Selecting the right casing size is one of the most consequential decisions in well design. Get it wrong and you either can't run the completion tools you need (too small a drift), or you've over-engineered the string and added unnecessary cost and hookload to the program. This page provides complete

Production Tubing: Sizes, Grades & Specifications Selection GuideProduction tubing is the steel string run inside the casing through which oil, gas and condensate flow to surface. It is an OCTG (Oil Country Tubular Goods) product manufactured to API 5CT, supplied in outside diameters from 1.050" up