Oil Country Tubular Goods (OCTG) are pipes used in wells in oil and gas industries.
OCTG Tubing is used within the casing to convey the oil or gas to the ground surface, Tubing sizes from 1.050 to 4.5 inches O.D., wall thickness from 3.18 mm to 10.54 mm, material grade J55, K55, N80, L80, P110, etc., according to API SPEC 5CT Standard.