Patent ID: 8066062
Filing Date: 2011-11-29
Classification: E21B,F16J

Abstract:
1. Sealing arrangement for dynamic sealing around a drill stem or coiled tubing, comprising an elongated, dynamic sealing unit which is arranged to surround the drill stem, in that the sealing unit comprises a number of sets of main seals arranged mutually spaced apart in the longitudinal direction of the sealing unit, where said main seals comprise at least one disc-formed or ring-formed packer element of an elastic material, arranged to surround said drill stem, wherein at least one of the main seals comprises at least one inlet channel arranged to inject a friction reducing medium directly into a seal surface of the packer element, against the drill stem and wherein said main seals comprise more than one disc-formed or ring-formed packer elements and said friction reducing medium is injected between said disc-formed or ring-formed packer elements.