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  • curprev 17:01, 22 April 2015‎ Molyneux talk contribs‎ 250 bytes +250‎ A well is not drilled all the way through. Metal casing strings are run to isolate specific sections of the hole before drilling further. From Shepherd, M., 2009, Drilling a well, in M. Shepherd, Oil field production geology: AAPG Memoir 91, p. 7-12.
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