Buoyant member riser tensioner method and apparatus

Patent · Tue Apr 14 00:00:00 EDT 1987

OSTI ID:6469377

Petersen, W H

A method is described of supporting the weight of an elongated vertical marine riser in a body of water by use of a buoyant member having a vertical slot defined longitudinally therethrough. The buoyant member positioned within a vertical opening is defined through a floating platform and is capable of vertical movement therein. The floating platform is provided with: riser assembly and support means for assembly of the riser and support of the weight of the riser, and buoyancy adjustment means for adjustment of the buoyancy of the buoyant member by the addition to and removal of buoyancy means from the buoyant member, the marine riser provided with: connection means at its lower end for connection of the lower end to subsea equipment fixedly anchored to the seafloor of the body of water, and landing shoulder means connected to the upper portion of the riser having an outer dimension greater than the width of the vertical slot of the buoyant member.

• Assignee: Shell Offshore Inc., Houston, TX
• Patent Number(s): US 4657439
• OSTI ID: 6469377
• Resource Relation: Patent File Date: Filed date 18 Dec 1985
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
03 NATURAL GAS
42 ENGINEERING
MARINE RISERS
BUOYS
SUPPORTS
NATURAL GAS WELLS
OIL WELLS
CONNECTORS
OFFSHORE PLATFORMS
POSITIONING
SEA BED
UNDERWATER OPERATIONS
CONDUCTOR DEVICES
ELECTRICAL EQUIPMENT
EQUIPMENT
MECHANICAL STRUCTURES
PIPES
WELLS
020300* - Petroleum- Drilling & Production
030300 - Natural Gas- Drilling
Production
& Processing
423000 - Engineering- Marine Engineering- (1980-)