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once the surface section of the well is drilled the drill pipe is pulled out of the hole in order to lay the casing this is done for environmental reasons to hydraulically seal the formation layers containing aquifers from the flowing hydrocarbons later on once the well is completed the casing string is made of numerous joints the same size screwed together at the collar the casing pipe is selected ing to its outer diameter its wall thickness its length its weight by unit length and the grade of steel it is made of the selection of grade of casing depends on several variables including the size of the hole the rigosity of the drilled hole the expected pressure of the flowing hydrocarbons the h2s content as well as the economic considerations once the entire weight of the casing string is solely suspended by the hangers the casing is considered laid in place in order to secure the laid casing string to the formation cement is pumped through the casing shoe at the bottom of the w