Offshore well drilling system with nested drilling risers
AssigneeCameron International Corporation
InventorsWilliam Puccio, David Cain, Vijay A. Cheruvu, Shian Jiun Chou
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Abstract
An offshore well system for a subsea well includes an internal riser tension device configured to apply tension to an internal riser and an external riser tension device configured to apply tension to an external riser such that the external riser is supported at least partially independent of the internal riser tension device.
Claims19
An offshore well system for supporting a tubular string positioned within a riser system including an internal riser and an external riser at a subsea well, the system comprising:
- an internal riser tension device configured to apply tension to the internal riser;
- and
- an external riser tension device configured to apply tension to the external riser such that the internal riser is able to extend from an upper end of the external riser when installed, wherein the external riser tension device is configured to be supported independent of the internal riser tension device and independent of a platform of the offshore well system.
A method for drilling a subsea well from a platform with a riser system including an internal riser and an external riser, the method comprising:
- tensioning the internal riser with an internal riser tension device;
- tensioning the external riser with an external riser tension device supported independent of the internal riser tension device and independent of the platform, such that only a portion of the internal riser is nested within the external riser;
- and
- drilling the subsea well with a tubular string positioned within the internal riser and the external riser under tension.
An offshore well system for supporting a tubular string positioned within a riser system including an internal riser and an external riser at a subsea well, the system comprising:
- an internal riser tension device configured to apply tension to the internal riser and;
- an external riser tension device configured to apply tension to the external riser such that only a portion of the internal riser is nested within the external riser when installed, wherein the external riser tension device is configured to be supported independent of the internal riser tension device and independent of a platform of the offshore well system.
Dependencies are inferred from the claim text.