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:
Aug. 07, 2012
Filed:
Sep. 14, 2006
Øyvind Stokka, Sandnes, NO;
Helge Krohn, Sandnes, NO;
Øyvind Stokka, Sandnes, NO;
Helge Krohn, Sandnes, NO;
Schlumberger Norge AS, Stavanger, NO;
Abstract
The invention comprises a sealing body () separating device) which can be used to separate fluids in risers used in offshore oil production from drilling vessels at the sea surface. The invention is characterized in that the sealing body () can be placed in position above the wellhead () using several appropriate methods and, in an especially preferred application, by utilizing an installation tool () which is not sealing against the inner wall of the riser and which contains a suitable positioning means (), and that the body () which forms a seal against the inner wall of the riser separates fluids during the replacement of drilling fluid with water and of water with drilling fluid. The body () can be displaced using hydraulic force upwards in the longitudinal direction of the riser in that fluid is pumped at a relatively high pressure down the externally located smaller pipes () of the riser. The body can be used while the drilling vessel () heaves relative to the seabed (), and it is independent of the drilling vessel's drawers for the drill string () while the fluid is being replaced.