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:
Feb. 16, 2021
Filed:
May. 24, 2017
Future Well Control As, Kristiansand, NO;
Dag Vavik, Kristiansand, NO;
Future Well Control AS, Kristiansand, NO;
Abstract
A method for managed pressure drilling comprising: extending a drilling riser with a drill string from a floating installation to a subsea blow-out preventer stack; providing a first fluid in the drilling riser annulus and a second fluid in a fluid conduit extending from the floating installation, where the first fluid has a higher density than the second fluid; circulating the second fluid through a control valve which is fluidly connected to the fluid conduit and operating the control valve to apply a surface back-pressure so as to obtain a pre-determined, desired combined hydrostatic and frictional circulation pressure below the subsea blow-out preventer stack.