The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 03, 2003
Filed:
Jun. 17, 1998
Ben Van Bilderbeek, London, GB;
Plexus Ocean Systems Limited, , GB;
Abstract
In the drilling of a well, a dedicated drilling wellhead ( ) mounted at the top of the casing cluster whilst the well is being drilled. At the end of drilling, a seal ring or sleeve ( ) which during the drilling phase has the function of an annular sleeve isolating the well bore pressure from the production annulus space ( ), is manipulated into an alternative position in which it acts to block the annular space ( ) thereby acting as a temporary abandonment seal. A further plug seal is fitted in the well bore. The well is now temporarily sealed and the drilling wellhead can then be removed and can be reused on another well during the drilling phase of that well. A production wellhead ( ) which has a cantilever christmas tree fitted on its side over a production wellhead ( ) which can accept a conventional christmas tree on top is then fitted on to the casing hanger cluster. Prior to installation of the tubing hanger the seal ring sleeve ( ) can be manipulated back into its upper position from where it seals the production annulus ( ) from the well bore while allowing monitoring of the production annulus ( ) through the outlet port ( ).