... Applications:Tubing is used for extracting petroleum and natural gas.Casing serves as Tubing and casingFeature:1)Standard:API SPEC 5CT2 ... )Applications:Tubing is used for extracting petroleum and natural gas.Casing serves as wall of well.3)Sizea.size of tubing ... ,8.35-9.75m,11.58-12.80mb.size of casing:4'',4 1/2'',5'',5 1/2'',7'',8 ... ,7.62-10.36m,10.36-14.63m Tubing and casing