Armco Inc.

Abb Vetco Gray Incorporated

Yung-sen Chou

Jeffrey Douglas Otten

Michael E Capesius

Sammy R Moore

A centralizing device is provided for a riser of an offshore well platform having a frame that defines an opening through which the riser passes from the platform to a subsea wellhead. The centralizing device has a centralizing ring with an inner diameter greater than the outer diameter of the riser so that the riser can be passed longitudinally therethrough. The centralizing ring is positioned within the opening of the frame. Adjustable mounting means are used for mounting the centralizing ring to the frame at different positions within the opening. A roller assembly of the centralizing device is carried upon the riser as the riser is lowered through the centralizing ring. The roller assembly is configured to engage the centralizing ring as the riser is lowered through the centralizing ring so that the centralizing ring stops further carriage of the roller assembly by the riser. The roller assembly has rollers mounted thereon that bear against an exterior of the riser to limit lateral movement of the riser but that allow longitudinal movement of the riser when the roller assembly is engaged with the centralizing ring.

Drilling riser centralizer

Preloaded connection for supporting an annular body from an annular suspension joint. The connection includes an actuating ring, a split locking ring and a retaining nut which are positioned between the annular body and suspension joint. The connection is preloaded by applying an axial force to the actuating ring causing the locking ring to be expanded outwardly with the annular body becoming preloaded in compression and the suspension joint preloaded in tension with the preload force passing through the mating surfaces.

Growing community of inventors

Houston, TX, United States of America

Yung-sen Chou