1)Casing is the pipe as wall lining surface into the drilling inside by the ground, Between two pipes are connected by coupling.
2)Tubing is used to extracting petroleum and natural gas from a well casing serves as walls of a well.
Standard: API SPEC 5CT PSL1/PSL2
Outside Diameter: 60.32-608mm (2 3/8-20inch)
Wall Thickness: 4.24-16.13mm
1)Casing pipe: R1 (4.88-7.62m); R2 (7.62-10.36m); R3 (10.36-14.63m)
2)Tubing pipe: R1 (6.1-7.32m); R2 (8.53-9.75m); R3 (11.58-12.8m)
Group 1: All casing and tubing in Grades H40,J55,K55,N80-1,N80-Q and R95
Group 2: All casing and tubing in Grades C90,C110,L80-1,L80-9Cr,L80-13Cr,M65 and T95
Group 3: All casing and tubing in Grades P110
Group 4: All casing in Grades Q125