Patent ID: 8985229
Filing Date: 2015-03-24
Classification: E21B

Abstract:
1. Method for dynamic sealing around a drill stem and an upper part of a riser in water-carrying, drilling fluid-carrying or hydrocarbon-carrying wells, having a sealing arrangement for a dynamic sealing comprising at least one dynamic seal placed to envelop the drill stem in the riser for closing a drilling fluid return side between the drill stem and the upper part of the riser, with an internal pressure support being provided in the sealing arrangement the method comprising assembling a receiver unit in the riser in which the receiver unit in connection with a floating rig or drilling ship, is arranged below a compensating unit of the riser; running the drill stem into the riser with a suspended sealing unit; entering and securely locking the sealing unit to the receiver unit which is mounted as a part of the connection to the well; running subsequent seals suspended on the drill stem without removal of the first installed seal, and securely locking said seals with the help of respective locking devices at mutually spaced apart locations longitudinally in the receiver unit; testing and verifying each seal with pressure testing; and injecting pressure medium through dedicated lines in the receiver unit to provide pressure support for the seals.