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:
May. 08, 2018
Filed:
Oct. 24, 2012
Statoil Petroleum As, Stavanger, NO;
Ivar Kjøsnes, Trondheim, NO;
Nils Lennart Rolland, Nyborg, NO;
STATOIL PETROLEUM AS, Stavanger, NO;
Abstract
There is described a technique for drilling and controlling the fluid pressure of a borehole () during drilling of the borehole. In embodiments of the invention, drill pipe () may be arranged in said borehole, the pipe being configured to provide drilling fluid in the borehole. Sealing means () may be provided and arranged to sealingly abut an outer surface of the drill pipe to separate said drilling fluid in the borehole on a first side of the sealing means from a column of fluid on a second side of the sealing means. Furthermore, a subsea pump arrangement () may be arranged under a sea surface where it receives a flow of said drilling fluid from the borehole. The pump arrangement can operate to pump drilling fluid out of the pump arrangement, and generate a fluid pressure in said drilling fluid at a location upstream of the pump arrangement, said generated pressure being less than or equal to the hydrostatic pressure of said column of fluid on said second side of the sealing means.