OCTG Supplier Oil country tubular goods (OCTG) is a type of seamless rolled product consisting of drill pipe, casing and tubing. Puwo provides a variety of OCTG as well as casing, tubing, drill pipe, oilfield pipe, drill collar, heavy weight drill pipe, slotted pipe, line pipe, coupling and pup joint, etc. Casing pipe: Casing pipe lines the borehole. It is subject to axial tension by its dead weight, internal pressure by fluid purging, and external pressure by surrounding rock formations. Tubing: Tubing is pipe through which the oil or gas is transported from the wellbore. Drill pipe: Drill pipe is heavy seamless tube that rotates the drill bit and circulates drilling fluid.