Petroleo Brasileiro S.a. - Petrobras

Universidade Federal Do Rio Grande Do Sul-ufrgs

Petróbras Brasileiro S. A.—petrobras

Claudio Violante Ferreira

Bruno Pinho Dos Reis

Flavio Barroso De Mello

Gilnei Reckziegel

Ricardo Wagner Capllonch

Leonel Echer

Flávio Barroso De Mello

Jorge Gomes De Melo Medeiros

Rogério José Marczak

Francisco Francelino Ramos Neto

Jakson Manfredini Vassoler

The present invention comprises a structure with the same external geometry as a generic hook, but with a topology (internal structuring) that allows a greater distribution of deformation energy to all elements of the part, with load transfer to other less stressed regions. When the present invention is subjected to a loading, said flexible parts deform in a pre-specified manner, transferring part of a loading that would be excessive in a given region to another less loaded region, without any power supply or external interference. In this way, the deformation pattern that occurs in the present invention relieves stresses where they are greatest and, at the same time, provides flexibility (compliance), more adequately distributing coupling loads between the various fastening components.

Compliant component for supporting bend stiffeners

Disclosed is a mechanism for retracting the wedges of a rigid riser support, consisting of a cam holder crown, rods with rollers, a drive spindle, a hydraulic actuator and springs; this system can be driven by ROV or remotely. The system allows the reduction of the need for shallow diving and enables interconnections of rigid risers by keelhauling, promoting competitiveness with the flexible riser solution.

Rigid riser support automation

The present invention addresses to a system for supporting the tension load of the riser, this component with the primary function of supporting the risers, where the riser support mechanism is an integral part of the upper cone, thus eliminating the need to install slips by the shallow dive, and, also avoiding that the locking mechanism is an integral part of the Top Termination of the Riser (L). There is a minimal number of moving parts, which favors the maintainability of the system. In addition, if maintenance is required, the size and weight of the components are compatible with diving operations. For pull-in operations, it is anticipated that the slips will return to their working position only by the action of the force of gravity. In the case of pull-out, the concept of automated slip retraction mechanism was developed. A new Top Termination of the Riser (TTR) (L) geometry is also proposed, aiming at its simplification, in which, in addition to considering the locking mechanism as an integral part of the upper cone of the Support Pipe, there is the elimination of moving components for stabilization of its side movement (a function formerly performed by the locking ring or by the gap compensator).

Support for risers and method for coupling and uncoupling

The present invention provides a system for coupling between a bend stiffener () and a bell month () comprising a plurality of locking mechanisms (), wherein each locking mechanism () is secured externally to the bell mouth () and comprises a movable lug () positioned such as to slope downwards, in which the lug () accesses the interior of the bell mouth () and is actuated by an elastic element () designed to exert pressure on the lug () in the direction of the interior of the bell mouth ().

System for coupling between a bend stiffener and a bell mouth comprising a plurality of locking mechanisms

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Rio de Janeiro, Brazil

Claudio Violante Ferreira