The casing grade has H40, J55, K55, M65, N80, L80, C90 , C95, T95, P110, Q125,V150 and so on. H40 is the lowest grade, the market use it rarely. The yield strength of J55 and K55 is the same level, the difference of them is that the tensile strength of K55 is higher than that of
Casing includes petroleum drill pipe , oil casing and oil -well tubing. Petroleum drill pipe is mainly used to connect the drill collar and drill at the same time transmits drilling power. Oil -well tubing mainly transfers the bottom of the oil and gas to the ground. Name Casing Pipe .