WELLBORE PIPE CENTRALIZER HAVING INCREASED RESTORING FORCE AND SELF-SEALING CAPABILITY

摘要

A CENTRALIZER (10) INCLUDES A FIRST STOP COLLAR (40) CONFIGURED TO BE AFFIXED TO AN EXTERIOR SURFACE OF A PIPE (14). A SECOND STOP COLLAR (42) IS SPACED APART FROM THE FIRST STOP COLLAR (40) AND IS CONFIGURED TO BE AFFIXED TO THE EXTERIOR SURFACE OF THE PIPE (14). A PLURALITY OF CIRCUMFERENTIALLY SPACED APART LONGITUDINAL SPACERS (46) IS INCLUDED AND EACH IS COUPLED AT EACH LONGITUDINAL END TO ONE OF THE STOP COLLARS (40, 42). A FIRST PLURALITY OF CIRCUMFERENTIALLY SPACED APART BOW SPRINGS (52) IS EACH COUPLED AT ONE LONGITUDINAL END THEREOF TO THE FIRST STOP COLLAR (40) AND AT AN OPPOSITE LONGITUDINAL END THEREOF TO A FIRST FLOATING COLLAR (50) DISPOSED BETWEEN THE FIRST AND SECOND STOP COLLARS (40, 42). A SECOND PLURALITY OF CIRCUMFERENTIALLY SPACED APART BOW SPRINGS (52) IS EACH COUPLED AT ONE LONGITUDINAL END THEREOF TO THE SECOND STOP COLLAR (42) AND AT AN OPPOSITE LONGITUDINAL END THEREOF TO A SECOND FLOATING COLLAR (48) DISPOSED BETWEEN THE FIRST AND SECOND STOP COLLARS (40, 42).