abstract:In oil drilling, a casing headSchumberger: Oilfield Glossary is a simple metal flange welded or screwed on to the top of the conductor pipe (also known as drive-pipe) or the casing and forms part of the wellhead system for the well.
Time for the third kind of closing well is so long that flangesteel ring groove on the top of casing-head is heavilycorrodedin M4 well being situated inTarimbasin.