Oil Country Tubular Goods (OCTG)
Oil country tubular goods (OCTG) is a family of seamless rolled products consisting of drill pipe, casing and tubing subjected to loading conditions according to their specific application. Corrosion resistance under sour service conditions is a very important OCTG characteristic, especially for casing and tubing.
OCTG is composed of:
– Drill pipe is heavy seamless tube that rotates the drill bit and circulates drilling fluid.
– 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 is pipe through which the oil or gas is transported from the well