Buoyant member riser tensioner method and apparatus

Patent · Tue Apr 14 04:00:00 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
• Country of Publication: United States
• Language: English

Related Subjects

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