Sealing arrangement, and corresponding method

Abstract

A sealing arrangement and method for dynamic sealing around a drill stem (50) in water-carrying, drilling fluid-carrying or hydrocarbon-carrying wells, comprising at least one dynamic sealing (35a) which is arranged to envelop the drill stem (50), and a receiver unit (30) arranged to receive the at least one sealing (35a), with the dynamic sealing being arranged to be driven into the receiver unit (30) with the help of the drill stem, and to be securely locked in the receiver unit, and also that internal pressure support in the sealing arrangement is provided corresponding to at least the surrounding pressure. The receiver unit (30) is arranged in an area in or near the drill deck of a drilling rig or vessel and in a riser, landing string or in another connection between drill deck and a well to close the return side of the drilling fluid between the drill stem and upper part of the riser, with the receiver unit (30), in connection with a floating rig or drilling ship, being arranged below the compensating unit (21) of the riser to make movement compensation possible between riser (20) and surface vessel (10), or that the receiver unit (30) in connection with a fixed installation, is arranged as a part of the riser connection (20).

Dependencies are inferred from the claim text.