INNRETNING FOR BRUK UNDER SEMENTERING AV EN FORINGSSTRENGI EN BROENNBORING.

摘要

There is disclosed apparatus either in the form of a float shoe or float collar for use in cementing a casing string within a well bore, the shoe or collar having blades extending longitudinally along the outer side thereof for centering the shoe or collar, and thus the lower end of the casing string, within the well bore.