Oil Country Tubular Goods (OCTG) are pipes used in wells in oil and gas industries.
OCTG Casing is the structural retainer for the walls of oil and gas wells, Casing sizes from 4.5 to 20 inches O.D. , wall thickness from 5.21 mm to 15.88 mm, material grade J55, K55, N80, L80, P110, etc., according to API SPEC 5CT Standard.