Aluminum-alloy riser extends driller's reach into deeper water

Operating at water depth of 3,040 ft offshore Brazil, the Noble Leo Segerius was the first drillship to deploy the new aluminum-alloy drilling risers. These risers are rated for use at water depths in excess of 5,000 ft (Fig. 1)Drilling off Brazil has confirmed that a newly developed aluminum-alloy riser allows existing drilling rigs to drill in greater water depths without incurring extensive rig modification costs.Noble Corp. successfully deployed the first string of aluminum-alloy riser in January 2003 from the Noble Leo Segerius drilling vessel (Fig. 1), operating in 3,040 ft of water off Brazil. Since then, five additional wells drilled off Brazil have used the riser.The new riser is...

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