Casing is one of the most critical well consumables with respect to timing. Total elapsed time for procurement of Oil Country Tubular Goods (OCTGs) varies from 6-18 months. This includes tendering procedures, placing of the purchase order, manufacturing and delivery to the required location.
Normal deliver-time from a mill once an order has been placed is in general, 3-4 months for API materials J55 and K55, 4-5 months for materials N80, L80, P110, and Q125, and six months for C95. Casing with premium connections requires approximately two weeks more . . .