipple
Casing coupling

Grades

API 5CT H40
API 5CT J55
API 5CT K55
API 5CT M65
API 5CT N80 (1,Q)
API 5CT L80 (9Cr,13Cr)
API 5CT C90
API 5CT T95
API 5CT P110
API 5CT Q125

Application

Oil well extracting casing
Borehole casing
Borewell casing

Connections

SC: Short round thread casing
LC: Long ound thread casing
BC: Buttress thread casing
NU: Non-upset tubing
EU: External upset tubing
IJ: Integral tubing connections

Colour Code

Grade	Colour Code Pipe	Heat Treatment	Characteristics and Recommendation
J55		Normalized, Normalized and Tempered or quenched and Tempered	Tubing & Casing for general service
K55		Normalized, Normalized and Tempered or quenched and Tempered	Casing for general service
N80 Type 1		Normalized or Normalized and Tempered	Tubing & Casing for general service
N80 Type Q		Quenched and Tempered	Tubing & Casing for general service
L80 Type 1		Quenched and Tempered	Tubing & Casing with controlled yield range for sour well service
L80 9 Cr		Quenched and Tempered	Tubing & Casing for oil & gas wells affected by CO2 corrosion
L80 13 Cr		Quenched and Tempered	Tubing & Casing for oil & gas wells affected by CO2 corrosion
C90 Type 1		Quenched and Tempered	Hight strength Tubing & Casing with controlled yield range for service in hydrogen sulphide environments
R95		Quenched and Tempered	High strength Tubing & Casing with conntrolled yield range
T95 Type 1		Quenched and Tempered	High strength Tubing & Casing with controlled yield range for service in hydrogen sulphide environments
C110		Quenched and Tempered	High strength Casing with controlled yield range for service in hydrogen sulphide environments
P110		Quenched and Tempered	High strength Tubing & Casing for high pressure service
Q125 Type 1		Quenched and Tempered	Casing for deep well service