Patent ID: 6223825
Filing Date: 2001-05-01
Classification: E21B

Abstract:
A swivel device for installation at a well for subsea production of oil or gas and adapted to be connected to a production vessel at the sea surface, comprising:main fluid swivel having at least two passages, a central core member, and an auxiliary swivel,wherein the fluid swivel is provided with a rotatable swivel housing on top of a stationary christmas tree;wherein said passages are through-running vertically in said central core member of the fluid swivel, in order to make possible well intervention from the upper side of the fluid swivel;a force transferring housing at the lower part of the christmas tree, said force transferring housing being rotatably journalled about a common vertical axis on a base structure;a mooring yoke having two legs, the free ends of said legs are rotatably connected to at either side of said force transferring housing, and the opposite ends of said legs adapted to be attached to the end of a mooring line; anda mechanical coupling provided between said force transferring housing and said swivel housing for causing said swivel housing to perform the same rotary movements as said force transferring housing under the influence of said yoke.